Air Conditioning (coupe) (1 of 2) Audi A5 I

A/C AND REFRIGERANT SAFETY PRECAUTIONS

The assemblies and piping system of the air conditioner are filled with the following refrigerant

1.1.1.2 Tetrafluorethane (CF 3 -CH 2 F or CH 2 F-CF 3 )

Currently, this refrigerant is known under the following trade names R134a, H-FKW 134a, SUVA 134a and KLEA 134a (other trade names may be used in other countries).

1. Safety Precautions for handling refrigerant, refer to «SAFETY PRECAUTIONS WHEN HANDLING REFRIGERANT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__safety-precautions-when-handling-refrigerant) .
2. Safety Precautions when working on vehicles with Start/Stop System, refer to «SAFETY PRECAUTIONS WHEN WORKING ON VEHICLES WITH START/STOP SYSTEM»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__safety-precautions-when-working-on-vehicles) .
3. Discharge refrigerant circuit, refer to «REFRIGERANT CIRCUIT DRAINING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__refrigerant-circuit-draining) .
4. Working on refrigerant circuit. Refer to «WORKING ON THE REFRIGERANT CIRCUIT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__working-on-the-refrigerant-circuit) .
5. Painting vehicles with A/C, refer to «PAINTING ON VEHICLES WITH AIR CONDITIONING SYSTEM»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__painting-on-vehicles-with-air-conditioning) .
6. A/C System, additional information, refer to «GENERAL REPAIR INFORMATION»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__general-repair-information) .

SAFETY PRECAUTIONS WHEN HANDLING REFRIGERANT

The following safety measures should be observed for this refrigerant (additional guidelines apply in individual countries).

If it is necessary to open the refrigerant circuit during service work, discharge the refrigerant circuit first. Refer to REFRIGERANT CIRCUIT DRAINING . In doing so, the utmost care is to be taken to avoid contact with liquid refrigerant or refrigerant vapors. Should refrigerant escape, avoid inhaling the resultant refrigerant/air mixture.

Extraction - exhaust system is to be switched on and use both rubber gloves and protective goggles.

Reason

Intensive exposure to refrigerant on unprotected parts of the body will result in frostbite.

Should refrigerant come into contact with other parts of the body despite compliance with all the pertinent safety measures, these are similarly to be rinsed thoroughly in cold water without delay for at least 15 minutes.

Although refrigerant does not represent a fire hazard, smoking, welding, soldering and brazing are not permitted in areas exposed to refrigerant.

Reason

The high temperature of a naked flame or hot objects causes decomposition of refrigerant gas. Inhalation of the resultant toxic decomposition products leads to dry coughing and nausea.

SAFETY PRECAUTIONS WHEN WORKING ON VEHICLES WITH START/STOP SYSTEM

GENERAL REPAIR INFORMATION

1. Appropriate current flow diagrams can be found in appropriate SYSTEM WIRING DIAGRAM.
2. A data plate in engine compartment indicates the refrigerant used and capacity.
3. Additional information for repairs on vehicles with an A/C system and for handling refrigerant can be found in «General Information»(/audi/a5/i-2007-2011/remont/general-servicing-all-makes/#general-technical-data-refrigerant-r134a-servicing-coupe-1-of-2__general-information) .

Vehicles with a high voltage system (Hybrid vehicles)

Read and follow all of the supplemental warnings for all work performed on vehicles with the high voltage system. Refer to HIGH VOLTAGE SYSTEM (HYBRID VEHICLES) REPAIRS .

Vehicles with Start/Stop System

All Vehicles

Note. Disconnect the battery -A-, the auxiliary battery -A1- and the traction battery -A2- before starting any electric welding on the vehicle. Refer to Removal and Installation .

The A/C refrigerant system may be drained and opened only if it is for safety reasons, refer to A/C AND REFRIGERANT SAFETY PRECAUTIONS or if components of the A/C refrigerant system must be replaced, refer to REFRIGERANT CIRCUIT DRAINING .

When performing all other usual vehicle repair work, the refrigerant circuit of the A/C system should remain closed.

Repairs to the heating and A/C without opening the refrigerant circuit are possible and are described in REFRIGERANT CIRCUIT COMPONENT OVERVIEW or REFRIGERANT CIRCUIT COMPONENT OVERVIEW , A/C SYSTEM CONTROL AND REGULATION COMPONENTS OUTSIDE PASSENGER COMPARTMENT and A/C SYSTEM CONTROL AND REGULATION COMPONENTS INSIDE PASSENGER COMPARTMENT .

Note. The connections for the senders/switches described in this Workshop Information are fitted with a valve which closes automatically when the switches are unscrewed. These switches can thus be replaced in any Audi and Volkswagen workshop even though the refrigerant circuit is fully charged.

Service work on the A/C system that requires the refrigerant circuit to be discharged and thus cannot be performed in every Audi and Volkswagen workshop are described in REFRIGERANT CIRCUIT, SERVICING . Certain tools are required to discharge the refrigerant circuit. These work procedures must only be performed by trained personnel as well. Therefore, bring vehicle to a workshop that has the necessary tools and in which the work can be performed accordingly by qualified personnel if necessary. Refer to General Information => Refrigerant R134a Servicing.

1. Contact corrosion, refer to «CONTACT CORROSION»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__contact-corrosion) .
2. A/C components controlled or activated by other control modules, electrical tests, refer to «A/C COMPONENTS CONTROLLED OR ACTIVATED BY OTHER CONTROL MODULES, ELECTRICAL TESTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__ac-components-controlled-or-activated-by) .
3. Components actuated by A/C system, electrical test, refer to «COMPONENTS ACTUATED BY A/C SYSTEM, ELECTRICAL TEST»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__components-actuated-by-ac-system-electrical) .

HIGH VOLTAGE SYSTEM (HYBRID VEHICLES) REPAIRS

Disable The High Voltage System

Note. Disable the high voltage system Connect the vehicle diagnostic tester Select the Guided Fault Finding mode Using the GO TO button, select the following menu commands Functions/Component selection Body Electrical Equipment OBD-capable system 8C - Hybrid battery management -J840 8C - Hybrid battery management, functions 51 - Disable the high voltage system (Rep.Gr. 93)

1. Before beginning work on the high voltage system, a high voltage technician must disable the high voltage system, refer to Disable the high voltage system see above. .
2. Use the respective processes for work performed on the high voltage system, for which the system is required to be switched on. For further information about the high voltage system, refer to «HIGH VOLTAGE SYSTEM (HYBRID VEHICLES) REPAIRS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__high-voltage-system-hybrid-vehicles-repairs) .

Note. Disable the high voltage system before beginning work, for all work performed on components of the hybrid vehicle which are connected to the high voltage system (such as the electrically powered A/C compressor). Work performed on the A/C System, which is not directly affected by the high voltage system (such as performing a pressure test on the refrigerant circuit, Guided Fault Finding for the A/C system or for the A/C compressor control module -J842- etc.), must only be performed by electrically trained personal. Refer to HIGH VOLTAGE SYSTEM (HYBRID VEHICLES) REPAIRS and Vehicle Diagnostic Tester with Function "Guided Fault Finding" for A/C System and Battery Control. Disable the high voltage system before beginning work on specific components of the hybrid vehicles, which are located in the vicinity of components belonging to the high voltage system (such as on the battery cooling module, on the expansion valve for the A/C system for the Audi Q5 etc.). Refer to HIGH VOLTAGE SYSTEM (HYBRID VEHICLES) REPAIRS .

Restart The High Voltage System

Note. Restart the high voltage system: Connect the vehicle diagnostic tester Select the Guided Fault Finding mode Using the GO TO button, select the following menu commands Functions/Component selection Body Electrical Equipment OBD-capable system 8C - Hybrid battery management -J840 8C - Hybrid battery management, functions 51 - High voltage restart (Rep.Gr. 93)

Working on a high voltage system when activated or with the ignition turned on

Working on vehicles with a high voltage system

1. If it is necessary to perform work in the vicinity of high voltage components, perform a visual inspection of the high voltage components and cables for damages. Refer to «VISUAL INSPECTION OF HIGH-VOLTAGE COMPONENTS AND CABLES FOR DAMAGE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__visual-inspection-of-high-voltage-components-and) .
2. If it is necessary to perform work on the high voltage components, disable the high voltage system. Refer to disable the high voltage system see above. and read and follow the high voltage electrical system general warnings.
3. Charge the vehicle battery using, for example, the VAS 5903 in the battery support mode to minimize the number of automatic starts during the test- and measuring procedures while the ready mode is active. Refer to «[For engine(s) CAUA, CAEB, CALA] General Information»(/audi/a5/i-2007-2011/remont/charging-system/#battery-starter-generator-cruise-control-coupe) .
4. Move the selector level into position "P", activate the parking brake and arrange the necessary tools for testing and measuring procedures that require the ready mode to be active or that require the ignition to be on, so that they cannot come into contact with the turning components in the engine and so that they are not in the vicinity of the turning components of a running engine.

Note. Also move the selector lever into position "P" and activate the parking brake for testing and measuring procedures which require the ignition to be on, but do not require the ready mode to be active. The ready mode is displayed in the instrument cluster control module -J285- above the "powermeter". Refer to the Owners Information. Activate and deactivate the ready mode. Refer to the Owners Information (consult the display in the instrument cluster control module -J285-).

A/C SYSTEM, OPERATING AFTER FILLING REFRIGERANT CIRCUIT

With high voltage systems (hybrid vehicles)

Read and follow all of the supplemental warnings for all work performed on vehicles with the high voltage system, refer to HIGH VOLTAGE SYSTEM (HYBRID VEHICLES) REPAIRS .

If it is necessary for the following procedure to perform work in the vicinity of high voltage components, perform a visual inspection of the high voltage components and cables for damages, refer to VISUAL INSPECTION OF HIGH-VOLTAGE COMPONENTS AND CABLES FOR DAMAGE .

1. All removed parts are installed.
2. The refrigerant circuit is filled. Refer to A/C Service Station in «Description and Operation»(/audi/a5/i-2007-2011/remont/general-servicing-all-makes/#general-technical-data-refrigerant-r134a-servicing-coupe-1-of-2) .

Switch on the ignition.

Check the Climatronic control module -J255- display and control head DTC memory and erase any displayed malfunctions if necessary. Refer to Vehicle Diagnostic Tester under "Guided Fault Finding".

Operate the electric A/C compressor -V470- using the function "Compressor Cut-In". Refer to Vehicle Diagnostic Tester in the "Guided Fault Finding" Function for the A/C System and Battery Control.

Note. Note the information regarding operating the A/C system after filling. Refer to A/C Service Station in Description and Operation .

Without a high voltage system

Note. Only start engine after refrigerant circuit has been assembled. If possible, start engine only with a filled refrigerant circuit. Do not start the engine while evacuating the refrigerant circuit or when the circuit is already evacuated (the A/C compressor could be damaged). Refer to Description and Operation . The A/C compressor without an A/C clutch -N25- is always driven when the engine is running. If the vehicle has an A/C compressor without an A/C clutch, then the vehicle may only be started when the refrigerant circuit has been properly assembled. For example; if the refrigerant lines are not connected to A/C compressor, when the engine is running the A/C compressor may heat up (via internal heat generation) so much that the A/C compressor will be damaged. Such internal heat generation results from the fact that - even with delivery near 0% - the compressor is operating with a fixed resistance (sealed circuit). An A/C compressor with an A/C clutch is installed as a running change on certain 4-cylinder vehicles from MY 12. Refer to BELT PULLEY WITH A/C CLUTCH -N25- OVERVIEW . The A/C clutch turns off the A/C compressor drive completely under certain conditions (for example "ECON"). The correct Climatronic control module -J255- must be installed and it must be coded correctly so that the Climatronic control module display and control unit can control the A/C clutch. The A/C compressor without an A/C clutch is always driven by the belt pulley or driveshaft. To prevent damage when the compressor is idling, it is lubricated by an "internal oil circuit". The compressor has an "internal oil circuit" to ensure the A/C compressor is not damaged when refrigerant circuit is empty. Prerequisite for the internal lubrication is residual refrigerant oil in A/C compressor. A/C Compressor Regulator Valve -N280- is not activated when the refrigerant circuit is empty and the A/C compressor idles with the engine. As there is no refrigerant in the circuit the oil required to lubricate is not fed to the A/C compressor.

1. All removed parts are installed.
2. The refrigerant circuit is filled. Refer to «Description and Operation»(/audi/a5/i-2007-2011/remont/general-servicing-all-makes/#general-technical-data-refrigerant-r134a-servicing-coupe-1-of-2) .

If it is necessary to start the engine with a discharged refrigerant circuit

1. Refrigerant circuit must be fully assembled.
2. There must be no vacuum in the refrigerant circuit.
3. At least 1/4 of the prescribed refrigerant oil must be in the A/C compressor.
4. Do not rev engine higher than 2500 rpm.
5. The engine should only run as long as is absolutely necessary.

Note the following when starting engine for first time after filling refrigerant circuit

Switch on the ignition.

Check the Climatronic control module -J255- display and control head DTC memory and erase any displayed malfunctions if necessary. Refer to Vehicle Diagnostic Tester under "Guided Fault Finding".

Start engine with the A/C compressor switched off ("Econ" operating mode set, indicator light in AC button does not light up), and wait until engine idle speed has stabilized.

Open all instrument panel vents.

Set the temperature preset on the A/C Control Head Climatronic Control Module -J255- to "cold" (for the driver and passenger side).

Press the AC button to switch on the A/C compressor ("Auto" mode selected and the indicator light in the AC button is on) and let the engine and A/C compressor idle for at least 5 minutes.

Note. Note the information regarding operating the A/C system after filling. Refer to A/C Service Station in Description and Operation .

A/C COMPRESSOR

Note. Depending on time period of production and on engine, compressor construction type may vary. Refer to REFRIGERANT CIRCUIT COMPONENT OVERVIEW For vehicles with 6 cylinder and 8 cylinder FSI engine, the A/C compressor may be dismantled and removed from the bracket only when the refrigerant circuit is emptied and open. Refer to COMPRESSOR . At start of production, vehicles without a high voltage system have A/C compressors manufactured by "Denso" (type "6 SEU 14" on vehicles with a 4-cylinder or 6-cylinder engine, and type "7 SEU 17" on vehicles with an 8-cylinder engine). Compressors from other manufacturers may also be installed at a later time. Refer to Specifications . These A/C compressors are available as replacement parts with different oil fill capacities, therefore note capacity on A/C compressor. Refer to Specifications and the exact part number. Depending on A/C compressor type, different refrigerant oil fill capacities are designated for the refrigerant circuit. The reason for the different oil capacities in the A/C compressor for an otherwise identical refrigerant circuit lies in the design of the A/C compressor itself, note these oil capacities. Too much oil in the circuit leads to higher pressures and reduces cooling performance of the system. Too little oil may lead to lubrication problems in the compressor. If a new mechanically-driven compressor has been installed or new refrigerant oil has been put into these A/C compressors (for example, after flushing refrigerant circuit), the A/C compressor must be turned by hand approximately 10 turns. This ensures that the A/C compressor is not damaged when activated. Refer to A/C Service Station in Description and Operation . After installing a new electrically-driven A/C compressor (electrical A/C compressor -V470-) or filling new refrigerant oil. Operate this A/C compressor using "compressor cut-in" in "Guided Fault Finding". Refer to Vehicle Diagnostic Tester in A/C system and Battery Control.

1. Mechanically-Driven A/C compressor, removing and installing, 4 cylinder engine, refer to «A/C COMPRESSOR»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__ac-compressor-engine-codes-caeb) .
2. Electrically-Driven A/C compressor, removing and installing, 4 cylinder engine, refer to «ELECTRIC A/C COMPRESSOR»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__electric-ac-compressor) .
3. A/C Compressor, removing and installing, 6 cylinder, refer to «A/C COMPRESSOR»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) .
4. A/C Compressor, removing and installing, 8 cylinder engine, refer to RS «A/C COMPRESSOR»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__ac-compressor-engine-codes-caua) or RS5 «A/C COMPRESSOR»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__ac-compressor-engine-codes-cfsa) .

A/C SYSTEM CONTROL AND REGULATION COMPONENTS INSIDE PASSENGER COMPARTMENT

Note. If there is a malfunction in the A/C system, first check the memory of the A/C Control Head Climatronic Control Module -J255- heater control head DTC memory using the Vehicle Diagnostic Tester in "Guided Fault Finding" function. If a different control unit displays a message to read the DTC memory, read the DTC memory on this control unit (for example, the vehicle electrical system control module -J519-, the Comfort System Central Control Module -J393-); certain components of the A/C system (for example, the compressor regulator valve -N280-, the A/C Pressure/Temperature Sensor -G395-) are no longer activated directly by the Climatronic control module display and control head and their measuring values are no longer evaluated directly by the Climatronic control module display and control head. If no fault is displayed, then read the measured value block for the Climatronic control module display and control head, and test the component using the "control diagnosis" of the Vehicle Diagnostic Tester in "Guided Fault Finding" function. The function "electrical testing" is not described in this Repair Information. Perform electrical testing via "Guided Fault Finding" function. Here notes can also be found on the functions which should be tested using the Vehicle Diagnostic Tester in "Guided Fault Finding" function. Temperature-dependent resistance values of the various temperature sensors are stored in one table. These can be called up via the "Guided Fault Finding" function in the Vehicle Diagnostic Tester. Electrical checking of the various control motors is described in the guided fault-finding using the Vehicle Diagnostic Tester in "Guided Fault Finding" function. Servicing operations on refrigerant circuit are described in REFRIGERANT CIRCUIT, SERVICING .

1. Perform the following work using the Vehicle Diagnostic Tester in "Guided Fault Finding" function

Check DTC memory of Climatronic Control Module -J255- A/C control head and erase any malfunctions displayed.

Check the coding of the front control and display unit Climatronic Control Module.

Check the adaptation of the front control and display unit Climatronic Control Module.

Perform a basic setting on the A/C system.

1. Components inside the passenger compartment, refer to «COMPONENTS INSIDE PASSENGER COMPARTMENT OVERVIEW»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2) .

A/C SYSTEM CONTROL AND REGULATION COMPONENTS OUTSIDE PASSENGER COMPARTMENT

All Vehicles

Note. If there is a malfunction in the A/C system, first check the memory of the A/C Control Head Climatronic Control Module -J255- heater control head DTC memory Vehicle Diagnostic Tester in "Guided Fault Finding" function. If a different control unit displays a message to read the DTC memory, read the DTC memory on this control unit (for example, the vehicle electrical system control module -J519-, the Comfort System Central Control Module -J393-); certain components of the A/C system (for example, the compressor regulator valve -N280-, the A/C Pressure/Temperature Sensor -G395-) are no longer activated directly by the Climatronic control module display and control head and their measuring values are no longer evaluated directly by the Climatronic control module. If no fault is displayed, then read the measured value block for the Climatronic control module, and test the component using the "control diagnosis" of the Vehicle Diagnostic Tester in "Guided Fault Finding" function The function "electrical testing" is not described in this Repair Information. Perform electrical testing via "Guided Fault Finding" function. Here notes can also be found on the functions which should be tested using the Vehicle Diagnostic Tester in "Guided Fault Finding" function. Temperature-dependent resistance values of the various temperature sensors are stored in one table, these can be called up via the "Guided Fault Finding" function of the Vehicle Diagnostic Tester in "Guided Fault Finding". The electrical test of the different control motors is described in Guided Fault Finding using the Vehicle Diagnostic Tester in "Guided Fault Finding" function. Servicing operations on refrigerant circuit are described in REFRIGERANT CIRCUIT, SERVICING .

1. Perform the following work after completion of repair operations

Check the Climatronic control module -J255- DTC memory and erase any displayed malfunction if necessary using the Vehicle Diagnostic Tester in "Guided Fault Finding" function.

Coding of Climatronic Control Module A/C control head was checked using the Vehicle Diagnostic Tester in "Guided Fault Finding" function.

Adaptation of the Climatronic Control Module was checked using the Vehicle Diagnostic Tester in "Guided Fault Finding" function.

Perform a basic setting on the A/C system using the Vehicle Diagnostic Tester in "Guided Fault Finding" function.

Note. Coolant hoses from connections to A/C unit heater core, removing and installing, refer to HEATER CORE/HOUSINGS A/C unit heater core connection in engine coolant circuit, refer to [For engine(s) CAUA] Description and Operation or to [For engine(s) CAEB] Description and Operation or to [For engine(s) CALA] Description and Operation . Depending on vehicle production period, connection points may be installed in refrigerant lines on certain versions (not planned at this time, introduction not yet finalized). As with connections on various components, these connection points may only be loosened and opened when the refrigerant circuit is empty. Refer to REFRIGERANT CIRCUIT, SERVICING and Description and Operation . For vehicles with 6 cylinders and other engines with certain optional equipment (such as vehicles with the Start/Stop system) but without an "auxiliary heater" have a coolant pump -V50- (a water pump -V36-). Refer to COOLANT PUMP and [For engine(s) CAUA] Description and Operation or to [For engine(s) CAEB] Description and Operation or to [For engine(s) CALA] Description and Operation . Depending on the version of the Climatronic control module -J255- A/C control head, coolant pump -V50- may be referred to as water pump -V36- in Guided Fault Finding. Refer to the Vehicle Diagnostic Tester in "Guided Fault Finding" function. The coolant pump -V50- (water pump -V36-) versions and activation differ depending on the version of the vehicle and production period. From MY 12 beginning with start of production, pumps that were controlled by a 500 Hertz signal (500 pulses per second) are being replaced by pumps that are controlled by a 100 Hertz signal depending on the engine. Pumps, controlled by a 100 Hertz signal, also have a diagnostic function and are controlled by the engine control module. Check for the correct allocation; refer to the Vehicle Diagnostic Tester in "Guided Fault Finding" function, appropriate SYSTEM WIRING DIAGRAM.

Hybrid Vehicles

Read and follow all of the supplemental warnings for all work performed on vehicles with the high voltage system. Refer to HIGH VOLTAGE SYSTEM (HYBRID VEHICLES) REPAIRS

1. Components for vehicles with or without a high voltage system which are the same. Refer to «COMPONENTS OUTSIDE OF VEHICLE INTERIOR (ALL VEHICLES)»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2) .

AIR QUALITY SENSOR -G238- AND HUMIDITY SENSOR IN FRESH AIR INTAKE DUCT -G657- FUNCTION

Note. There are different versions depending on the vehicle date of manufacture and which A/C system ("Basis" or "Comfort") is installed. The "Basis" A/C system does not have a humidity sensor in fresh air intake duct / air quality sensor until the MY 12 change-over. From MY 12 it has a humidity sensor in fresh air intake duct without an air quality sensor (black housing). Through MY 12, the "Comfort" A/C system has an air quality sensor without a humidity sensor in fresh air intake duct. From MY 12, it has a humidity sensor in fresh air intake duct with an air quality sensor, (brown housing). Only vehicles with the "Comfort" A/C system have an without a humidity sensor in fresh air intake duct (from start of production up the change-over) Beginning with the MY 12 Audi A4 and Audi A5, the vehicle version was changed-over as a running change. Refer to CLIMATRONIC CONTROL MODULE -J255- A/C CONTROL HEAD ALLOCATION . Vehicles, built before the change-over and with the "Comfort" A/C system, have an air quality sensor (not on the "Basis"). Vehicles built since this change-over (and on the Audi Q5 Hybrid): if the vehicle has the "Basis" A/C system, then it has a humidity sensor in fresh air intake duct; if the vehicle has the "Comfort" A/C system, then it has a humidity sensor in fresh air intake duct and an air quality sensor. This is how to tell the difference: the humidity sensor in fresh air intake duct with an air quality sensor has a brown housing (running change from MY 12). The humidity sensor in fresh air intake duct with an air quality sensor has a black housing (running change from MY 12). The air quality sensor without the humidity sensor in fresh air intake duct has a black housing and the humidity sensor is fresh air intake duct -3- is not there (discontinued as a running change from MY 12).

Air Quality Sensor Function -G238

1. There are different versions of the air quality sensor -2-. This vehicle has an air quality sensor that determines the NOx portion (nitrogen) and CO portion (carbon monoxide) of the air flowing by via a sensor. In addition, the air quality sensor exchanges information with the vehicle electrical system control module -J519- via a local Data bus.
2. The vehicle electrical system control module -J519- measures the value from the air quality sensor -1- and transmits it to the Climatronic control module -J255- via the Data bus. The Climatronic control module switches to recirculating air mode when requested, if there are no shut-off conditions present using the Vehicle Diagnostic Tester under "Guided Fault Finding".
3. The air quality sensor needs about 2 minutes to reach its operating temperature after the ignition is switched on. During the warm-up phase, the function of the air quality sensor is limited.
4. During the warm-up phase, air quality sensor malfunctions may occur under certain ambient conditions. Replace the air quality sensor only if it is registered continually as faulty. If the malfunction display for the air quality sensor changes from "static" to "sporadic" after turning off the ignition, waiting 2 minutes and then turning it back on, then the air quality sensor is OK and it is no longer necessary to observe the DTC memory. Refer to the Vehicle Diagnostic Tester in "Guided Fault Finding".
5. The air quality sensor recognizes the pollutants in the surrounding air (mostly gasoline and/or diesel exhaust gases) and switches the Climatronic control module to recirculating air mode.
6. The Climatronic control module recognizes the type and intensity of the air pollutant on the signal from the sensor. The Climatronic control module display and control head then makes the decision based on the outside air temperature and the intensity of the air pollutant. Check using the Vehicle Diagnostic Tester under "Guided Fault Finding".

If there is already a slight increase in the pollutant concentration in the air, the air quality sensor requests to switch on the recirculating air mode when the outside air temperature goes above +2 °C (35°F).

If the outside air temperature goes below -1 °C (30 °F) and in "ECON mode" (the A/C compressor is switched off and the indicator lamp in the button is off) the switch-over takes place first when there is a sharp increase in the pollutant concentration and only for 15 seconds. If there is another increase in the pollutant concentration within another 2 minutes, then the Climatronic control module does not switch into the "recirculating air mode".

If the A/C compressor is off (for example, "ECON" is on and the indicator lamp in the AC button is off), the Climatronic control module) A/C control head will limit the time the "recirculating air mode" is on to 15 seconds (so that the windows do not fog up).

If the concentration decreases, the air conditioner switches to the fresh air mode.

The duration of the "automatic recirculating air mode" depends on the version of the Climatronic control module display and control head. If the outside air temperature is below +10 °C (50 °F), then the system will stay on for approximately 30 seconds in "automatic recirculating air". After this, it switches back to fresh air mode. If, within 2 minutes, an increase in the pollutant concentration occurs, the Climatronic control module does not switch over to "automatic recirculating air mode" during this time.

1. "Automatic recirculating air mode" can be switched off at any time. If the function is active, the A/C compressor is switched on with a request for "automatic recirculating air mode" and also when the outside air temperature is below +2 °C (35 °F). If the temperature is below -5 °C (23 °F), then it is not possible to use the A/C compressor.
2. If "automatic recirculating air mode" is selected in MMI (Multi Media Interface), then the A/C compressor can be switched on by manually switching on recirculating air mode (using the "air recirculation button") down to -5 °C (23 °F).
3. To ensure that the A/C does not operate constantly in the recirculating air mode in areas with a consistently higher pollution, the Air Quality Sensor is self learning (it adjusts its sensitivity to the environmental conditions).
4. If outside air pollution load remains high for longer period of time, the Air Quality Sensor starts to adapt itself to the changing environmental condition through an adaptation program (learning program), the air recirculation request in evenly polluted ambient air is therefore generally shorter than 12 minutes. If a succession of peaks in the polluted air is detected, the air conditioning system can operate over a longer period of time in recirculated air mode.
5. A certain amount of time is required for repositioning of the air conditioning system doors. In the event that a sudden increase in pollutants is encountered (for example, when driving through a diesel exhaust cloud) gaseous pollutants can be taken in with the fresh air into the passenger compartment until the door can be closed. For this reason, on vehicles equipped with a Air Quality Sensor a dust and pollen filter is installed with a charcoal layer. A filter that is saturated with pollutants is no longer effective and needs to be replaced.
6. In order to avoid frequent shifting of the fresh /recirculating air doors, a slight increase of pollutants in the ambient air will not allow for immediate shifting (the Air Quality Sensor does not send a request to the Climatronic Control Module). The filtering of the charcoal insert in the dust and pollen filter will be sufficient.
7. In order to avoid frequent shifting of the recirculated air/fresh air doors and the recirculation doors, the requirement from the air quality sensor for "Automatic air recirculation" mode remains for at least 25 seconds (minimum duration period), even if the pollutant concentration is so far reduced that recirculated air mode is no longer necessary.
8. So that fogged windows are cleared as quickly as possible, Climatronic control module does not allow air recirculation when "Defrost" is on (a request from the Air Quality Sensor is not processed).
9. After the ignition is switched on, air quality sensor requires approximately 30 seconds to be operational (warm-up time). During this time there is no request from the air quality sensor to the Climatronic control module display and control head for "automatic recirculating air mode".
10. The air quality sensor contains a highly sensitive electronic component which can be damaged if it comes in direct contact with solvents, fuels or chemicals. For this reason, do not install sensors that may have come into contact with these substances.
11. Under certain ambient influences, when switching on the ignition (for example, when the air pollution is high), if a fault on the air quality sensor is stored in the vehicle electrical system control module -J519- during the air quality sensor warm-up time, even though the sensor is OK, proceed as follows

Switch off the ignition for minimum 2 minutes.

Switch on the ignition and wait minimum 2 minutes

Read the DTC memory for the vehicle electrical system control module -J519-. If the air quality sensor still displays a static malfunction. Perform Guided Fault Finding using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function. If the air quality sensor is no longer displayed as a malfunction or the malfunction is sporadic, then the air quality sensor is OK and does no longs needs to be observed. Erase the DTC memory.

Humidity sensor in fresh air intake duct function button -G657

Scheme 242

1. The humidity sensor in fresh air intake duct -3- and the air quality sensor -1- are installed in the same housing -2- (housing color "brown") on vehicles with the "Comfort" A/C system.
2. If the vehicle has the "Basis" A/C system, then only the humidity sensor in fresh air intake duct -3- is there. The air quality sensor -1- is not installed in the housing -2- (housing color "black").
3. The humidity sensor in the fresh air intake duct is a highly sensitive electronic component that can be damaged if it comes in direct contact with fluids, solvents, fuels and certain chemical compounds.
4. The function of the humidity sensor in the fresh air intake duct can be severely affected by direct contact with water so that correct moisture values can no longer be measured (briefly or permanently depending on the composition of the fluid). For this reason, do not install sensors that may have come into contact with these substances.
5. The humidity sensor in the fresh air intake duct determines the temperature and the moisture in the flowing air and exchanges the information with the vehicle electrical system control module -J519- via the Data bus.
6. The measured value for the humidity sensor in the fresh air intake duct is taken from the vehicle electrical system control module and transferred via the Data bus to the Climatronic control module -J255- control head.
7. The Climatronic control module uses the measured values to calculate the current relative humidity of the drawn-in fresh air. The calculated humidity value is used to detect whether there is a risk of the windshield, rear window, and door windows fogging up on the inside. If that is the case, the Climatic control module changes various characteristic curves to counteract this. This can be performed, for example, by lowering the evaporator temperature (by activating the A/C compressor), by raising the response thresholds for the request for "automatic recirculation mode", by preventing motor shut-off via the start-stop function, etc.
8. The humidity sensor in the fresh air intake duct needs about 2 minutes to reach its operating temperature after the ignition is switched on. During the warm-up phase, the function of the humidity sensor in the fresh air intake ductus limited.

CAPACITIES

Refrigerant R134a and refrigerant oil capacities, refer to Specifications .

Empty, evacuate and charge refrigerant circuit. Refer to Description and Operation .

Operate the A/C system after filling the refrigerant circuit. Refer to A/C SYSTEM, OPERATING AFTER FILLING REFRIGERANT CIRCUIT .

Note. Note the information regarding operating the A/C system after filling. Refer to A/C Service Station in Description and Operation . Depending on the allocation of the service connection an on the refrigerant line, and on the version of the vehicle, it may be necessary to remove the additional reinforcement on the left suspension strut dome so that the service coupling of the service station can be connected (for example, on the Audi Q5). Refer to Removal and Installation and Refer to Description and Operation . Depending on time period of production and on engine, compressor construction type may vary. At start of production, mechanically driven A/C compressors manufactured by "Denso" (type "6 SEU 14") on 4 and 6 cylinder vehicles and type "7 SEU 17" on 8 cylinder FSI vehicles) were installed. Compressors from other manufacturers may also be installed at a later time. Refer to Removal and Installation Depending on the type of A/C compressor, different refrigerant oil capacities are intended for the refrigerant circuit. Refer to Specifications . Compressor as replacement part has different oil fill capacities, therefore note the exact part number. Refer to Specifications . The reason for the different oil capacities in the compressor is the design of the compressor itself, note these oil capacities. Too much oil in the circuit leads to higher pressures and reduces cooling performance of the system. Too little oil may lead to lubrication problems in the compressor. Always fill refrigerant circuit as far as upper tolerance limit (some refrigerant remains in filler hoses). Only approved refrigerant oils may be added to the refrigerant circuit. Refer to Specifications . Different refrigerant oils are required for A/C compressors made by Zexel / Valeo, Sanden and Denso. Refer to Specifications Use only the specified refrigerant oil from a sealed container and always reseal oil container immediately after use (PAG oil absorbs moisture). Do not use refrigerant oil if it is contaminated with moisture or if the refrigerant oil container has been left open. There are different condenser versions. Check for the correct version and allocation before installing. Refer to CONDENSER, CHECKING VERSION Pay attention to the correct fill capacity for the refrigerant R134a based on the condenser version. Refer to Specifications . Additional information, refer to Specifications .

CLIMATRONIC CONTROL MODULE -J255- A/C CONTROL HEAD

Climatronic Control Module removing and installing, refer to CLIMATRONIC CONTROL MODULE -J255- A/C CONTROL HEAD .

Note. The Climatronic control module display and control heads currently can be interchanged; the component protection is not in effect. Component protection (anti-theft protection) can only be canceled by entering specific vehicle data using the Vehicle diagnostic tester in "Guided Fault Finding". If a Climatronic control module with active component protection (anti-theft system) is installed in a different vehicle, only the functions necessary for vehicle safety can be selected, comfort functions can no longer be selected. Check using the Vehicle diagnostic tester in "Guided Fault Finding". Follow the allocation exactly when replacing the Climatronic control module. Different versions for vehicles with the "Basis" A/C system or the "Comfort" A/C system, with or without buttons for seat heating and / or seat ventilation, etc. The seat heating and ventilation is adjusted by the Climatronic control module; the adjustment is transmitted to the vehicle electrical system control module -J519- via the Data bus. The target temperatures for the different seat heating and seat ventilation settings are stored in the vehicle electrical system control module. Depending on the version of the vehicle electrical system control module and on the vehicle build date, the specified temperature for the seat heating and ventilation can be different with the same setting on the Climatronic control module. Check using the Vehicle diagnostic tester in "Guided Fault Finding" (for the vehicle electrical system control module). If a new Climatronic control module was installed and basic setting was not performed, A/C system regulation is limited and this is displayed in the DTC memory as a malfunction. After installing the Climatronic control module, perform the basic setting for the A/C to specifications by using the Vehicle diagnostic tester in "Guided Fault Finding". The Climatronic control module buttons, displays and rotary switches are illuminated by LEDs (the LEDs cannot be replaced). The function and indicator lights in the buttons and in the rotary switches cannot be replaced separately. If the Instrument Panel Interior Temperature Sensor -G56- measurement is incorrect, check the Climatronic Control Module intake grille trim (it must not be closed) and function of the Interior Temperature Sensor Fan -V42- using the the Vehicle diagnostic tester in "Guided Fault Finding". The selected functions are displayed when the function lights in the various Climatronic Control Module buttons, rotary switches or display fields light up. Depending on the version of the Climatronic control module the currently selected functions will appear only on the Multi Media Interface (MMI) display ("Basis" A/C system) or on the Climatronic control module and on the Multi Media Interface (MMI) display ("Comfort" A/C system). Set the duration of display using the "Adaptation" function in the Climatronic control module Guided Fault Finding using the Vehicle diagnostic tester in "Guided Fault Finding". If no malfunction is stored and the Climatronic Control Module is not working, check the adaptation (the function may be switched off by adjusting the function). If necessary, reset the adaptations in all adaptation channels to the manufacturer setting using the Vehicle diagnostic tester in "Guided Fault Finding". If there is a condition, where the heating or ventilation of the driver of passenger seat cannot be switched on, this will be stored as a malfunction in the Vehicle Electrical System Control Module -J519-, in the Memory Seat/Steering Column Adjustment Control Module -J136- or in Passenger Memory Seat Control Module -J521- (depending on the vehicle type and the vehicle equipment level). Currently no information is sent to the Climatronic control module display and control head via the data bus system; the DTC memory must be read out in each control unit or in the comfort system central control module -J393- using the Vehicle diagnostic tester in "Guided Fault Finding". In the event of a complaint regarding seat heating or seat ventilation, first check the event memory of the control modules activating the seat heating and seat ventilation. From MY 2010, this vehicle has a Start/Stop System for specific engines as optional equipment. On vehicles with Start/Stop system, the Climatronic control module prevents the Stop function. If, for example, "defrost" is selected, the stop function is not possible or will be interrupted and the engine will start. The same applies in the case of heating and cooling. The difference between the selected and actual temperature is greater than a specified value checked using the Vehicle diagnostic tester in "Guided Fault Finding". Vehicles with the Start/Stop System have an additional coolant pump for the Stop function depending on the vehicle equipment level and on the version of the vehicle. Refer to COOLANT PUMP , [For engine(s) CAUA] Description and Operation or to [For engine(s) CAEB] Description and Operation or to [For engine(s) CALA] Description and Operation and the Vehicle diagnostic tester in "Guided Fault Finding".

Scheme 243

1. On the Audi Q5, the Climatronic control module -A-, has an additional trim -B-.

Note. The trim piece -B- is supplied with a two-sided adhesive strip already installed -C-. If the trim piece -B- is going to be re-used when replacing the Climatronic control module -A-, then remove the adhesive strip -C- from the trim -B-. Clean the adhesive surface on the trim -B- as described in the instructions which came with the adhesive strip. Affix to the trim piece -B- a strip (dimension: 204 mm x 10 mm) (8 in. x 0.4 in.) of the two-sided adhesive strip -C- with material strength approximately 1.2 mm (for example with adhesive tape D 438 515 A1. At the start of production, this trim -B- is secured by clips -C- into the openings in the -D- Climatronic control module -A-. Later, the trim piece -B- was redesigned so that it can be secured by a suitable two-sided adhesive tape. The retaining tabs -F- are no longer on the trim piece -B-. Since the openings -D- and slits -E- are no longer being used, only the trim piece -B- with the two-sided adhesive tape for the Climatronic control module -A-, is supplied as a replacement part.

1. Climatronic control module allocation, refer to «CLIMATRONIC CONTROL MODULE -J255- A/C CONTROL HEAD ALLOCATION»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__climatronic-control-module-j255-ac-control) .
2. Climatronic control module, removing and installing, refer to «CLIMATRONIC CONTROL MODULE -J255- A/C CONTROL HEAD»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2) .

CLIMATRONIC CONTROL MODULE -J255- A/C CONTROL HEAD ALLOCATION

1. Beginning 08.2007 the "Comfort" A/C system with an air distribution housing with optimized air distribution will be introduced (distinguishing characteristic between versions "1" and "2". Refer to «COMFORT A/C UNIT AND AIR DISTRIBUTION HOUSING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__comfort-ac-unit-and-air-distribution)
2. The coolant pump -V50- (water pump -V36-) control differs and depends on the date of manufacture.

Note. The coolant pump (water pump) versions and activation differ depending on the version of the vehicle and production period. From MY 12 beginning with start of production, pumps that were controlled by a 500 Hertz signal (500 pulses per second) are being replaced by pumps that are controlled by a 100 Hertz signal depending on the engine. Pumps, controlled by a 100 Hertz signal, also have a diagnostic function and are controlled by the engine control module. Check for the correct allocation. Refer to the Vehicle diagnostic tester in "Guided Fault Finding", and to appropriate SYSTEM WIRING DIAGRAM.

On vehicles with a version "2" A/C system, the Climatronic control module for the "Comfort" A/C system with part number "8T1 820 043" beginning with the index letter "Q" is or will be installed.

If on vehicles with the version "1" A/C system, a Climatronic control module with the "Comfort" A/C system, with part number "8T1 820 043" beginning with the letter "Q" is installed. The adaptation is changed in adaptation channel 18 using the Vehicle diagnostic tester in "Guided Fault Finding".

Note. There is a label -A- on the outside of the A/C unit with a part -B- that tells which version is installed. The part number -B- on the decal -A- can be read when the CD changer is removed (depending on the vehicle equipment level).

The Climatronic control module for the "Comfort" A/C system with part number "8T1 820 043" through letter "S" may not be installed in the version "2" A/C.

Note. On the "Basis" A/C system, the A/C unit and the air distribution housing were not changed.

1. On the Audi A5 Coupe and Audi A4 from MY 2009, the Climatronic control module, part number 8T1 820 043 starting with the index letter "T" is installed (on the Audi Q5 this was already installed since the start of production).

On vehicles with these A/C control heads, and depending on the coding and adaptation, for example the display on the screen for the "MMI" (Multi Media Interface), when using the buttons and knobs, the A/C control head no longer switches to "A/C system". The selected functions for the A/C system appear in the display sequentially. Check with the Vehicle diagnostic tester in "Guided Fault Finding", the Owner's Information and the Owner's Information / MMI.

Pay attention to the correct allocation, coding and adaptation of the Climatronic control module, for the Front Information Display Control Head Control Module -J523- / Information Electronics Control Module 1 -J794-. Refer to the Vehicle diagnostic tester in "Guided Fault Finding". If the allocation, coding or adaptation are incorrect, the A/C function cannot be displayed or selected in the MMI.

Note. The Climatronic control module, part number 8T1 820 043 up to index letter "S" are installed on vehicles with a front information display control head control module -J523-. The Climatronic control module, part number 8T1 820 043 beginning with index "T" may be installed on vehicles with an Information Electronics Control Module 1 -J794- and an Information Electronics Control Module 1 -J794-. In order to be able to select and display the different functions, the coding and adaptation must be correct for the vehicle equipment level.

1. From MY 2010, this vehicle has a Start/Stop System for specific engines as optional equipment.
2. As a running change in MY 10, gasoline engines that can run on bioethanol (Flex Fuel Vehicles) were introduced

Note. On vehicles with Start/Stop system, the Climatronic control module prevents the Stop function. If, for example, "defrost" is selected, the stop function is not possible or will be interrupted and the engine will start. The same applies in the case of heating and cooling. The difference between the selected and actual temperature is greater than a specified value shown using the Vehicle diagnostic tester in "Guided Fault Finding". Only Climatronic control modules with part number 8T1 820 043 from index "AG" or with part number 8K_ 820 043 are or will be installed in vehicles equipped with the Start/Stop System. Refer to the Vehicle diagnostic tester in "Guided Fault Finding". The coolant pump -V50- (water pump -V36-) differs and depends on the date of manufacture and on the version of the vehicle. Make sure to use the correct version of the Climatronic control module. Note that a Climatronic control module, part number 8T1 820 043 starting with index "AG" must also adapt the cooling pump (water pump) control. Refer to COOLANT RECIRCULATION PUMP -V50- (WATER PUMP -V36-) and to the Vehicle diagnostic tester in "Guided Fault Finding". The coolant pump (water pump) versions and activation differ depending on the version of the vehicle and production period. From MY 12 beginning with start of production, pumps that were controlled by a 500 Hertz signal (500 pulses per second) are being replaced by pumps that are controlled by a 100 Hertz signal depending on the engine. Pumps, controlled by a 100 Hertz signal, also have a diagnostic function and are controlled by the engine control module. Check for the correct allocation. Refer to the Vehicle diagnostic tester in "Guided Fault Finding", to the appropriate SYSTEM WIRING DIAGRAM. As a running change in MY 10, gasoline engines that can run on bioethanol (Flex Fuel Vehicles) were introduced, which currently have an auxiliary heater heating element -Z35-. Refer to AUXILIARY HEATER HEATING ELEMENT -Z35-, TESTING . The activation of the auxiliary heater heating element) occurs for vehicles with a gasoline engine from the Climatronic control module via the local Data bus (controlled using the same outlet and also using the fresh air blower control module -J126-) on the auxiliary air heater control module -J604-. Refer to appropriate SYSTEM WIRING DIAGRAM. Only Climatronic control modules with part number 8T1 820 043 from index "AG" or with part number 8K_ 820 043 are or will be installed in vehicles equipped with a gasoline engine that can also run on bioethanol. Refer to the Vehicle diagnostic tester in "Guided Fault Finding".

1. Vehicles with a high voltage system (hybrid vehicles)

Note. Only the Climatronic control module, part number 8R1 820 043, may be installed on vehicles with a high voltage system (only for LHD vehicles until the version change-over) (from MY 12 see below). Refer to the Vehicle diagnostic tester in "Guided Fault Finding". Climatronic control module, part number 8R1 820 043, may be installed only in high voltage vehicles through the vehicle version change-over (from MY 12 see below). After the model year change-over, Climatronic control module, part number 8K_ 820 043, is being installed in high voltage vehicles. Pay attention to the part number index and coding. Refer to the Vehicle diagnostic tester in "Guided Fault Finding". Vehicles built after the version change-over can only use one the different Climatronic control modules listed. A Climatronic control module, with part number 8K_ 820 043 and index "K or AA" through index "P or AE" does not have the necessary functions needed by high voltage vehicles. These functions are integrated in a Climatronic control module with part number 8K_ 820 043 from index "Q or AF". Instead of a Climatronic control module with part number 8Kx 820 043 and index "Q", a control module with index "AF" can be installed (the function for controlling the A/C clutch -N25- is not used). . The coding in the Climatronic control module turns off or activates the necessary functions for the vehicle. Refer to the Vehicle diagnostic tester in "Guided Fault Finding function".

1. From MY 12, as a running change (depending on the model and version), a revised Climatronic control module is being installed.

Note. From MY 12, the change-over was made on the Audi A4 and Audi A5 as a running change. Vehicles built before the change-over may only have Climatronic control module with part number 8T__ 820 043 may be installed (only Climatronic control module with part number 8R1 820 043 may be installed on high voltage vehicles). Vehicles manufactured after the change-over may only have Climatronic control module with part number 8K_ 820 043. Refer to the Vehicle diagnostic tester in "Guided Fault Finding". When the "Comfort" A/C system is installed, the Climatronic control module with part number 8T_ 820 043 (with part number 8R1 820 043) -A-) and with part number 8K_ 820 043 -B- and be differentiated as follows: the Climatronic control module -A- installed from start of production (part number 8T_ 820 043 / 8R1 820 043) the seat heating and ventilation are controlled by the buttons -C- and the rotary switch. From the vehicle version change-over (from MY 12 as a running change) on the installed Climatronic control module -B- (part number 8K_ 820 043) two separate buttons -D- and -E- operate the seat heating and seat ventilation. The location of the buttons -F- and -G- is different between both versions. The seat heating and seat ventilation can be adjusted separately in 3 speed with the introduction of the Climatronic control module, version -B-. Refer to the Owner's Information. When installed on the "Basis" A/C system, the Climatronic control module with part number 8T_ 820 043 (with part number 8R1 820 043) -A-) and with part number 8K_ 820 043 -B- can be differentiated as follows: Both versions -A- and -B- can be differentiated by the rotary adjuster (version -B- with a chrome ring) and by the seat heating buttons. The seat symbols in the buttons -C- and -D- point in different directions on the Climatronic control module -A- installed from start of production. When the Climatronic control module -B- is installed, the seat symbols on the buttons -C- and -D- point in the same direction from the vehicle version change-over (from MY 12 as a running change). The seat heating can be adjusted separately in 3 speeds with the introduction of the Climatronic control module, version -B-. Refer to the Owner's Information. An updated fresh air blower control module -J126-, fresh air blower -V2-, Climatronic control module, vehicle electrical system control module -J519-, comfort system central control module -J393-, air quality sensor -G238- and air conditioner are being installed as a running change from MY 12 (depending on the vehicle version). Pay attention to the version and allocation of these components. Refer to the Vehicle diagnostic tester in "Guided Fault Finding" function. The fresh air blower control module does not control the fresh air blower if the Climatronic control module allocation or adaptation to fresh air blower module (part number 8K0 820 521 or 8T0 820 521) is not according to the specification. There may not always be an entry in the DTC memory even though the activation of the fresh air blower is not OK. Make sure the Climatronic control module adaptation is correct. Refer to the Vehicle diagnostic tester in "Guided Fault Finding" function. At the start of production, the humidity sensor -G355- was installed only on the "Comfort" A/C system. The humidity sensor is being installed in vehicles equipped wit the "Basis" A/C system and since the introduction of the Stop/Stop System from MY 10. The comfort system central control module or the data bus on board diagnostic interface -J533- evaluates the measured value from the humidity sensor on vehicles manufactured prior to the version change-over (except Audi Q5 Hybrid). The vehicle electrical system control module evaluates the measured value from the humidity sensor on vehicles manufactured from the product change-over (on all Audi Q5 Hybrid). Refer to appropriate SYSTEM WIRING DIAGRAM, and to Removal and Installation and the Vehicle diagnostic tester in "Guided Fault Finding" function. There is a label -A- on the outside of the A/C unit with a part -B- that tells which version is installed. The part number -B- on the decal -A- can be read when the CD changer is removed (depending on the vehicle equipment level). Refer to Removal and Installation . There are different versions of the coolant recirculation pump -V50- (water pump -V36-) installed depending on the vehicle version and on the engine and when the vehicle was manufactured as a running change from MY 12. How the pumps are controlled is also different. From the start of MY 12, pumps, which were controlled by a 500 Hertz signal (500 pulses per second), are replaced by 100 Hertz signal pumps. Pumps, controlled by a 100 Hertz signal, also have a diagnostic function and are controlled by the engine control module. Check for the correct allocation, refer to the Vehicle diagnostic tester in "Guided Fault Finding", to the appropriate SYSTEM WIRING DIAGRAM.

1. An A/C compressor with an A/C clutch -N25- is installed as a running change on certain 4 cylinder vehicles from MY 12.

Note. The A/C clutch turns off the A/C compressor drive completely under certain conditions (for example "ECON"). The correct Climatronic control module must be installed and it must be coded correctly so that the Climatronic control module can control the A/C clutch. Refer to the Vehicle diagnostic tester in "Guided Fault Finding". In order for the Climatronic control module to be able to control the A/C clutch, only one Climatronic control module must be installed in these vehicles that has the necessary functions to control the A/C clutch (Climatronic control module with part number 8K_ 820 043 and index "K" cannot control an A/C clutch). Climatronic control module with part number 8K_ 820 043 and index "AA" can control the A/C clutch. In place of a Climatronic control module with part number 8K_ 820 043 and index "K", a version with index "AA" (controlling the A/C clutch is not used) or index "AF" (controlling the A/C or high voltage vehicles is not used) can be installed. The coding in the Climatronic control module turns off or activates the necessary functions for the vehicle. Refer to the Vehicle diagnostic tester in "Guided Fault Finding" function.

CONDENSER, CHECKING VERSION

Note. Depending on when the vehicle was manufactured, on the version of the vehicle and on the engine, different condensers are installed on these vehicles. These condensers differ in their inner construction and volume. The refrigerant circuit capacity depends on the condenser. Always see which version of the condenser is installed when determining the refrigerant capacity. Currently condensers made by different manufacturers are being installed ("Denso" and "Showa / Keihin"). Each has specific distinguishing marks. A condenser from one manufacturer can have a different construction but from the outside only the part number is different. The construction (different low distribution, different inner volume) determines the refrigerant capacity for the refrigerant circuit. Refer to Specifications .

Checking

Remove the bolts (or clips) -1, 2, 3 and 5-. Refer to Removal and Installation .

Scheme 244

Remove the cover -4- from the lock carrier and disengage the radiator grille. Refer to Removal and Installation .

CONDENSER DISTINGUISHING MARKS

Identifying a condenser made by "Denso" -A

Scheme 245

1. The upper sealing strip -B- is U-shaped.
2. Manufacturer part number and manufacturing date -C- (currently printed directly on it)
3. Reservoir -D- integrated on the condenser, dryer cartridge with removed plastic screw (cover) replaceable, refer to «REFRIGERANT CIRCUIT COMPONENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) .

Note. There are different versions of this condenser in its construction (recognizable, for example, by the part number 8K0 xxx xxx or 8T0 xxx xxx). Refer to REFRIGERANT CIRCUIT COMPONENTS

Identifying a condenser made by "Showa / Keihin" -A

Scheme 246

1. The upper sealing strip -B- is flat.
2. Manufacturer part number and manufacturing date -C- (currently on a label glued to it)
3. Reservoir -D- attached to the condenser (the reservoir can be replaced, refer to «REFRIGERANT CIRCUIT COMPONENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) ).

CONTACT CORROSION

Contact corrosion can occur if inappropriate fasteners (bolts, nuts, washers, rivets, plugs, grommets, adhesives etc.) are used.

For this reason, the manufacturer only installs fasteners with a special surface coating. Also, rubber and plastic parts and adhesive consist of materials that do not conduct electricity. These parts, which have been tested and are aluminum compatible, are also available as replacement parts.

Note

1. Always install new parts if there is any doubt as to whether parts can be reused.
2. Original equipment replacement parts are recommended. They have been tested and are compatible with aluminum.
3. Audi accessories are recommended.
4. Damage due to contact corrosion is not covered by warranty.

DUST AND POLLEN FILTER WITH ACTIVATED CHARCOAL INSERT

1. There are different versions of the dust and pollen filter without and with filter insert with activated charcoal. On vehicles equipped with the "Comfort" A/C system, there is currently a dust and pollen filter with an activated charcoal filter element installed; on vehicles equipped with the "Basis" A/C system, there is a dust and pollen filter without the activated charcoal filter element installed.
2. In model year 2012, vehicles with a "Comfort" A/C system will have a modified dust and pollen filter with an activated charcoal filter element installed as a running change. This filter with an improved interception rate for fine particulates has approximately the same air resistance values as the filter installed prior to the change, and for this reason will be in installed in vehicles built up to the change.
3. The dust and pollen filter has an additional filter insert made of activated charcoal on vehicles with the "Comfort" A/C system. These vehicles also have an air quality sensor -G238-. Refer to «AIR QUALITY SENSOR -G238- AND HUMIDITY SENSOR IN FRESH AIR INTAKE DUCT -G657- FUNCTION»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__air-quality-sensor-g238-and-humidity) .
4. The activated charcoal filter element functions as a dust and pollen filter, however in addition the activated charcoal filter can also filter out gaseous pollutants, for example, ozone, benzene, nitrogen dioxide from the air flow. The basic task of the activated charcoal layer in the dust and pollen filter is to keep load peaks out of the passenger compartment.
5. The activated charcoal also has the task of removing certain gaseous contaminants from the air flowing through. The activated charcoal layer in the dust and pollen filter reacts differently to various pollutants in the air.

Certain pollutants bond permanently in the activated charcoal layer.

Others are converted into innoxious bonds as in a catalytic converter.

For the rest the activated charcoal works as a condenser (capacitor). With increasing load pollutants are absorbed, until a certain saturation is reached. If the amount of pollutants decreases, the activated charcoal layer continuously releases the absorbed particles.

1. Because a portion of the gaseous pollutant particles as well as dust and pollen bond permanently to the activated charcoal layer, the dust and pollen filter should be changed more often than scheduled under the following conditions

If vehicle is driven in areas with constant strong air pollution. the activated charcoal layer in the dust and pollen filter is saturated faster than planned.

If vehicle is predominantly driven with the "automatic recirculating" mode switched off.

1. If possible, vehicles with A/C system with one air quality sensor should always be operated in "automatic air recirculation" mode. However, if it is desired or necessary to switch this mode off, the following must be observed

The active carbon layer in the dust and pollen filter is saturated after a certain time.

A saturated filter can no longer absorb pollutants and allows them to pass unhindered.

1. The most important task of the dust and pollen filter activated charcoal filter element and the air quality sensor is to keep the load peaks out of the passenger compartment. For this the following must be observed

The vehicle is driven in an area with relatively clean air. with few air pollutants. The switch-over from fresh air mode to recirculating air mode will occur at a different time than on a vehicle driven in an area that has high air pollutants, for example, in an industrial area.

Independently of the basic load, the change-over from fresh to recirculating mode always occurs, when the pollutant-load increases (for example when driving to through an exhaust cloud of a diesel truck).

CAUSES OF ODOR

Note. Odors from the air conditioning system can be caused by various things, only a portion of these orders come from the evaporator and can be corrected by cleaning it with, for example, the Ultrasound A/C Cleaner VAS 6189A.

1. Smells like burnt oil.

Mostly forms in the engine compartment due to leaks on the engine or transmission.

1. Sulphurous smell similar to exhaust.

Due to leaks in the exhaust system.

Through exhaust fumes, which get into the passenger compartment, for example, when driving in reverse through an exhaust gas cloud.

1. Fishy smell like coolant.

From leak at cooling system of engine or of A/C system heater core.

Note. If fishy odor occurs depending on temperature setting (weaker with temperature setting "Cold" than with temperature setting "Warm"), check A/C unit heater core for leaks (air does not flow constantly through heater core).

1. Smells like a burned clutch.
2. Evaporation from floor mats, decorative seat covers, etc.
3. Rotten, mildewy, moldy or musty smell from plenum chamber.

Due to various contaminants, such as leaves, pine needles, etc. collecting.

Due to water that cannot drain out of the plenum chamber.

Note. Check plenum chamber water drains. Refer to PLENUM CHAMBER WATER DRAIN .

1. Smell from air conditioner.

Note. Odors originating in the heating and A/C unit can mainly be detected in fresh air mode and recirculated air mode. If a smell occurs only in fresh air or recirculation mode, the cause is probably not the A/C unit. In the case of a leaking heater core, the odor of the escaping coolant mostly depends on the temperature setting. With "Cold" temperature setting, air does not flow through the heater core and the odor is not as strong.

Due to too much condensation water in A/C unit.

Note. Check both condensation water drains. Refer to CONDENSATION WATER DRAIN HOSE .

Due to an old or heavily contaminated dust and pollen filter.

Note. Check dust and pollen filter. Refer to DUST AND POLLEN FILTER .

Due to deposits on evaporator fins.

Note. Clean evaporator with the VAS 6189. Refer to EVAPORATOR, CLEANING WITH ULTRASOUND A/C CLEANING SYSTEM .

EVAPORATOR, CLEANING WITH ULTRASOUND A/C CLEANING SYSTEM

Special tools and workshop equipment required

1. Ultrasound 0 A/C Cleaner VAS 6189A.
2. Cleaning Fluid VAS 6189/1

Note. Numerous procedures varying in their application and effect are available on the market for cleaning the evaporator. Current Audi offers the VAS 6189A which has been approved and released for cleaning the evaporator. If in the course of time additional procedures are tested and approved by Audi.

Select path

Preparation

Check whether odor is actually in A/C evaporator by switching from fresh air to recirculation.

Note. The odor can only be removed by cleaning with the VAS 6189A if it originates in the evaporator.

Check the plenum chamber and the water drain valves for dirt and debris and clean if necessary. Refer to PLENUM CHAMBER WATER DRAIN .

Remove the dust and pollen filter and check for odors and dirt. Refer to DUST AND POLLEN FILTER .

Note. On this vehicle, the dust and pollen filter is installed between Fresh Air Blower -V2- and evaporator, therefore it must be removed for the cleaning.

Clean the installation compartment of the A/C dust and pollen filter (remove leaves, dust and other contaminants). Refer to DUST AND POLLEN FILTER .

Reseal opening on A/C unit through which dust and pollen filter was removed.

Start the engine.

Note. It is sufficient to activate the ready mode on vehicles with the high voltage system (watch the display in the instrument cluster control module -J285-). Refer to the Owner's Information. The engine must not be running when the ready mode is activated on vehicles with the Start/Stop System. Refer to the Owner's Information.

On the Climatronic control module -J255- A/C display control head, set the "recirculation mode" and switch off the A/C compressor (the indicator lamp in the AC button does not illuminate).

Open instrument panel vent and set the lowest temperature possible on the Climatronic control module ("Cold" temperature setting).

Closes the windows and sunroof.

Set Climatronic control module to lowest fresh air blow level and select "Instrument panel vent" for air flow direction.

Cleaning

Shake the bottle of Cleaning Fluid VAS 6189/1 and pour the contents into the VAS 6189A (when doing this, be sure to read the operation Information which comes with the VAS 6189A).

Place the VAS 6189A in the passenger's footwell.

Start VAS 6189A (according to operating instructions) and route outlet hose belonging to it so vapor escaping via A/C unit recirculated air opening (in passenger footwell behind the glove compartment) is drawn in by fresh air blower.

Close the vehicle doors.

Note. The cleaning process takes about 15 to 20 minutes. It is complete when vapor no longer comes out of outlet hose.

Finishing steps

Switch off the VAS 6189A.

Open the vehicle doors and air out the passenger compartment for at least 10 minutes.

Remove VAS 6189A from vehicle and clean it according to operating instructions.

Turn off the ignition.

Install the dust and pollen filter. Refer to DUST AND POLLEN FILTER .

PAINTING ON VEHICLES WITH AIR CONDITIONING SYSTEM

When performing paint work repairs, object temperatures of 80 °C (176 °F) are not to be exceeded in drying booths or their pre-heating areas.

Reason

Exposure to heat creates considerable pressure in the system, which could cause it to burst.

REFRIGERANT CIRCUIT O-RINGS

1. Always use O-rings only once, replace.
2. Coat the O-rings with refrigerant oil before installing.
3. Make sure O-rings are seated properly on pipe or in groove.
4. Check the connections on the components and refrigerant lines for damage (even a small scratch can lead to leakage).
5. Perform the work under clean conditions (even the smallest deposit such as a hair may cause a leak).

Note. Install only O-rings that are resistant to refrigerant R134a and corresponding refrigerant oil. The O-rings are color-coded to avoid mistakes (currently "red", "light purple" and "dark purple"). The O-ring dimensions -a- and -b- are different depending on installation location.. In addition to the color-coded O-ring seals, use is also made at the factory of black O-ring seals for certain connections.

REFRIGERANT CIRCUIT DRAINING

Refrigerant is never to be allowed to escape into the atmosphere, but rather it is to be extracted from the refrigerant circuit using an extractor or A/C service station. The drained refrigerant will be locally recycled or is send to an environment-recycling place to the manufacturer (different or additional laws may apply in individual companies). For this reason, bring vehicle to a workshop that has the necessary tools and in which the work can be performed accordingly by qualified personnel. Refer to General Information .

Reason

If refrigerant R134a is released into the environment, it enhances the green house effect.

Note. Refrigerant R134a has far less of a greenhouse effect than R12. Because R-134a does not contain chlorine atoms, the major catalyst in ozone depletion, refrigerant R-134a has no ozone depletion potential. Depletion of the ozone layer in the upper atmosphere is however only brought about by the splitting of carbon-chlorine bonds (as is the case, for example, with refrigerant R12).

Disconnect the connector from the A/C compressor regulator valve -N280- or from the A/C pressure/temperature sensor -G395- after draining the air conditioner.

Reason

The A/C compressor regulator valve is no longer activated and the A/C compressor runs at idle. The A/C compressor is designed so the lubrication of the A/C compressor components at idle is guaranteed by an internal oil circuit (as long as there is enough refrigerant oil in the A/C compressor).

WORKING ON THE REFRIGERANT CIRCUIT

Work on refrigerant system should only be performed in a ventilated rooms (workshops). Ensure that with in 5 meters circumference are no working-pits, basement staircases or shafts. Turn on the existing ventilation systems.

Reason

The refrigerant emerging is not only colorless and odorless, but also heavier than air and thus displaces oxygen. If refrigerant gas does escape even though all the safety precautions have been followed, there is a risk of suffocating in poorly ventilated areas and in workshop pits - even if it is not noticeable.

Note. The escaping refrigerant/air mixture should not be inhaled, but should be extracted via an existing exhaust-extraction ventilation system.

Do not attempt repair on filled air conditioning systems by soldering, brazing or welding. This pertains also for welding and soldering work on the vehicle, in the event that parts of the climate control system may heat up

Reason

Exposure to heat creates considerable pressure in the system, which could cause it to burst.

Corrective action

Discharge refrigerant circuit. Refer to REFRIGERANT CIRCUIT DRAINING .

Note. Parts on the A/C that are damaged or leaking cannot be welded or soldered. They must be replaced.

When servicing air conditioner, all open components and pipe connections are to be immediately re-sealed.

Reason

Moisture will enter into air conditioner components if they are left open for a lengthy period. If this is the case, air conditioners cannot be refilled without having to replace parts of the system.

With high voltage systems (hybrid vehicles)

Read and follow all of the supplemental warnings for all work performed on vehicles with the high voltage system. Refer to HIGH VOLTAGE SYSTEM (HYBRID VEHICLES) REPAIRS

If it is necessary for the following procedure to perform work in the vicinity of high voltage components, perform a visual inspection of the high voltage components and cables for damages, refer to VISUAL INSPECTION OF HIGH-VOLTAGE COMPONENTS AND CABLES FOR DAMAGE .

If it is necessary to perform work on the high voltage components, disable the high voltage system. Refer to disable the high voltage system see above.

Note. The A/C compressor control module -J842- integrated in the electrically driven A/C compressor regulates the blower speed and therefore the A/C compressor output (electrical A/C compressor -V470-).

Without a high voltage system

Note. The A/C compressor without an A/C clutch -N25- is always also driven when the engine is running. If the vehicle has an A/C compressor without an A/C clutch, then the vehicle may only be started when the refrigerant circuit has been properly assembled. For example; if the refrigerant lines are not connected to A/C compressor, when the engine is running the A/C compressor may heat up (via internal heat generation) so much that the A/C compressor will be damaged. Such internal heat generation results from the fact that - even with delivery near 0% - the compressor is operating with a fixed resistance (sealed circuit). An A/C compressor with an A/C clutch is installed as a running change on certain 4 cylinder vehicles from MY 12. Refer to BELT PULLEY WITH A/C CLUTCH -N25- OVERVIEW . The A/C clutch turns off the A/C compressor drive completely under certain conditions (for example "ECON"). The correct Climatronic control module must be installed and it must be coded correctly so that the Climatronic control module display and control unit can control the A/C clutch. To stop the A/C compressor from being destroyed when the refrigerant circuit is empty, it is designed such that delivery is reduced to roughly 0% and lubrication is maintained by way of an internal oil circuit with the oil left in the A/C compressor.

All vehicles

Note. Refrigerant in refrigerant circuit is never to be topped up (drain, evacuate and refill circuit). Refer to Description and Operation . The entire amount of refrigerant oil to be added to the refrigerant circuit is in the replacement compressor. Refer to Specifications . Different refrigerant oils are required for A/C compressors made by Denso, Sanden and Zexel/Valeo. Refer to Specifications and the Electronic Parts Information. Coat the O-ring seals lightly with refrigerant oil prior to installation. Refer to REFRIGERANT CIRCUIT O-RINGS . The specified diameters for O-rings and the tightening torque pertain also to the threaded connections of the refrigerant lines or refrigerant hoses between the separate components. Only install O-rings that have been approved to be used with refrigerant R134a. Refer to REFRIGERANT CIRCUIT O-RINGS , Description and Operation and to the Parts Information. Check cooling performance. Refer to A/C COOLING OUTPUT, CHECKING . Check pressures in refrigerant circuit. Refer to Diagnosis and Testing . All refrigerant circuit servicing and test procedures not described in this repair Information, refer to Description and Operation . Operate the A/C system after filling the refrigerant circuit. Refer to A/C SYSTEM, OPERATING AFTER FILLING REFRIGERANT CIRCUIT . From the start of production through the change-over from MY 12, evaporators approximately 40 mm wide (block depth) are being installed (air conditioner part number "8K_ 820 005"). From MY 12, as a running change and depending on the version of the vehicle, an approximately 50 mm wide evaporator (block depth) is being installed (air conditioner part number "8T_ 820 005"). Pay attention to the correct allocation of the evaporator expansion valve (there are different versions).

1. Refer to «REFRIGERANT CIRCUIT COMPONENT OVERVIEW»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__refrigerant-circuit-component-overview-engine) .
2. Refer to «REFRIGERANT CIRCUIT COMPONENT OVERVIEW»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__refrigerant-circuit-component-overview-engine) .

VISUAL INSPECTION OF HIGH-VOLTAGE COMPONENTS AND CABLES FOR DAMAGE

Procedure: Performing a visual inspection

1. Be aware of the power and control electronics for the electrical system, the high voltage cables for the battery and A/C compressor, and the cables for the (electro-drive drive motor) when performing the visual inspection in the engine compartment!
2. Be aware of the high voltage cables and their corresponding covers when performing the visual inspection of the floor panel.
3. Be aware of the traction battery -A2-, the high voltage cables for the battery and the electronics box with the high voltage system maintenance connector!

Pay attention to the following items when performing a visual inspection

1. The high voltage components do not display any signs of external damage.
2. The high voltage cable insulation must be in tact and the cables are must not be damaged.
3. Look for any abnormal deformations of the high voltage cables.
4. Contact the high voltage technician or the electronics specialist about any abnormalities or uncertainties!
5. Further information about the high voltage system may be found here. Refer to «HIGH VOLTAGE SYSTEM (HYBRID VEHICLES) REPAIRS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__high-voltage-system-hybrid-vehicles-repairs) .

A/C COMPRESSOR DRIVE UNIT OVERVIEW

Note. If the drive plate overload protection triggers, check the A/C compressor for ease of motion before replacing the drive unit. If the A/C compressor creates friction, replace it completely.

Scheme 247

1. A/C Compressor Input Shaft Tightening specification 60 Nm Check, the driveshaft must be seated free of play in splines of engine drive wheel with thread tightened. Refer to «A/C COMPRESSOR INPUT SHAFT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) . Loosening and tightening, refer to «A/C COMPRESSOR INPUT SHAFT, LOOSENING AND TIGHTENING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__ac-compressor-input-shaft-loosening-and) . Removing and installing, refer to «A/C COMPRESSOR INPUT SHAFT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) . Grease the splines to the engine drive wheel with grease G 000 100.
2. Hex Socket Head Bolt Tightening specification 10 Nm
3. Drive Plate The overload protection takes over when the torque is excessive (for example, if the A/C compressor runs with resistance) and the input shaft runs freely without driving the A/C compressor. Run-out, checking and adjusting, refer to «DRIVE PLATE WITH OVERLOAD PROTECTION, CHECKING RUN-OUT AND ADJUSTING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__drive-plate-with-overload-protection-checking) . Removing and installing, refer to «DRIVE PLATE WITH OVERLOAD PROTECTION»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__drive-plate-with-overload-protection) .
4. Drive Plate Tightening specification 30 Nm Attached to the A/C compressor input shaft The overload protection takes over when the torque is excessive (for example, if the A/C compressor runs with resistance) and the input shaft runs freely without driving the A/C compressor. Removing and installing, refer to «A/C COMPRESSOR DRIVE PLATE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__ac-compressor-drive-plate) .
5. Rubber Element When the drive unit decouples, the vibrations and noises are dampened. When installing, coat the rubber elements B lightly using soapy water (as a lubricant). Removing and installing, refer to «A/C COMPRESSOR DRIVE PLATE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__ac-compressor-drive-plate) .
6. Spacer The original disc must be installed Dimension: 17.5 x 10 x 3 mm
7. Circlip Replace Install on correct side (flat side toward A/C compressor) Removing and installing, refer to «DRIVE PLATE WITH ANTI-FRICTION BEARING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__drive-plate-with-anti-friction-bearing) .
8. Drive Plate With roller bearing. Removing and installing, refer to «DRIVE PLATE WITH ANTI-FRICTION BEARING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__drive-plate-with-anti-friction-bearing) . Clean the A/C compressor flange before installing the drive plate.
9. A/C Compressor Different versions may be installed, depending on engine version and country version of vehicle.

A/C CONTROL MOTOR BLOCK DIAGRAM

Note. Revised A/C units are being installed from MY 12 (use depends on the vehicle version) (A/C unit part number "8T_ 820 005"). With the introduction of these A/C units, other control motors are also being installed, which can be installed with both versions of the A/C units (interchanging is currently permitted). On this vehicle, the different control motors (-A- through -N-) on the A/C are adapted and controlled over a data line. The different control motors (-A- through -N-) are connected in sequence to the Climatronic Control Module -J255- via this data line (LIN bus). If there is a malfunction on one control motor or in the wiring, this malfunction can lead to different malfunction entries with different malfunction types. Check using the Vehicle Diagnostic Tester under "Guided Fault Finding" and appropriate SYSTEM WIRING DIAGRAM. The number of control motors on the A/C depends on the A/C version (on the "Basis" A/C system there are 6 control motors, and on the "Comfort" A/C system there are 10 control motors). Refer to appropriate SYSTEM WIRING DIAGRAM. The sequence of the control motors in the wiring depends on the A/C version ("Basis" or "Comfort"). Refer to appropriate SYSTEM WIRING DIAGRAM. When equipped with the "Comfort" A/C system, the left temperature flap motor -V158- is installed in position -A-. Vehicles with the "Basis" A/C system, the temperature regulator door motor -V68- is installed at -A-. Refer to appropriate SYSTEM WIRING DIAGRAM.

Dependent on the operation mode or the function of the A/C Guided Fault Finding in which a malfunction appears, the effect of the malfunction and the type of malfunction stored in the DTC memory is different. Check using the Vehicle Diagnostic Tester under "Guided Fault Finding".

1. If there is a malfunction in the control motors sequence (two or more terminals or control motors were interchanged while being installed)

If these control motors were improperly adapted during the basic setting and the activation of the doors is incorrect (incorrect assignment)

Depending on the adjustment range for this control motor, an incorrect end stop is recognized during the basic setting and this is stored as a malfunction in the event memory, and the basic setting is terminated.

If the wrong door moves, then the air flow direction is incorrect. This is not always recognized as a fault depending on the adjustment range of the control motor. Always mark all connectors before disconnecting them and perform a basic setting after connecting them.

1. If there is a malfunction in the normal operation of the A/C, then the following malfunction entries can result, depending on the type of malfunction.

If there is a malfunction in the ground connection to a control motor, then this control motor can no longer exchange information with the Climatronic Control Module and this control motor will store this in the DTC memory.

If there is a malfunction in the data line to a control motor (for example, an interruption in the connector to the control motor -B- contact "2"), then this control motor and all the connected control motors (-C- through -N-) in the sequence switching after this motor can no longer exchange information with A/C Control Head Climatronic control module ; this motor as well as all the other connected control motors will be stored in the DTC memory.

If a malfunction occurs in the control motor electronics (for example, in control motor -B-), the control motor -B- can possibly still exchange information with the with the A/C Control Head Climatronic control module, depending on the type of malfunction, however all the motors connected after this one (-C- through -N-) will be stored in the DTC memory.

1. If there is a malfunction during the basic setting of the A/C, then the following malfunction entries can result, depending on the type of malfunction.

If there is a malfunction in the ground connection to a control motor, (for example to control motor -B-), then this control motor cannot exchange information with the Climatronic control module display and control head will not be recognized during the basic setting. During the basic setting, all the control motors from the last control motor beginning with -N- are re-allocated and re-assigned; this control motor is no longer in sequence. The A/C Control Head Climatronic control module recognizes that a control motor is missing and saves the first control motor in the sequence switching as missing (for example, on left-hand drive vehicles equipped with the "Comfort" A/C system, the Left Temperature Door Motor -V158-) ; moreover, the malfunction will display as "Automatic Addressing Malfunctioning" and possibly by certain control motors "Upper or Lower Values Exceeded".

If there is a malfunction in the data line to a control motor (for example, an interruption in the connector leading to contact "2" of the control motor -C-), then this motor and all the other connected motors in the sequence switching can no longer exchange information with the Climatronic control module display and control head and these motors will not be recognized in the basic setting. During the basic setting, all the control motors from the last control motor beginning with -N- are re-allocated and re-assigned; these control motors are no longer in sequence. The A/C Control Head Climatronic control module recognized that several control motors are missing (only control motors -B- -A- are recognized and incorrectly assigned and adapted as back pressure door motor -V71- and air recirculation door motor -V113-). All other control motors (for example, with the "Comfort" A/C system, from the right footwell door motor -V109- up to the left temperature door motor -V158-) are stored in the DTC memory as missing and the malfunction is displayed as "Automatic Addressing malfunctioning".

If a malfunction occurs in the control motor electronics or during the basic setting (for example, in control motor -C-), the motor can possibly still exchange information with the with the Climatronic control module display and control head depending on the type of malfunction, however all the motors connected after this one (up to motor -N-) no data can be exchanged. The Climatronic control module display and control head recognizes that several control motors are missing (only control motors -C- up to -A- are recognized and incorrectly assigned and adapted as recirculation door motor and back pressure door motor and right footwell door motor). All other control motors (for example, on vehicles equipped with the "Comfort" A/C system, from the right center vent motor -V111- up to the left temperature door motor) are stored in the DTC memory as missing and the malfunction is displayed as "Automatic Addressing malfunctioning".

A/C UNIT AND AIR INTAKE HOUSING COMPONENTS

Observe notes for control and regulation of components in passenger compartment. Refer to A/C SYSTEM CONTROL AND REGULATION COMPONENTS INSIDE PASSENGER COMPARTMENT .

There are different versions of the A/C system (for "Comfort" A/C system or the "Basis" A/C system etc.).

Note. There is a label -A- on the outside of the A/C unit with a part -B- that tells which version is installed. The part number -B- on the decal -A- can be read when the CD changer is removed (depending on the vehicle equipment level). Refer to Parts Information and Removal and Installation

Note. Air guide in air conditioner and in vehicle, refer to AIR ROUTING AND DISTRIBUTION IN PASSENGER COMPARTMENT and AIR DISTRIBUTOR HOUSING DOORS AND PARTITIONS . Heating & A/C unit, removing and installing, refer to A/C UNIT . A/C Air Intake Housing, removing and installing, refer to A/C UNIT AIR INTAKE HOUSING . On this vehicle, the different motors on the A/C are adapted and controlled over a data line. The different control motors are connected in sequence to the Climatronic control module -J255- display and control head via this data line (Lin bus). The sequence differs between the different A/C versions. Refer to A/C CONTROL MOTOR BLOCK DIAGRAM and appropriate SYSTEM WIRING DIAGRAM. From 01.2008, A/C units which have an additional connection for the glove compartment cooling are being installed. On vehicles without glove compartment cooling, this connection is sealed with a plug. Refer to GLOVE COMPARTMENT COOLING TO AIR INTAKE MANIFOLD CONNECTION . Depending on the production date, there are different versions of the levers and connections on the A/C unit. Refer to AIR CONDITIONER, LEVERS AND CONNECTING ELEMENTS and the Parts Information. Revised A/C units are being installed from MY 12 (use depends on the vehicle version) (A/C unit part number "8T_ 820 005"). With the introduction of these A/C units, other control motors are also being installed, which can be installed with both versions of the A/C units (interchanging is currently permitted). Refer to the Parts Information and the Vehicle Diagnostic Tester in "Guided Fault Finding" function.

1. "Basis" A/C system and air intake housing components, refer to «A/C UNIT AND AIR INTAKE HOUSING OVERVIEW, BASIS A/C SYSTEM»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__ac-unit-and-air-intake-housing) .
2. "Comfort" A/C unit and air intake housing components, refer to «A/C UNIT AND AIR INTAKE HOUSING OVERVIEW, COMFORT A/C SYSTEM»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__ac-unit-and-air-intake-housing) .

A/C UNIT AND AIR INTAKE HOUSING OVERVIEW, BASIS A/C SYSTEM

Note. Revised A/C units are being installed from MY 12 (use depends on the vehicle version) (A/C unit part number "8T_ 820 005"). With the introduction of these A/C units, other control motors are also being installed, which can be installed with both versions of the A/C units (interchanging is currently permitted). Refer to the Parts Information and the Vehicle Diagnostic Tester in "Guided Fault Finding" function.

Scheme 248

1. Air Intake Housing Removing and installing, refer to «A/C UNIT AIR INTAKE HOUSING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__ac-unit-air-intake-housing) . Disassembling and assembling, refer to «A/C UNIT AIR INTAKE HOUSING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__ac-unit-air-intake-housing) . There are different versions (with and without a connection for the glove compartment cooling). Connection for the glove compartment cooling on the air intake manifold, refer to «GLOVE COMPARTMENT COOLING TO AIR INTAKE MANIFOLD CONNECTION»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__glove-compartment-cooling-to-air-intake) . NOTE: From 01.2008, A/C units which have an additional connection for the glove compartment cooling are being installed. On vehicles without glove compartment cooling, this connection is sealed with a plug. From MY 12 (introduction depending on the vehicle version) a revised fresh air blower control module -J126- (and fresh air blower -V2-, Climatronic control module -J255- A/C control head and A/C units with part number "8T_ 820 005") are being used. The air intake manifold, along with the fresh air blower control module -J126- and the A/C unit is also revised. Be sure to use the correct version and allocation. Refer to the Parts Information and the Vehicle Diagnostic Tester in "Guided Fault Finding" function.
2. A/C with Evaporator ("Basis" A/C system) May only be removed when refrigerant circuit has been discharged; bring vehicle to a workshop that has the necessary tools and in which the work can be performed accordingly by qualified personnel. Refer to «General Information»(/audi/a5/i-2007-2011/remont/general-servicing-all-makes/#general-technical-data-refrigerant-r134a-servicing-coupe-1-of-2__general-information) . Evaporator, removing and installing with A/C Unit installed, from Start of Production through MY 12, refer to «EVAPORATOR, A/C UNIT INSTALLED»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__evaporator-ac-unit-installed) . NOTE: Revised A/C units and evaporators are being installed from MY 12 (use depends on the vehicle version) (A/C unit part number "8T_ 820 005"). It is not possible to replace the evaporator on this A/C unit when the A/C unit is installed. See if the evaporator is available as an installation kit either without the evaporator housing or only together with the housing. Refer to the Parts Information. If the evaporator is available only together with the housing, then it is necessary to remove the A/C unit and replace the evaporator with the evaporator housing. Refer to «EVAPORATOR HOUSING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__evaporator-housing) . From the start of production through the MY 12 change-over, evaporators approximately 40 mm (1.6 in.) wide (block depth) are being installed (air conditioner part number "8K_ 820 005"). From MY 12, as a running change and depending on the version of the vehicle, an approximately 50 mm (2 in.) wide evaporator (block depth) is being installed (air conditioner part number "8T_ 820 005"). Pay attention to the correct allocation of the evaporator expansion valve (there are different versions). Refer to the Parts Information. Evaporator and evaporator housing, removing and installing, refer to «EVAPORATOR HOUSING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__evaporator-housing) . A/C unit with evaporator, removing and installing, refer to «A/C UNIT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__ac-unit) . Heating and A/C unit, disassembling and assembling, refer to «A/C UNIT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) . Clean air conditioning system evaporator with Ultrasound A/C Cleaner VAS 6189A, refer to «EVAPORATOR CLEANING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2) . NOTE: Revised A/C units are being installed from MY 12 (use depends on the vehicle version) (A/C unit part number "8T_ 820 005"). With the introduction of these A/C units, other control motors are also being installed, which can be installed with both versions of the A/C units (interchanging is currently permitted). Refer to the Parts Information and Vehicle Diagnostic Tester in "Guided Fault Finding" function.
3. Recirculation Door Motor -V113- Removing and installing, refer to «RECIRCULATION DOOR MOTOR -V113»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__recirculation-door-motor-v113) .
4. Airflow Door Motor -V71- Removing and installing, refer to «AIR FLOW DOOR MOTOR -V71»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__air-flow-door-motor-v71) .
5. Coolant Pipes To Heater Core
6. Expansion Valve Refrigerant lines with inner heat exchanger, disconnecting and reconnecting, refer to «REFRIGERANT CIRCUIT COMPONENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) . Removing and installing, refer to «EXPANSION VALVE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__expansion-valve) . NOTE: From the start of production through the MY 12 change-over, evaporators approximately 40 mm (1.6 in.) wide (block depth) are being installed (air conditioner part number "8K_ 820 005"). From MY 12, as a running change and depending on the version of the vehicle, an approximately 50 mm (2 in.) wide evaporator (block depth) is being installed (air conditioner part number "8T_ 820 005"). Pay attention to the correct allocation of the evaporator expansion valve (there are different versions). Refer to the Parts Information.
7. Grommet For sealing the opening through the plenum chamber rear wall for the refrigerant lines.
8. Cover For Refrigerant Pipes Leading To The Evaporator Removing and installing, refer to «EVAPORATOR, A/C UNIT INSTALLED»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__evaporator-ac-unit-installed) .
9. Defroster Door Motor -V107- Removing and installing, refer to «DEFROSTER DOOR MOTOR -V107»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__defroster-door-motor-v107) .
10. Footwell Door Motor -V261- Removing and installing, refer to «FOOTWELL DOOR MOTOR -V261- AND LEFT FOOTWELL DOOR MOTOR -V108»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__footwell-door-motor-v261-and-left) . Retaining plate Footwell Door Motor -V261- removing and installing, refer to «LEFT RETAINING PLATE WITH FOOTWELL DOOR MOTOR -V261»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__left-retaining-plate-with-footwell-door) .
11. Left Condensation Water Drain Connection, (Driver Side) Condensation water drain valve, checking, removing and installing, refer to «CONDENSATION WATER DRAIN HOSE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__condensation-water-drain-hose) .
12. Temperature Regulator Door Motor -V68- Removing and installing, refer to «TEMPERATURE REGULATOR DOOR MOTOR -V68- AND REAR TEMPERATURE DOOR MOTOR -V137»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__temperature-regulator-door-motor-v68-and) .
13. Footwell Outlet Temperature Sensor -G192- Removing and installing, refer to «FOOTWELL VENT TEMPERATURE SENSOR -G192- / LEFT FOOTWELL VENT TEMPERATURE SENSOR -G261»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__footwell-vent-temperature-sensor-g192) . The footwell vent temperature sensor is installed in the left footwell vent.
14. Center Outlet Temperature Sensor -G191- Removing and installing, refer to «CENTER VENT TEMPERATURE SENSOR -G191»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__center-vent-temperature-sensor-g191) . The center outlet temperature sensor is installed in the center instrument panel air guide channel.
15. Connection to the A/C Control Head Climatronic Control Module -J255- on the A/C wiring harness.
16. Fresh Air Blower Control Module -J126- Removing and installing, refer to «FRESH AIR BLOWER CONTROL MODULE -J126»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__fresh-air-blower-control-module-j126) . Check using the Vehicle Diagnostic Tester in "Guided Fault Finding" function. NOTE: As a running change in MY 10, gasoline engines that can run on bioethanol (Flex Fuel Vehicles) were introduced, which currently have an auxiliary heater heating element -Z35-. Refer to «AUXILIARY HEATER HEATING ELEMENT -Z35-, TESTING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__auxiliary-heater-heating-element-z35-testing) . Currently an auxiliary air heater heating element is installed for vehicles with a high voltage system (hybrid vehicles) and a gasoline engine. Refer to «AUXILIARY HEATER HEATING ELEMENT -Z35-, TESTING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__auxiliary-heater-heating-element-z35-testing) . The activation of the electric auxiliary heater (the auxiliary heater heating element) occurs for vehicles with a gasoline engine from the Climatronic control module -J255- control head via the local Data bus (controlled using the same outlet and also using the fresh air blower control module -J126-) on the auxiliary air heater control module -J604-. Check the fresh air blower control module or the fresh air blower and also the auxiliary air heater control module when complaints arise for these vehicles. Refer to the Vehicle Diagnostic Tester in "Guided Fault Finding" function and appropriate SYSTEM WIRING DIAGRAM. Make sure the auxiliary air heater heating element is working. Refer to «AUXILIARY HEATER HEATING ELEMENT -Z35-, TESTING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__auxiliary-heater-heating-element-z35-testing) . From MY 12 (introduction depending on the vehicle version) a revised fresh air blower control module -J126- (and fresh air blower -V2-, Climatronic control module -J255- A/C control head and A/C units with part number "8T_ 820 005") are being used. The air intake manifold, along with the fresh air blower control module and the A/C unit is also revised. Be sure to use the correct version and allocation. Refer to the Parts Information and the Vehicle Diagnostic Tester in "Guided Fault Finding" function. The fresh air blower control module does not control the fresh air blower if the Climatronic control module allocation or adaptation to fresh air blower module (part number 8K0 820 521 or 8T0 820 521) is not according to the specification. There may not always be an entry in the DTC memory even though the activation of the fresh air blower is not OK. Make sure the Climatronic control module adaptation is correct. Refer to the Parts Information and to the Vehicle Diagnostic Tester in "Guided Fault Finding" function.
17. Center Vent Adjustment Motor -V102- Removing and installing, refer to «CENTER VENT ADJUSTMENT MOTOR -V102»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__center-vent-adjustment-motor-v102) .
18. Right Condensation Water Drain Connection (Passenger Side) Condensation water drain valve, checking, removing and installing, refer to «CONDENSATION WATER DRAIN HOSE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__condensation-water-drain-hose) .
19. Evaporator A/C unit with evaporator, removing and installing, refer to «A/C UNIT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__ac-unit) . Evaporator, removing and installing with A/C Unit installed, from Start of Production through MY 12, refer to «EVAPORATOR, A/C UNIT INSTALLED»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__evaporator-ac-unit-installed) . NOTE: Revised A/C units and evaporators are being installed from MY 12 (use depends on the vehicle version) (A/C unit part number "8T_ 820 005"). It is not possible to replace the evaporator on this A/C unit when the A/C unit is installed. See if the evaporator is available as an installation kit either without the evaporator housing or only together with the housing. Refer to the Parts Information. If the evaporator is available only together with the housing, then it is necessary to remove the A/C unit and replace the evaporator with the evaporator housing. Refer to «EVAPORATOR HOUSING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__evaporator-housing) . From the start of production through the MY 12 change-over, evaporators approximately 40 mm (1.6 in.) wide (block depth) are being installed (air conditioner part number "8K_ 820 005"). From MY 12, as a running change and depending on the version of the vehicle, an approximately 50 mm (2 in.) wide evaporator (block depth) is being installed (air conditioner part number "8T_ 820 005"). Pay attention to the correct allocation of the evaporator expansion valve (there are different versions). Refer to the Parts Information. Evaporator and evaporator housing, removing and installing, refer to «EVAPORATOR HOUSING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__evaporator-housing) .
20. Heater Core for Heater Unit Heater core with the A/C installed, removing and installing, refer to «HEATER CORE/HOUSINGS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) .
21. Auxiliary Air Heater Heating Element -Z35- / Honey Comb The auxiliary heater heating element is installed on vehicles with certain gasoline engines. Refer to «AUXILIARY HEATER HEATING ELEMENT -Z35-, TESTING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__auxiliary-heater-heating-element-z35-testing) . Vehicles with gasoline engine, without auxiliary air heater heating element have a honey comb installed as a place holder (this assures that current conditions in the A/C with and without auxiliary air heater heating element are the same). Make sure the auxiliary air heater heating element is working. Refer to «AUXILIARY HEATER HEATING ELEMENT -Z35-, TESTING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__auxiliary-heater-heating-element-z35-testing) . Auxiliary air heater heating element / honey comb with A/C system installed, removing and installing, refer to «AUXILIARY AIR HEATER HEATING ELEMENT -Z35- / HONEY COMB»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__auxiliary-air-heater-heating-element-z35) . NOTE: In MY 2009, as a running change, a new version of the auxiliary air heater heating element is being installed (the heating element is a bit more narrow); be sure to use the correct version and note the allocation. Refer to Electronic Parts Information (ETKA). As a running change in MY 10, gasoline engines that can run on bioethanol (Flex Fuel Vehicles) were introduced, which currently have an auxiliary air heater heating element. Refer to «AUXILIARY HEATER HEATING ELEMENT -Z35-, TESTING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__auxiliary-heater-heating-element-z35-testing) . Currently an auxiliary air heater heating element is installed for vehicles with a high voltage system (hybrid vehicles) and a gasoline engine «AUXILIARY HEATER HEATING ELEMENT -Z35-, TESTING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__auxiliary-heater-heating-element-z35-testing) .
22. Fresh Air Blower -V2- Removing and installing, refer to «FRESH AIR BLOWER -V2»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__fresh-air-blower-v2) . Check using the Vehicle Diagnostic Tester in "Guided Fault Finding" function. NOTE: Different versions. Refer to «FRESH AIR BLOWER -V2»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__fresh-air-blower-v2) . As a running change in MY 10, gasoline engines that can run on bioethanol (Flex Fuel Vehicles) were introduced, which currently have an auxiliary heater heating element -Z35-. Refer to «AUXILIARY HEATER HEATING ELEMENT -Z35-, TESTING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__auxiliary-heater-heating-element-z35-testing) . Currently an auxiliary air heater heating element is installed for vehicles with a high voltage system (hybrid vehicles) and a gasoline engine «AUXILIARY HEATER HEATING ELEMENT -Z35-, TESTING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__auxiliary-heater-heating-element-z35-testing) . The activation of the electric auxiliary heater (the auxiliary air heater heating element) occurs for vehicles with a gasoline engine from the Climatronic control module -J255- control head via the local Data bus (controlled using the same outlet and also using the fresh air blower control module -J126-) on the auxiliary air heater heating element. Check the fresh air blower control module or the fresh air blower and also the auxiliary air heater control module -J604- when complaints arise for these vehicles. Refer to the Vehicle Diagnostic Tester in "Guided Fault Finding" function and appropriate SYSTEM WIRING DIAGRAM. Make sure the auxiliary air heater heating element is working. Refer to «AUXILIARY HEATER HEATING ELEMENT -Z35-, TESTING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__auxiliary-heater-heating-element-z35-testing) . From MY 12 (depending on the version of the vehicle) revised fresh air blower control module -J126-, fresh air blower -V2-, Climatronic control module -J255- A/C control head and A/C units with part number "8T_ 820 005" are being used. Be sure to use the correct version and allocation. Refer to the Parts Information and the Vehicle Diagnostic Tester in "Guided Fault Finding" function. The fresh air blower control module does not control the fresh air blower if the Climatronic control module allocation or adaptation to fresh air blower module (part number 8K0 820 521 or 8T0 820 521) is not according to the specification. There may not always be an entry in the DTC memory even though the activation of the fresh air blower is not OK. Make sure the Climatronic control module adaptation is correct. Refer to the Parts Information and to the Vehicle Diagnostic Tester in "Guided Fault Finding" function.
23. Dust and Pollen Filter Removing and installing, refer to «DUST AND POLLEN FILTER»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__dust-and-pollen-filter) . Follow the replacement intervals. Refer to «Maintenance, Diagnosis»(/audi/a5/i-2007-2011/remont/procedures/#how-to-diagnosis-the-maintenance-maintenance-intervals-coupe) . Different versions with and without activated charcoal filter element. Refer to «DUST AND POLLEN FILTER WITH ACTIVATED CHARCOAL INSERT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__dust-and-pollen-filter-with-activated) and the Electronic Parts Information (ETKA).
24. Evaporator Vent Temperature Sensor -G263- Removing and installing, refer to «EVAPORATOR VENT TEMPERATURE SENSOR -G263»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) .

A/C UNIT AND AIR INTAKE HOUSING OVERVIEW, COMFORT A/C SYSTEM

Note. From MY 12 (introduction depending on the version of the vehicle), a revised fresh air blower control module -J126- (and fresh air blower -V2-, Climatronic control module -J255- A/C control head, evaporator, expansion valves, motors and A/C are being used. Refer to the Parts Information and the Vehicle Diagnostic Tester in "Guided Fault Finding" function. Read all the information regarding these components. Refer to A/C UNIT AND AIR INTAKE HOUSING OVERVIEW, BASIS A/C SYSTEM .

Scheme 249

1. Air Intake Housing Removing and installing, refer to «A/C UNIT AIR INTAKE HOUSING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__ac-unit-air-intake-housing) . Disassembling and assembling, refer to «A/C UNIT AIR INTAKE HOUSING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__ac-unit-air-intake-housing) . There are different versions (with and without a connection for the glove compartment cooling). Connection for the glove compartment cooling on the air intake manifold, refer to «GLOVE COMPARTMENT COOLING TO AIR INTAKE MANIFOLD CONNECTION»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__glove-compartment-cooling-to-air-intake) . NOTE: From 01.2008, A/C units which have an additional connection for the glove compartment cooling are being installed. On vehicles without glove compartment cooling, this connection is sealed with a plug. From MY 12, a new version is being used. Read all the information regarding this component. Refer to «A/C UNIT AND AIR INTAKE HOUSING OVERVIEW, BASIS A/C SYSTEM»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__ac-unit-and-air-intake-housing) .
2. A/C with Evaporator ("Comfort" A/C System) May only be removed when refrigerant circuit has been removed; bring vehicle to a workshop that has the necessary tools and in which the work can be performed accordingly by qualified personnel. «General Information»(/audi/a5/i-2007-2011/remont/general-servicing-all-makes/#general-technical-data-refrigerant-r134a-servicing-coupe-1-of-2__general-information) . Evaporator, removing and installing with A/C Unit installed, from Start of Production through MY 12, refer to «EVAPORATOR, A/C UNIT INSTALLED»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__evaporator-ac-unit-installed) . NOTE: From MY 12, a new version is being used. Read all the information regarding this component. Refer to «A/C UNIT AND AIR INTAKE HOUSING OVERVIEW, BASIS A/C SYSTEM»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__ac-unit-and-air-intake-housing) . Evaporator and evaporator housing, removing and installing, refer to «EVAPORATOR HOUSING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__evaporator-housing) . A/C unit with evaporator, removing and installing, refer to «A/C UNIT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__ac-unit) . Heating and A/C unit, disassembling and assembling, refer to «A/C UNIT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) . Clean air conditioning system evaporator with Ultrasound A/C Cleaner VAS 6189A, refer to «EVAPORATOR CLEANING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2) .
3. Recirculation Door Motor -V113- Removing and installing, refer to «RECIRCULATION DOOR MOTOR -V113»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__recirculation-door-motor-v113) .
4. Airflow Door Motor -V71- Removing and installing, refer to «AIR FLOW DOOR MOTOR -V71»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__air-flow-door-motor-v71) .
5. Coolant Pipes To Heater Core
6. Expansion Valve Refrigerant lines, disconnecting and reconnecting, refer to «REFRIGERANT CIRCUIT COMPONENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) . Removing and installing, refer to «EXPANSION VALVE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__expansion-valve) . NOTE: From MY 12, a new version is being used. Read all the information regarding this component. Refer to «A/C UNIT AND AIR INTAKE HOUSING OVERVIEW, BASIS A/C SYSTEM»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__ac-unit-and-air-intake-housing) .
7. Grommet For sealing the opening through the plenum chamber rear wall for the refrigerant lines.
8. Left Temperature Door Motor -V158- Removing and installing, refer to «LEFT TEMPERATURE DOOR MOTOR -V158»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__left-temperature-door-motor-v158) .
9. Cover For Refrigerant Pipes Leading To The Evaporator Removing and installing, refer to «EVAPORATOR, A/C UNIT INSTALLED»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__evaporator-ac-unit-installed) .
10. Left Center Vent Motor -V110- Removing and installing, refer to «LEFT CENTER VENT MOTOR -V110»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__left-center-vent-motor-v110) . Left retaining plate with footwell door motor -V108- and left center vent motor, removing and installing, refer to «LEFT RETAINING PLATE WITH LEFT FOOTWELL DOOR MOTOR -V108- AND LEFT CENTER VENT MOTOR -V110»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__left-retaining-plate-with-left-footwell) . Left center vent motor, removing and installing, refer to «LEFT CENTER VENT MOTOR -V110»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__left-center-vent-motor-v110) .
11. Defroster Door Motor -V107- Removing and installing, refer to «DEFROSTER DOOR MOTOR -V107»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__defroster-door-motor-v107) .
12. Left Footwell Door Motor -V108- Removing and installing, refer to «FOOTWELL DOOR MOTOR -V261- AND LEFT FOOTWELL DOOR MOTOR -V108»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__footwell-door-motor-v261-and-left) . Left retaining plate with Footwell door motor and left center vent motor -V110- removing and installing, refer to «LEFT RETAINING PLATE WITH LEFT FOOTWELL DOOR MOTOR -V108- AND LEFT CENTER VENT MOTOR -V110»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__left-retaining-plate-with-left-footwell) .
13. Left Condensation Water Drain Connection, (Driver Side) Condensation water drain valve, checking, removing and installing, refer to «CONDENSATION WATER DRAIN HOSE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__condensation-water-drain-hose) .
14. Rear Temperature Regulator Door Motor -V137- Removing and installing, refer to «TEMPERATURE REGULATOR DOOR MOTOR -V68- AND REAR TEMPERATURE DOOR MOTOR -V137»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__temperature-regulator-door-motor-v68-and) .
15. Left Footwell Vent Temperature Sensor -G261- Removing and installing, refer to «FOOTWELL VENT TEMPERATURE SENSOR -G192- / LEFT FOOTWELL VENT TEMPERATURE SENSOR -G261»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__footwell-vent-temperature-sensor-g192) . The left footwell vent temperature sensor is installed in the left footwell vent.
16. Connection to the A/C Control Head Climatronic Control Module -J255- on the A/C wiring harness.
17. Right Footwell Vent Temperature Sensor -G262- Removing and installing, refer to «RIGHT FOOTWELL VENT TEMPERATURE SENSOR -G262»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__right-footwell-vent-temperature-sensor-g262) . The right footwell vent temperature sensor is installed in the right footwell vent.
18. Fresh Air Blower Control Module -J126- Removing and installing, refer to «FRESH AIR BLOWER CONTROL MODULE -J126»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__fresh-air-blower-control-module-j126) . Check using the Vehicle Diagnostic Tester in "Guided Fault Finding" function. NOTE: Different versions. Refer to «FRESH AIR BLOWER -V2»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__fresh-air-blower-v2) . As a running change in MY 10, gasoline engines that can run on bioethanol (Flex Fuel Vehicles) were introduced, which currently have an auxiliary heater heating element -Z35-. Refer to «AUXILIARY HEATER HEATING ELEMENT -Z35-, TESTING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__auxiliary-heater-heating-element-z35-testing) . Currently an auxiliary air heater heating element is installed for vehicles with a high voltage system (hybrid vehicles) and a gasoline engine «AUXILIARY HEATER HEATING ELEMENT -Z35-, TESTING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__auxiliary-heater-heating-element-z35-testing) . The activation of the electric auxiliary heater (the auxiliary air heater heating element) occurs for vehicles with a gasoline engine from the Climatronic control module -J255- control head via the local Data bus (controlled using the same outlet and also using the fresh air blower control module -J126-) on the auxiliary air heater control module -J604-. Check the fresh air blower control module or the fresh air blower -V2- and also the auxiliary air heater control module when complaints arise for these vehicles. Refer to the Vehicle Diagnostic Tester in "Guided Fault Finding" function and appropriate SYSTEM WIRING DIAGRAM. Make sure the auxiliary air heater heating element is working. Refer to «AUXILIARY HEATER HEATING ELEMENT -Z35-, TESTING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__auxiliary-heater-heating-element-z35-testing) . From MY 12, a new version is being used. Read all the information regarding this component. Refer to «A/C UNIT AND AIR INTAKE HOUSING OVERVIEW, BASIS A/C SYSTEM»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__ac-unit-and-air-intake-housing) .
19. Evaporator A/C unit with evaporator, removing and installing, refer to «A/C UNIT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__ac-unit) . Evaporator, removing and installing with A/C Unit installed, from Start of Production through MY 12, refer to «EVAPORATOR, A/C UNIT INSTALLED»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__evaporator-ac-unit-installed) . NOTE: From MY 12, a new version is being used. Read all the information regarding this component. Refer to «A/C UNIT AND AIR INTAKE HOUSING OVERVIEW, BASIS A/C SYSTEM»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__ac-unit-and-air-intake-housing) . Evaporator and evaporator housing, removing and installing, refer to «EVAPORATOR HOUSING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__evaporator-housing) .
20. Right Condensation Water Drain Connection (Passenger Side) Condensation water drain valve, checking, removing and installing, refer to «CONDENSATION WATER DRAIN HOSE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__condensation-water-drain-hose) .
21. Heater Core for Heater Unit Heater core with the A/C installed, removing and installing, refer to «HEATER CORE/HOUSINGS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) .
22. Auxiliary Air Heater Heating Element -Z35- / Honey Comb The auxiliary heater heating element is installed on vehicles with certain gasoline engines. Refer to «AUXILIARY HEATER HEATING ELEMENT -Z35-, TESTING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__auxiliary-heater-heating-element-z35-testing) . Vehicles with a gasoline engine, without auxiliary heater heating element have a honey comb installed in the as a place holder (this assures that current conditions in the A/C with and without auxiliary heater heating element are the same). Make sure the auxiliary heater heating element is working. Refer to «AUXILIARY HEATER HEATING ELEMENT -Z35-, TESTING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__auxiliary-heater-heating-element-z35-testing) . Auxiliary heater heating element / honey comb with A/C system installed, removing and installing, refer to «AUXILIARY AIR HEATER HEATING ELEMENT -Z35- / HONEY COMB»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__auxiliary-air-heater-heating-element-z35) . NOTE: In MY 2009, as a running change, a new version of the auxiliary heater heating element is being installed (the heating element is a bit more narrow); be sure to use the correct version and note the allocation. Refer to Electronic Parts Information (ETKA). As a running change in MY 10, gasoline engines that can run on bioethanol (Flex Fuel Vehicles) were introduced, which currently have an auxiliary heater heating element. Refer to «AUXILIARY HEATER HEATING ELEMENT -Z35-, TESTING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__auxiliary-heater-heating-element-z35-testing) . Currently an auxiliary air heater heating element is installed for vehicles with a high voltage system (hybrid vehicles) and a gasoline engine «AUXILIARY HEATER HEATING ELEMENT -Z35-, TESTING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__auxiliary-heater-heating-element-z35-testing) .
23. Right Temperature Door Motor -V159- Removing and installing, refer to «RIGHT TEMPERATURE DOOR MOTOR -V159»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__right-temperature-door-motor-v159) .
24. Right Center Vent Motor -V111- Removing and installing, refer to «RIGHT CENTER VENT MOTOR -V111»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__right-center-vent-motor-v111) . Right footwell door motor retaining plate with the control motors and right center vent motor removing and installing, refer to «RIGHT RETAINING PLATE WITH RIGHT FOOTWELL DOOR MOTOR -V109- AND RIGHT CENTER VENT MOTOR -V111»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__right-retaining-plate-with-right-footwell) .
25. Right Footwell Door Motor -V109- Removing and installing, refer to «RIGHT FOOTWELL DOOR MOTOR -V109»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__right-footwell-door-motor-v109) . Right footwell door motor retaining plate with the control motors and right center vent motor removing and installing, refer to «RIGHT RETAINING PLATE WITH RIGHT FOOTWELL DOOR MOTOR -V109- AND RIGHT CENTER VENT MOTOR -V111»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__right-retaining-plate-with-right-footwell) .
26. Fresh Air Blower -V2- Removing and installing, refer to «FRESH AIR BLOWER -V2»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__fresh-air-blower-v2) . Check using the Vehicle Diagnostic Tester in "Guided Fault Finding" function. NOTE: Different versions. Refer to «FRESH AIR BLOWER -V2»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__fresh-air-blower-v2) . From MY 12, a new version is being used. Read all the information regarding this component. Refer to «A/C UNIT AND AIR INTAKE HOUSING OVERVIEW, BASIS A/C SYSTEM»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__ac-unit-and-air-intake-housing) .
27. Dust and Pollen Filter Removing and installing, refer to «DUST AND POLLEN FILTER»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__dust-and-pollen-filter) . Follow the replacement intervals. Refer to «Maintenance, Diagnosis»(/audi/a5/i-2007-2011/remont/procedures/#how-to-diagnosis-the-maintenance-maintenance-intervals-coupe) . Different versions with and without activated charcoal filter element. Refer to «DUST AND POLLEN FILTER WITH ACTIVATED CHARCOAL INSERT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__dust-and-pollen-filter-with-activated) .
28. Evaporator Vent Temperature Sensor -G263- Removing and installing, refer to «EVAPORATOR VENT TEMPERATURE SENSOR -G263»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) .

AIR GUIDES FOR BATTERY COOLING MODULE OVERVIEW

With high voltage systems (hybrid vehicles)

Read and follow all of the supplemental warnings for all work performed on vehicles with the high voltage system. Refer to HIGH VOLTAGE SYSTEM (HYBRID VEHICLES) REPAIRS

If it is necessary for the following procedure to perform work in the vicinity of high voltage components, perform a visual inspection of the high voltage components and cables for damages. Refer to VISUAL INSPECTION OF HIGH-VOLTAGE COMPONENTS AND CABLES FOR DAMAGE .

Additional work

Turn off the ignition.

Remove the luggage compartment floor (various versions). Refer to Removal and Installation .

1. Check for damage to the high voltage components and cables after removing the luggage compartment floor. Refer to «VISUAL INSPECTION OF HIGH-VOLTAGE COMPONENTS AND CABLES FOR DAMAGE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__visual-inspection-of-high-voltage-components-and) .
2. Make sure that the components and cables are not damaged when working in the area of high voltage components and cables.
3. Perform a visual inspection of the high voltage components and cables after finishing work on and before installing the luggage compartment floor panel.

Air Guides on Battery Cooling Module

Scheme 250

1. Inlet (Lower) Air Guide for the Traction Battery Removing and installing, refer to «TRACTION BATTERY INLET AIR GUIDE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__traction-battery-inlet-air-guide) . Attach the air guide to the battery cooling module using one bolt and to the air guide using several bolts if the retainers no longer hold or one of the tabs breaks off.
2. Front Outlet (Upper) Air Guide for Traction Battery Removing and installing, refer to «TRACTION BATTERY FRONT OUTLET AIR GUIDE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__traction-battery-front-outlet-air-guide) . Use several bolts to attach the air guide to the battery cooling module if the retainer no longer holds or one of the tabs breaks off.
3. Left Air Guide to Traction Battery Removing and installing, refer to «TRACTION BATTERY LEFT AND RIGHT AIR GUIDES»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__traction-battery-left-and-right-air) . Use an additional bolt to attach the air guide if the retainers no long hold. It will be necessary to remove the traction battery to do this. .
4. Screw Use an additional bolt to attach the air guide if the retainers no longer hold. It will be necessary to remove the traction battery to do this. Refer to REMOVAL AND INSTALLATION .
5. Traction Battery -A2- Traction battery -A2-, removing and installing, vehicle, de-energizing, refer to REMOVAL AND INSTALLATION .
6. Right Air Guide to Traction Battery Removing and installing, refer to «TRACTION BATTERY LEFT AND RIGHT AIR GUIDES»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__traction-battery-left-and-right-air) . Use an additional bolt to attach the air guide if the retainers no long hold. It will be necessary to remove the traction battery to do this. Refer to REMOVAL AND INSTALLATION .
7. Screw Use an additional bolt to attach the air guide if the retainers no longer hold. It will be necessary to remove the traction battery to do this. Refer to REMOVAL AND INSTALLATION .
8. Screw Use an additional bolt to attach the air guide if the retainers no longer hold.
9. Screw Use an additional bolt to attach the air guide if the retainers no longer hold.
10. Battery Cooling Module
11. Screw Use an additional bolt to attach the air guide if the retainers no longer hold.
12. Rear Outlet Air Guide for the Traction Battery Removing and installing, refer to «TRACTION BATTERY REAR OUTLET AIR GUIDE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__traction-battery-rear-outlet-air-guide) . Use several bolts to attach the air guide to the battery cooling module if one of the tabs breaks off.

AIR DISTRIBUTOR HOUSING DOORS AND PARTITIONS

Note. The air distribution housing cannot be disassembled. Refer to the Parts Information. There are different versions of the air distribution housing depending on which A/C system is installed in the vehicle, "Comfort" or "Basis". Refer to the Parts Information. Depending on the production date, there are different versions of the levers and connections on the A/C unit. Refer to AIR CONDITIONER, LEVERS AND CONNECTING ELEMENTS and the Parts Information.

Air Distribution Housing "Basis" A/C system

Scheme 251

1. Air Distribution Housing "Basis" A/C System Complete, do not disassemble
2. Left Housing Half
3. Right Housing Half
4. Lever
5. Door In The "Defrost" Vent
6. Shaft
7. Connecting Rod
8. Door In The Vent Leading To The Center Instrument Panel Vents
9. Vent Door Leading To The Left Instrument Panel Vent
10. Connecting Rod
11. Vent Door Leading To The Right Instrument Panel Vent
12. Vent Door Leading To The Front Left Footwell Vent
13. Connecting Rod
14. Vent Door Leading To The Front Right Footwell Vent
15. Lever
16. Lever
17. Lever
18. Vent Door Leading To The Rear Left Footwell Vent
19. Shaft
20. Vent Door Leading To The Rear Right Footwell Vent

Air Distribution Housing "Comfort" A/C System

Scheme 252

1. Air Distribution Housing "Comfort" A/C System Complete, do not disassemble. NOTE: Beginning 08.2007, as a running change, an A/C unit with an air distribution housing with optimized air flow will be introduced (versions "1" and "2"). Refer to «COMFORT A/C UNIT AND AIR DISTRIBUTION HOUSING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__comfort-ac-unit-and-air-distribution) .
2. Left Housing Half
3. Right Housing Half
4. Upper Housing For Vents
5. Lever
6. Lever
7. Door For Left Indirect Ventilation Vent
8. Door In The "Defrost" Vent
9. Door For Right Indirect Ventilation Vent
10. Lever
11. Lever
12. Vent Door Leading To The Left Instrument Panel Vent
13. Vent Door Leading To The Front Left Footwell Vent
14. Lever
15. Lever
16. Vent Door Leading To The Rear Left Footwell Vent
17. Lever
18. Vent Door Leading To The Right Instrument Panel Vent
19. Vent Door Leading To The Front Right Footwell Vent
20. Lever
21. Lever
22. Vent Door Leading To The Rear Right Footwell Vent
23. Shaft
24. Shaft
25. Connecting Rod
26. Connecting Rod
27. Connecting Rod
28. Connecting Rod
29. Separator Wall If the air flow to the front and rear vents is separated from each other; the requirement for different front and rear air temperatures (depends on the setting of each temperature door).
30. Grommet Glued in the separating wall, item 29 «AIR DISTRIBUTOR HOUSING DOORS AND PARTITIONS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__air-distributor-housing-doors-and-partitions)
31. Grommet Glued in the separating wall, item 29 «AIR DISTRIBUTOR HOUSING DOORS AND PARTITIONS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__air-distributor-housing-doors-and-partitions)
32. Door In The Vent Leading To The Left Center Instrument Panel Vents
33. Door In The Vent Leading To The Right Center Instrument Panel Vents
34. Separator Wall If the air flow to the left and right vents is separated from each other; the requirement for different front and rear air temperatures (depends on the setting of each temperature door).
35. Vent Door Leading To The Rear Right Center Console Vent
36. Vent Door Leading To The Rear Right Center Console Vent

OVERVIEW

Note. Component locations of individual components, refer to COMPONENTS INSIDE PASSENGER COMPARTMENT OVERVIEW and A/C UNIT AND AIR INTAKE HOUSING COMPONENTS . The ventilation of the passenger compartment occurs via two air extraction outlets (in luggage compartment right and left near the bumper), refer to PASSENGER COMPARTMENT FORCED AIR EXTRACTION . The air guide and the air distribution in the passenger compartment is different on vehicle equipped with the "Comfort" A/C system and the "Basis" A/C system. From 01.2008, A/C units which have an additional connection for the glove compartment cooling are being installed. On vehicles without glove compartment cooling, this connection is sealed with a plug. Refer to GLOVE COMPARTMENT COOLING TO AIR INTAKE MANIFOLD CONNECTION . The following illustrations show the location of the components on an Audi A5 Coupe; an Audi A5 Sportback, Audi A4, Audi Q5 etc., the location of the components varies slightly. The description of the components is not different; removing and installing is performed in the same way as on the Audi A5 Coupe.

Scheme 253

1. Defroster Vent/Front Window Air duct to windshield Removing and installing, refer to Instrument panel in «Removal and Installation»(/audi/a5/i-2007-2011/remont/exteriorinterior-trim/#interior-trim-coupe) . If the intermediate piece air flow / defrost (item 8 8 and item 7 7 ) was crushed or crumpled when the dash panel was being installed, then the air flow to the windshield will be uneven or insufficient. Refer to Instrument panel in «Removal and Installation»(/audi/a5/i-2007-2011/remont/exteriorinterior-trim/#interior-trim-coupe) .
2. Vents for Indirect Ventilation Installed only in vehicles with "Comfort" version A/C system Air flows out of these vents on vehicles equipped with the "Comfort" A/C system. The opening in the A/C unit is sealed (different A/C versions) on vehicles equipped with the "Basis" A/C system.
3. Instrument Panel With air ducts to defroster vents and various instrument panel vents. Different versions, depending on the ("Comfort" and "Basis" A/C systems). Refer to Electronic Parts Information (ETKA). Removing and installing, refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/exteriorinterior-trim/#interior-trim-coupe) .
4. Defroster Vent/Right Side Window Removing and installing, refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/exteriorinterior-trim/#interior-trim-coupe)
5. Instrument Panel Vent, Right Removing and installing instrument panel vents, refer to «INSTRUMENT PANEL VENTS AND REAR VENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__instrument-panel-vents-and-rear-vents) and «Removal and Installation»(/audi/a5/i-2007-2011/remont/exteriorinterior-trim/#interior-trim-coupe) .
6. Air Guide / Dash Panel With air ducts to defroster vents and various instrument panel vents. Different versions, depending on the ("Comfort" and "Basis" A/C systems). Refer to Electronic Parts Information (ETKA). The air guide is part of the dash panel item 3 «INSTRUMENT PANEL CENTER VENT AIR DUCT PLUG, INSTALLING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__instrument-panel-center-vent-air-duct) and cannot be replaced individually. Refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/exteriorinterior-trim/#interior-trim-coupe) . Instrument panel, removing and installing, refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/exteriorinterior-trim/#interior-trim-coupe) .
7. Intermediate Piece Air Guide / Defrost ("Basis") Different versions, depending on the ("Comfort" and "Basis" A/C systems). Refer to Electronic Parts Information (ETKA). Removing and installing, refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/exteriorinterior-trim/#interior-trim-coupe) . If the intermediate piece air flow / defrost (and) was crushed or crumpled when the dash panel was being installed, then the air flow to the windshield will be uneven or insufficient. Refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/exteriorinterior-trim/#interior-trim-coupe) .
8. Intermediate Piece Air Guide / Defrost ("Comfort") Different versions, depending on the ("Comfort" and "Basis" A/C systems). Refer to Electronic Parts Information (ETKA). Removing and installing, refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/exteriorinterior-trim/#interior-trim-coupe) . If the intermediate piece air flow / defrost (and) was crushed or crumpled when the dash panel was being installed, then the air flow to the windshield will be uneven or insufficient. Refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/exteriorinterior-trim/#interior-trim-coupe) .
9. Air Duct To The Right Instrument Panel Vent Removing and installing, refer to «A/C UNIT AIR INTAKE HOUSING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__ac-unit-air-intake-housing) .
10. Air Duct To The Right Instrument Panel Vent Removing and installing, refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/exteriorinterior-trim/#interior-trim-coupe)
11. Fresh Air Intake The air is extracted out of the plenum chamber. Refer to «FRESH AIR INTAKE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__fresh-air-intake) .
12. A/C Unit With Air Intake Housing There are different versions depending on the A/C system installed ("Comfort" and "Basis"). Refer to «A/C UNIT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) and to the Parts Information. Heating and A/C unit, removing and installing, refer to «A/C UNIT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__ac-unit) . Air intake housing, removing and installing, refer to «A/C UNIT AIR INTAKE HOUSING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__ac-unit-air-intake-housing) . Air intake and outlet openings, refer to «AIR INTAKE AND OUTLET OPENINGS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__air-intake-and-outlet-openings) . Air routing in air intake housing and A/C unit, refer to «AIR ROUTING IN AIR INTAKE HOUSING AND A/C UNIT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__air-routing-in-air-intake-housing) . Temperature doors in the left and right heater core housing, refer to «HEATER CORE HOUSING TEMPERATURE DOORS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__heater-core-housing-temperature-doors) .
13. Removing Air From The Passenger Compartment (In Recirculating Air Mode) The air is taken from the passenger footwell under the glove compartment.
14. Right Front Footwell Vent Removing and installing, refer to «RIGHT FOOTWELL VENT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__right-footwell-vent) .
15. Air Guide To The Rear Vents Different versions, depending on the ("Comfort" and "Basis" A/C systems). Refer to Electronic Parts Information (ETKA). On vehicles equipped with the "Basis" A/C system, there is no air guide and no vents in the rear center console. NOTE: This air guide is attached to the air outlet openings in the air conditioner. There are slits inside the air guide. If the flap position is incorrect, especially on vehicles with the "Comfort" A/C system, whistling noise can come from these slits. The upper slits are covered with tape during production (running change from February 2009). Refer to «REAR VENT AIR GUIDE SLOTS, SEALING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__rear-vent-air-guide-slots-sealing) .
16. Air Duct To Rear Right Footwell Vent Removing and installing, removing carpet, refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/exteriorinterior-trim/#interior-trim-coupe) .
17. Right Rear Footwell Vent The air flows out from under the front passenger seat. Removing and installing, removing carpet, refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/exteriorinterior-trim/#interior-trim-coupe) . NOTE: The right rear footwell vent can be removed without having to remove the carpet; just separate the connecting rib on the carpet. Secure the connecting rib again with a suitable adhesive after installing the footwell vent.
18. Air Guide To Vent In Rear Center Console Removing and installing, rear center console, refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/seats/#interior-equipment-coupe) . Installed only in the "Comfort" A/C system.
19. Air Guide To Vent In Rear Center Console Removing and Installing, Rear Center Console, Removing, refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/seats/#interior-equipment-coupe) . Installed only in the "Comfort" A/C system.
20. Vent In Center Console, Rear Removing and installing, refer to «INSTRUMENT PANEL VENTS AND REAR VENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__instrument-panel-vents-and-rear-vents) and «Removal and Installation»(/audi/a5/i-2007-2011/remont/seats/#interior-equipment-coupe) . Installed only on the "Comfort" A/C system (on the "Basis" A/C system, the opening in the center console is sealed). With Rear Temperature Selection Potentiometer -G538-, The Rear Temperature Selection Potentiometer -G538- is part of the vent; cannot be replaced separately. Refer to Electronic Parts Information (ETKA).
21. Left Rear Footwell Vent The air flows out under the driver's seat. Removing and installing, removing carpet, refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/exteriorinterior-trim/#interior-trim-coupe) . NOTE: The left rear footwell vent can be removed without having to remove the carpet; just separate the connecting rib on the carpet. Secure the connecting rib again with a suitable adhesive after installing the footwell vent.
22. Air Duct To Rear Left Footwell Vent Removing and installing, removing carpet, refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/exteriorinterior-trim/#interior-trim-coupe) .
23. Left Front Footwell Vent Removing and installing, refer to «LEFT FOOTWELL VENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__left-footwell-vents) .
24. Air Duct To The "Center" Instrument Panel Vent On vehicle equipped with the "Basis" A/C system, the Center Outlet Temperature Sensor -G191- is installed in this air guide. Refer to «CENTER VENT TEMPERATURE SENSOR -G191»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__center-vent-temperature-sensor-g191) . On vehicles equipped with the "Comfort" A/C system, the Center Outlet Temperature Sensor -G191- opening in the air guide is sealed with a grommet (the Center Outlet Temperature Sensor -G191- is not installed here). Refer to Electronic Parts Information (ETKA). NOTE: This air guide has an opening. At certain setting, whistling noises may be present at this opening. Therefore, this opening is sealed with a plug at the factory (running change from February 2009). Refer to «INSTRUMENT PANEL CENTER VENT AIR DUCT PLUG, INSTALLING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__instrument-panel-center-vent-air-duct) .
25. Air Duct To The Left Instrument Panel Vent Removing and installing, refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/exteriorinterior-trim/#interior-trim-coupe) .
26. Air Duct To The Left Instrument Panel Vent Removing and installing, refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/exteriorinterior-trim/#interior-trim-coupe) .
27. Instrument Panel Vent, Center Removing and installing instrument panel vents, refer to «INSTRUMENT PANEL VENTS AND REAR VENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__instrument-panel-vents-and-rear-vents) and «Removal and Installation»(/audi/a5/i-2007-2011/remont/exteriorinterior-trim/#interior-trim-coupe) .
28. Instrument Panel Vent, Left Removing and installing instrument panel vents, refer to «INSTRUMENT PANEL VENTS AND REAR VENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__instrument-panel-vents-and-rear-vents) and «Removal and Installation»(/audi/a5/i-2007-2011/remont/exteriorinterior-trim/#interior-trim-coupe) .
29. Defroster Vent/Left Side Window Removing and installing, refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/exteriorinterior-trim/#interior-trim-coupe)

REAR VENT AIR GUIDE SLOTS, SEALING

Note. This air guide is attached to the air outlet openings in the air conditioner. There are slits inside the air guide. If the flap position is incorrect, especially on vehicles with the "Comfort" A/C system, whistling noise can come from these slits. The upper slits are covered with tape during production (running change from February 2009).

Cover the upper center console to prevent damage.

Remove the radio / multimedia control head -E380-. Refer to Removal and Installation .

Remove the Climatronic control module -J255- A/C control head. Refer to CLIMATRONIC CONTROL MODULE -J255- A/C CONTROL HEAD .

Remove the front information display control head control module -J523- if equipped. Refer to Removal and Installation .

Reach into the opening in the center console and cover both slits at the top -A- of the air guide -C- with adhesive tape -B- (approximately 2 cm x 4 cm, made of air-tight material).

Scheme 254

Note. The slots -A- are covered by the brace -D-. Cut two adhesive strips from the insulation (replacement part number 8E0 260 329) -B- Refer to the Parts Information.

INSTRUMENT PANEL CENTER VENT AIR DUCT PLUG, INSTALLING

Note. This air guide has an opening. At certain setting, whistling noises may be present at this opening. Therefore, this opening is sealed with a plug at the factory (running change from February 2009).

Cover the upper center console to prevent damage.

Remove the front information display control head control module -J685-. Refer to Removal and Installation .

Reach into the opening in the instrument panel and install the plug -B- into the opening in the air guide -A-.

Scheme 255

Make sure the plug -B- fits tightly inside the opening -A-.

Note. The illustration shows the opening -A- on an Audi A4. On the Audi Q5 is covered by a brace and is difficult to reach. The plug -B- is a replacement part (replacement part number: 8K9 805 673 C). Refer to the Parts Information.

AIR ROUTING IN AIR INTAKE HOUSING AND A/C UNIT

Note. This illustration shows the "Comfort" A/C system; some components are not part of the "Basis" A/C system. The activation of the different doors in the vents and the temperature doors differs between the "Basis" and "Comfort" A/C systems In order to show the air flow in the air intake house and in the A/C unit, both these components are shown cut open through the "A - A" and "B - B" lines. From 01.2008, A/C units which have an additional connection for the glove compartment cooling are being installed. On vehicles without glove compartment cooling, this connection is sealed with a plug. Refer to GLOVE COMPARTMENT COOLING TO AIR INTAKE MANIFOLD CONNECTION . This illustration shows the A/C without a connection for glove compartment cooling. On vehicles with glove compartment cooling, the cooled air comes directly past the evaporator into the glove compartment item 8 AIR ROUTING IN AIR INTAKE HOUSING AND A/C UNIT .

Scheme 256

1. Air Conditioner Unit There are different versions depending on the A/C system installed ("Comfort" and "Basis"). Refer to «A/C UNIT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) and to the Parts Information.
2. Air Intake Housing
3. Fresh Air Intake The air is extracted out of the plenum chamber. Refer to «FRESH AIR INTAKE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__fresh-air-intake) .
4. Removing Air From The Passenger Compartment (In Recirculating Air Mode) The air is drawn out of the front passenger footwell when the air recirculation flap under the glove compartment is open. In this illustration, the air recirculation door is shown in the "closed" position.
5. Fresh Air Blower -V2
6. Dust and Pollen Filter There are different versions of the dust and pollen filter (without and with filter insert with activated charcoal). Refer to «DUST AND POLLEN FILTER WITH ACTIVATED CHARCOAL INSERT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__dust-and-pollen-filter-with-activated) and the Parts Information.
7. Air Intake Housing Lower Section (With Installation Components) This illustration shows the air intake housing sectioned by the "A - A " line.
8. Evaporator
9. Lower Part Of The A/C Unit (With Installation Components) This illustration shows the air intake housing sectioned by the "A - A " line.
10. Temperature Door For The Front Right Vent In this illustration, the temperature door is shown in the "heat" position. On the "Comfort" A/C system, the front right and left temperature doors are each actuated by a control motor. Both temperature doors for the rear vents are connected to each other by a connector rod; they are actuated by another control motor. Refer to «A/C UNIT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) . On the "Basis" A/C system, one shaft connects the front temperature flaps and the temperature flap for the rear footwell vent to each other. The right and left temperature flap shafts are connected to each other by a connector rod; they are actuated by one motor. Refer to «A/C UNIT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) . Temperature doors in the left and right heater core housing. Refer to «HEATER CORE HOUSING TEMPERATURE DOORS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__heater-core-housing-temperature-doors) .
11. Right Rear Vent Temperature Door In this illustration, the temperature door is shown in the "cooling" position. Instructions for actuating the temperature doors, item 10 10 .
12. Heater Core For Heater Unit Heater core with the A/C installed, removing and installing, refer to «HEATER CORE/HOUSINGS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) . Covered with different foam seals, depending on the ("Comfort" and "Basis" A/C systems). Refer to «HEATER CORE/HOUSINGS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) .
13. Auxiliary Air Heater Heating Element -Z35- / Honey Comb The auxiliary heater heating element is installed on vehicles with certain gasoline engines. Refer to «AUXILIARY HEATER HEATING ELEMENT -Z35-, TESTING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__auxiliary-heater-heating-element-z35-testing) . Vehicles with gasoline engine, without auxiliary heater heating element have a honey comb installed in the as a place holder (this assures that current conditions in the A/C with and without auxiliary heater heating element are the same). Covered with different foam seals, depending on the ("Comfort" and "Basis" A/C systems). Refer to «AUXILIARY AIR HEATER HEATING ELEMENT -Z35- / HONEY COMB»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__auxiliary-air-heater-heating-element-z35) . NOTE: In MY 2009, as a running change, a new version of the auxiliary heater heating element is being installed (the heating element is a bit more narrow); be sure to use the correct version and note the allocation. As a running change from MY 10, gasoline engines that can run on bioethanol (Flex Fuel Vehicles) were introduced, which currently have an auxiliary heater heating element. Refer to «AUXILIARY HEATER HEATING ELEMENT -Z35-, TESTING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__auxiliary-heater-heating-element-z35-testing) . Currently an auxiliary heater heating element is installed for vehicles with a high voltage system (hybrid vehicles) and a gasoline engine «AUXILIARY HEATER HEATING ELEMENT -Z35-, TESTING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__auxiliary-heater-heating-element-z35-testing) .
14. Separator Wall Present only on vehicles equipped with the "Comfort" A/C system (not on the "Basis" A/C system; here only one temperature setting for all vents is possible). On the "Comfort" version, the air guide to the left and right vents separate and responsible for the differing air temperatures coming out of the vents. The temperature of the air coming out depends on the position of the respective temperature doors item 10 «AIR ROUTING IN AIR INTAKE HOUSING AND A/C UNIT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__air-routing-in-air-intake-housing) .
15. Separator Wall Present only on vehicles equipped with the "Comfort" A/C system (not on the "Basis" A/C system; here only one temperature setting for all vents is possible). On the "Comfort" A/C system, the air flow to the front and rear vents are separated from each other; the requirement for different front and rear air temperatures (depends on the setting of each temperature door, item 10 «AIR ROUTING IN AIR INTAKE HOUSING AND A/C UNIT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__air-routing-in-air-intake-housing) ).
16. Temperature Door For The Rear Left Vent In this illustration, the temperature door is shown in the "heat" position. Instructions for actuating the temperature doors item 10 10 .
17. Temperature Door For The Front Left Vent In this illustration, the temperature door is shown in the "cooling" position. Instructions for actuating the temperature doors item 10 10 .

AIR INTAKE AND OUTLET OPENINGS

Note. This illustration show the "Comfort" A/C system; some vent openings are not part of the "Basis" A/C system. The activation of the different doors in the vents and the temperature doors differs between the "Basis" and "Comfort" A/C systems From 01.2008, A/C units which have an additional connection for the glove compartment cooling are being installed. On vehicles without glove compartment cooling, this connection is sealed with a plug. Refer to GLOVE COMPARTMENT COOLING TO AIR INTAKE MANIFOLD CONNECTION .

Scheme 257

1. Air Conditioner Unit Different versions, depending on the ("Comfort" and "Basis" A/C systems). Refer to «A/C UNIT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) and the Parts Information. Heating and A/C unit, removing and installing, refer to «A/C UNIT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__ac-unit) .
2. Air Intake Housing Removing and installing, refer to «A/C UNIT AIR INTAKE HOUSING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__ac-unit-air-intake-housing) . Disassembling and assembling, refer to «A/C UNIT AIR INTAKE HOUSING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__ac-unit-air-intake-housing) .
3. Air Outlet To The Left Indirect Ventilation Vent Present only on vehicles equipped with the "Comfort" A/C system (not on the "Basis" A/C system). Depending on the setting, different temperatures for the left and right side are possible. Refer to «AIR DISTRIBUTOR HOUSING DOORS AND PARTITIONS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__air-distributor-housing-doors-and-partitions) .
4. Air Outlet To The Right Indirect Ventilation Vent Present only on vehicles equipped with the "Comfort" A/C system (not on the "Basis" A/C system). Depending on the setting, different temperatures for the left and right side are possible. Refer to «AIR DISTRIBUTOR HOUSING DOORS AND PARTITIONS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__air-distributor-housing-doors-and-partitions) .
5. Air Outlet To The Instrument Panel Defroster Vent Depending on the setting, different temperatures for the left and right side are possible. Refer to «AIR DISTRIBUTOR HOUSING DOORS AND PARTITIONS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__air-distributor-housing-doors-and-partitions) .
6. Fresh Air Intake The air is extracted out of the plenum chamber. Refer to «FRESH AIR INTAKE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__fresh-air-intake) .
7. Fresh Air Blower -V2
8. Removing Air From The Passenger Compartment (In Recirculating Air Mode) The air is taken from the passenger footwell under the glove compartment.
9. Air Outlet To The Right Instrument Panel Vent On the "Basis" A/C system, the doors in the vents to the left and right instrument panel vents are connected by a connector rod. Refer to «AIR DISTRIBUTOR HOUSING DOORS AND PARTITIONS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__air-distributor-housing-doors-and-partitions) .
10. Air Outlet To Right Front Footwell Vent On the "Basis" A/C system, the doors in the vents to the front left and right footwell are connected by a connector rod. Refer to «AIR DISTRIBUTOR HOUSING DOORS AND PARTITIONS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__air-distributor-housing-doors-and-partitions) .
11. Air Outlet To The Right Center Instrument Panel Vent Depending on the setting, on the "Comfort" A/C system, different air temperatures are possible on the left and right side. Refer to «AIR DISTRIBUTOR HOUSING DOORS AND PARTITIONS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__air-distributor-housing-doors-and-partitions) . On the "Basis" A/C system, the left and right side is included in one vent and only one door in installed. Refer to «AIR DISTRIBUTOR HOUSING DOORS AND PARTITIONS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__air-distributor-housing-doors-and-partitions) .
12. Air Outlet To The Left Center Instrument Panel Vent Depending on the setting, on the "Comfort" A/C system, different air temperatures are possible on the left and right side. Refer to «AIR DISTRIBUTOR HOUSING DOORS AND PARTITIONS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__air-distributor-housing-doors-and-partitions) . On the "Basis" A/C system, the left and right side is included in one vent and only one door in installed. Refer to «AIR DISTRIBUTOR HOUSING DOORS AND PARTITIONS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__air-distributor-housing-doors-and-partitions) .
13. Air Outlet To Right Rear Footwell Vent On the "Basis" A/C system, the doors in the left and right rear footwells are connected to each other by a shaft. Refer to «AIR DISTRIBUTOR HOUSING DOORS AND PARTITIONS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__air-distributor-housing-doors-and-partitions) . Depending on the setting, on the "Comfort" A/C system, different air temperatures are possible for the front and rear. Refer to «AIR DISTRIBUTOR HOUSING DOORS AND PARTITIONS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__air-distributor-housing-doors-and-partitions) .
14. Outlet To Vent In Rear Right Center Console Present only on vehicles equipped with the "Comfort" A/C system (not on the "Basis" A/C system). Depending on the setting, different air temperatures for the front and rear are possible. Refer to «AIR DISTRIBUTOR HOUSING DOORS AND PARTITIONS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__air-distributor-housing-doors-and-partitions) .
15. Outlet To Vent In Rear Left Center Console Present only on vehicles equipped with the "Comfort" A/C system (not on the "Basis" A/C system). Depending on the setting, different air temperatures for the front and rear are possible. Refer to «AIR DISTRIBUTOR HOUSING DOORS AND PARTITIONS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__air-distributor-housing-doors-and-partitions) .
16. Air Outlet To The Rear Left Footwell Vent On the "Basis" A/C system, the doors in the left and right rear footwells are connected to each other by a shaft. Refer to «AIR DISTRIBUTOR HOUSING DOORS AND PARTITIONS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__air-distributor-housing-doors-and-partitions) . Depending on the setting, on the "Comfort" A/C system, different air temperatures are possible for the front and rear. Refer to «AIR DISTRIBUTOR HOUSING DOORS AND PARTITIONS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__air-distributor-housing-doors-and-partitions) .
17. Air Outlet To The Front Left Footwell Vent On the "Basis" A/C system, the doors in the vents to the front left and right footwell are connected by a connector rod. Refer to «AIR DISTRIBUTOR HOUSING DOORS AND PARTITIONS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__air-distributor-housing-doors-and-partitions) .
18. Air Outlet To The Left Instrument Panel Vent On the "Basis" A/C system, the doors in the vents to the left and right instrument panel vents are connected by a connector rod. Refer to «AIR DISTRIBUTOR HOUSING DOORS AND PARTITIONS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__air-distributor-housing-doors-and-partitions) .

BACK PRESSURE DOOR MOTOR -V71-, FUNCTION

1. The position of the fresh air- and back pressure door is visible via the air intake opening in the plenum chamber when the air recirculation is closed (if necessary, remove the plenum chamber cover and cover over fresh air intake. Refer to «FRESH AIR INTAKE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__fresh-air-intake) ).
2. For air flow regulation, fresh air intake channel is closed partially via air flow door at high vehicle speed (from approximately 80 km/h (50 mph)) by A/C control head Climatronic Control Module -J255- (position of recirculating air door is specified by Climatronic control module).
3. To reduce the change in noise from the fresh air blower -V2- due to different air intake when switching from fresh air to recirculation or vice versa, the back pressure door motor and recirculation door motor -V113- are activated as follows

When switching from fresh air to recirculation mode, the recirculation door is first opened, then the fresh air intake channel is closed via the back pressure and fresh air door.

When switching from recirculation to fresh air mode, the fresh air intake channel is first closed by the back pressure/fresh air door, then the recirculation door is closed.

In partially recirculating air mode, recirculating air door -E- is opened and back pressure- / fresh air flow door is brought into an intermediate position by Climatronic control module (fresh air and recirculating air intake channel are slightly opened simultaneously). This achieves improved cool-off in certain temperature ranges and simultaneously draws in a certain portion of fresh air as well.

BATTERY COOLING MODULE OVERVIEW

With high voltage systems (hybrid vehicles)

Read and follow all of the supplemental warnings for all work performed on vehicles with the high voltage system. Refer to HIGH VOLTAGE SYSTEM (HYBRID VEHICLES) REPAIRS .

Note. The battery regulation control module -J840- activates the attachments. Refer to the Vehicle Diagnostsc Tester in "Guided Fault Finding" function.

If it is necessary for the following procedure to perform work in the vicinity of high voltage components, perform a visual inspection of the high voltage components and cables for damages. Refer to VISUAL INSPECTION OF HIGH-VOLTAGE COMPONENTS AND CABLES FOR DAMAGE and always follow the warnings when working on the high voltage system. .

Scheme 258

1. Condensation Drain Checking, removing and installing, refer to «BATTERY COOLING MODULE CONDENSATION WATER DRAIN»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__battery-cooling-module-condensation-water-drain) .
2. Bonded Rubber Bushing
3. Nut 9 Nm
4. Battery Cooling Module Bringing into service position, refer to «BATTERY COOLING MODULE, SERVICE POSITION»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__battery-cooling-module-service-position) . Removing and installing, refer to «BATTERY COOLING MODULE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__battery-cooling-module) .
5. Screw Tightening specification: 10 Nm, refer to «EXPANSION VALVE WITH HYBRID BATTERY REFRIGERANT SHUT-OFF VALVE 2 -N517»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__expansion-valve-with-hybrid-battery-refrigerant) .
6. Expansion Valve With Hybrid Battery Refrigerant Shut-Off Valve 2 -N517- Removing and installing, refer to «EXPANSION VALVE WITH HYBRID BATTERY REFRIGERANT SHUT-OFF VALVE 2 -N517»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__expansion-valve-with-hybrid-battery-refrigerant) .
7. O-ring Seals Replace
8. Retaining Clip
9. Screw 1.5 Nm
10. Hybrid Battery Recirculation Door Positioning Motor 1 -V479- Removing and installing, refer to «HYBRID BATTERY RECIRCULATION DOOR POSITIONING MOTORS 1 AND 2 -V479- / -V480»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__hybrid-battery-recirculation-door-positioning-motors) .
11. Screw 1.5 Nm
12. Hybrid Battery Recirculation Door Positioning Motor 2 -V480- Removing and installing, refer to «HYBRID BATTERY RECIRCULATION DOOR POSITIONING MOTORS 1 AND 2 -V479- / -V480»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__hybrid-battery-recirculation-door-positioning-motors) .
13. Temperature Sensor Before Hybrid Battery Evaporator -G756- Removing and installing, refer to «TEMPERATURE SENSOR BEFORE -G756- AND AFTER HYBRID BATTERY EVAPORATOR -G757»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__temperature-sensor-before-g756-and-after) .
14. Battery Fan 1 -V457- Removing and installing, refer to «BATTERY FAN 1 -V457»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__battery-fan-1-v457) .
15. Screw 1.5 Nm
16. Temperature Sensor After Hybrid Battery Evaporator -G757- Removing and installing, refer to «TEMPERATURE SENSOR BEFORE -G756- AND AFTER HYBRID BATTERY EVAPORATOR -G757»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__temperature-sensor-before-g756-and-after) .

Bonded Rubber Bushing - Installed Position

Scheme 259

1. The collar -arrow- on the bonded rubber bushing -1- faces upward.

BELT PULLEY WITH A/C CLUTCH -N25- OVERVIEW

Note. If overload protection of pulley triggers, check the A/C compressor for ease of motion before replacing the pulley. If the A/C compressor creates friction, replace it completely. Depending on the engine type, it may be necessary to loosen the lock carrier from the vehicle and to pull it slightly forward (to make space). Refer to Description and Operation . Different versions of the belt pulley (with different diameters) may be installed, depending on A/C compressor construction type and engine version. Refer to Electronic Parts Information (ETKA). The replacement belt pulley with A/C clutch has a single part number. The belt pulley and the drive plate are held together with one bolt (when the bolt is no longer needed, dispose of it). When the bolt was manufactured, a predetermined amount of a specific grease was applied to the threads in the drive plate; this amount is sufficient for bolting the drive plate to the compressor one time (a drive plate, which has been removed, cannot be reused). Refer to Electronic Parts Information (ETKA).

Scheme 260

1. Sealing Cap Not always present
2. Clutch Plate Tightening specification 30 Nm Replace Attached to the A/C compressor input shaft -- Clean the contact surfaces on the clutch plate and belt pulley before installing. -- Clean the thread on the A/C compressor shaft before installing the clutch plate. -- Check the gap dimension between the belt and clutch plates and correct it if necessary before tightening. Refer to «A/C COMPRESSOR CLUTCH PLATE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__ac-compressor-clutch-plate) . NOTE: The thread of the new clutch plate has already been greased with a specific amount of a grease by the manufacturer. Different versions. The overload protection takes over when the torque is excessive (for example, if the A/C compressor runs with resistance) and the belt pulley runs freely without driving the A/C compressor -N25-. Removing and installing -- Hold the compressor shaft -C- tight and turn the clutch plate counter-clockwise in direction of arrow with a suitable tool to remove as described for the drive plate on an A/C compressor without an A/C clutch. Refer to «A/C COMPRESSOR CLUTCH PLATE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__ac-compressor-clutch-plate) .
3. Washer
4. Spacer For adjusting the gap dimension between the clutch and belt pulley. Checking clearance, refer to «A/C COMPRESSOR BELT PULLEY AND CLUTCH PLATE GAP, CHECKING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__ac-compressor-belt-pulley-and-clutch) .
5. Circlip Replace Install on correct side (the flat side faces the A/C compressor) Be careful not to bend the locking ring more than necessary when installing it. -- Insert circlip on correct side, the side with beveled insertion edge -C- faces away from A/C compressor (install the flat side facing the A/C compressor).
6. Belt Pulley The belt pulley is sensitive to impact. Be very careful when handling it. Clean the flange on the A/C compressor flange before installing the belt pulley. There are different versions (depending, for example, on the type of engine). Refer to the Parts Information. If it is not possible to remove the belt pulley from the flange on the A/C compressor by hand, then refer to «BELT PULLEY WITH A/C CLUTCH»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__belt-pulley-with-ac-clutch) .
7. Circlip Replace Install on correct side (the flat side faces the A/C compressor) Be careful not to bend the locking ring more than necessary when installing it. -- Insert circlip on correct side, the side with beveled insertion edge -C- faces away from A/C compressor (install the flat side facing the A/C compressor).
8. Magnetic Coil Make sure the bracket for the cable -B- is installed correctly. The connector -D- may be attached to the A/C compressor with a bracket, depending on the version.
9. A/C Compressor There are different versions depending on engine installed and the market. Refer to the Parts Information. Clean the A/C compressor flange before installing the pulley. Clean the compressor shaft thread and then coat the thread lightly with grease.

BELT PULLEY WITHOUT A/C CLUTCH OVERVIEW

Note. If overload protection of pulley triggers, check the A/C compressor for ease of motion before replacing the pulley. If the A/C compressor creates friction, replace it completely. Depending on the engine type, it may be necessary to loosen the lock carrier from the vehicle and to pull it slightly forward (to make space). Refer to Description and Operation . Different versions of the belt pulley (with different diameters) may be installed, depending on A/C compressor construction type and engine version. Refer to Electronic Parts Information (ETKA). As a replacement part, the belt pulley with the drive plate and the cap is available under one part number. The belt pulley and the drive plate are held together with one bolt (when the bolt is no longer needed, dispose of it). When the bolt was manufactured, a predetermined amount of a specific grease was applied to the threads in the drive plate; this amount is sufficient for bolting the drive plate to the compressor one time (a drive plate, which has been removed, cannot be reused). Belt pulley, removing and installing, refer to A/C COMPRESSOR BELT PULLEY .

Scheme 261

1. Sealing Cap
2. Drive Plate Tightening specification 30 Nm Replace Bolted with the A/C compressor driveshaft, clean the compressor shaft thread before mounting the drive plate. NOTE: The thread of the new drive plate has already been greased with a specific amount of a grease by the manufacturer. Different versions. The overload protection takes over when the torque is excessive (for example, if the A/C compressor runs with resistance) and the belt pulley runs freely without driving the A/C compressor. With rubber elements for decoupling belt pulley from A/C compressor input, dampens rations and noise. For installation, lightly coat rubber elements, for example with tire mounting paste or a soap solution (as a lubricant) Removing and installing, refer to «A/C COMPRESSOR BELT PULLEY»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__ac-compressor-belt-pulley) .
3. Circlip Replace Install on correct side (the flat side faces the A/C compressor). Removing and installing, refer to «A/C COMPRESSOR BELT PULLEY»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__ac-compressor-belt-pulley) .
4. Belt Pulley Belt pulley is made of plastic and is sensitive to impact, therefore handle it with especial care. There are different versions (depending, for example, on the type of engine). Removing and installing, refer to «A/C COMPRESSOR BELT PULLEY»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__ac-compressor-belt-pulley) .
5. A/C Compressor There are different versions depending on engine installed and the market. Clean the A/C compressor flange before installing the pulley. Clean the compressor shaft thread and then coat the thread lightly with grease.

COMPONENTS ON LEFT SIDE OVERVIEW

Note. The following illustrations show the location of the components on an Audi A5 Coupe; an Audi A5 Sportback, Audi A4, Audi Q5 etc., the location of the components varies slightly. The description of the components is not different; removing, installing and checking is performed in the same way as on the Audi A5 Coupe.

Scheme 262

1. Left Seat (Driver's Seat) With Seat Heating and Seat Ventilation Components Seat heating components (Left Front Seat Temperature Sensor -G344-, Left Front Heated Seat -Z45-) and seat ventilation (control unit and blowers), refer to «Seat Frames»(/audi/a5/i-2007-2011/remont/seats/#seat-frames-coupe) and «Seat Upholstery, Covers»(/audi/a5/i-2007-2011/remont/seats/#seat-upholstery-covers-coupe) . The seat heating and seat ventilation are not installed in all vehicles (optional equipment). The A/C Control Head Climatronic control module -J255- adjusts the seat heating and seat ventilation. Activation of seat heater and seat ventilation are displayed in measured value block of Climatronic Control Module, check using the Vehicle Diagnostic Tester in "Guided Fault Finding" function. Different control units, refer to «FRONT SEAT HEATING AND VENTILATION, CHECKING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__front-seat-heating-and-ventilation-checking) , appropriate SYSTEM WIRING DIAGRAM and the Vehicle Diagnostic Tester in "Guided Fault Finding" function, activate the seat heating the seat ventilation, depending on the vehicle equipment and version. (for the Vehicle Electrical System Control Module -J519-, the Memory Seat/Steering Column Adjustment Control Module -J136- and the Passenger Memory Seat Control Module -J521-, depending on the vehicle). Repair the seat heating and the seat ventilation. Refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/seats/#seat-frames-coupe) and «Removal and Installation»(/audi/a5/i-2007-2011/remont/seats/#seat-upholstery-covers-coupe) . For information about seat heating and seat ventilation, refer to «FRONT SEAT HEATING AND VENTILATION, CHECKING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__front-seat-heating-and-ventilation-checking) . NOTE: If there is a condition, where the heating or ventilation of the driver of passenger seat cannot be switched on, this will be stored as a malfunction in the Vehicle Electrical System Control Module -J519-, in the Memory Seat/Steering Column Adjustment Control Module -J136- or in Passenger Memory Seat Control Module -J521- (depending on the vehicle type and the vehicle equipment level). Currently no information is sent to the Climatronic control module -J255- display and control head via the data bus system; the DTC memory must be read out in each control unit or in the Comfort System Central Control Module -J393- using the Vehicle Diagnostic Tester in "Guided Fault Finding" function. In the event of a complaint regarding seat heating or seat ventilation, first check the event memory of the control modules activating the seat heating and seat ventilation. The seat heating and ventilation is adjusted by the Climatronic control module display and control head; the adjustment is transmitted to the vehicle electrical system control module via the Data bus. The specified temperatures for the different seat heating and seat ventilation settings are stored in the vehicle electrical system control module. Depending on the version of the vehicle electrical system control module and on the vehicle build date, the specified temperature for the seat heating and ventilation can be different with the same setting on the Climatronic control module display and control head. Check using the Vehicle Diagnostic Tester in "Guided Fault Finding" function (for the vehicle electrical system control module).
2. Left Condensation Water Drain (Driver Side) Checking, removing and installing, refer to «CONDENSATION WATER DRAIN HOSE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__condensation-water-drain-hose) .
3. Accelerator Pedal The request to switch off the A/C compressor kick-down (via the A/C compressor regulator valve -N280-) comes from the engine control module (the data is exchanged through the Data bus). Read the actual activation of the A/C compressor regulator valve in the Climatronic control module -J255- using the Vehicle Diagnostic Tester under "Guided Fault Finding" (the A/C system and the fuel injection and ignition system).
4. Diagnostic Connection Perform Guided Fault Finding for the A/C system using the Vehicle Diagnostic Tester under "Guided Fault Finding".
5. Vehicle Electrical System Control Module -J519- The A/C system controls different components, for example, the heated rear window -Z1- via the comfort system central control module -J393-. Refer to the Vehicle Diagnostic Tester in "Guided Fault Finding" function. Removing and installing, checking, refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/wiring-system-data-link-connectors-pwr-dist-grnd-dist/#wiring-coupe) .
6. Left Front Upper Body Outlet Temperature Sensor -G385- -- Installed only in the "Comfort" A/C system. Removing and installing, refer to «LEFT FRONT UPPER BODY VENT TEMPERATURE SENSOR -G385»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__left-front-upper-body-vent-temperature) .
7. Defroster Vent/Left Side Window Removing and installing, refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/exteriorinterior-trim/#interior-trim-coupe) .
8. Instrument Panel Vent, Left Removing and installing instrument panel vents, refer to «INSTRUMENT PANEL VENTS AND REAR VENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__instrument-panel-vents-and-rear-vents) and «Removal and Installation»(/audi/a5/i-2007-2011/remont/exteriorinterior-trim/#interior-trim-coupe) .
9. Instrument Cluster Control Module -J285- With outside air temperature -G106- in the Driver Information System. If there is a complaint due to an excessive display value of outside air temperature (due to an excessive measured value of the Outside Air Temperature Sensor -G17-), refer to «OUTSIDE AIR TEMPERATURE SENSOR -G17»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__outside-air-temperature-sensor-g17) . Check using the Vehicle Diagnostic Tester in "Guided Fault Finding" function.
10. Front Information Display Control Head -J685- Multi Media Interface (MMI) Display Different versions and operation; depends on the version of the MMI ("Infotainment" or "Basis") and vehicle equipment. Refer to the Owner's Information Infottainment / MMI. Functions selected (and various additional A/C system functions) on Climatronic Control Module -J255- are indicated via MMI display. Refer to the Owner's Information / MMI. Using the "Car" button on the Radio or the Multimedia Control Head -E380- (depending on the vehicle equipment level) additional functions of the A/C system can be called up and their settings can be changed. Refer to the Owner's Manual Infottainment / MMI. From MY 2009, on the Audi A5 Coupe and on the Audi A4, a revised Climatronic control module, A/C control head, is being installed (this has been already done on the Audi Q5 since the start of production). Refer to item 14 «COMPONENTS ON LEFT SIDE OVERVIEW»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__components-on-left-side-overview) On vehicles with these A/C control heads, and depending on the coding and adaptation, for example the display on the screen for the "MMI" (Multi Media Interface), when using the buttons and knobs, the A/C control head no longer switches to "A/C system". The selected functions for the A/C system appear in the display sequentially (different versions). Check using the Vehicle Diagnostic Tester in "Guided Fault Finding" function, Owner's Manual and Owner's Manual Infotainment / MMI. NOTE: Pay attention to the correct allocation, coding and adaptation for the Climatronic control module, for the Front Information Display Control Head Control Module -J523- / Information Electronics Control Module 1 -J794- (different version depending on the time production and vehicle equipment level), If the allocation, coding and adaptation are incorrect, the A/C function cannot be displayed or selected in the MMI. From MY 2012, this vehicle has a Start/Stop System for specific engines as optional equipment. On vehicles with Start/Stop system, the Climatronic control module display and control head prevents the Stop function. If, for example, "defrost" is selected, the stop function is not possible or will be interrupted and the engine will start. The same applies in the case of heating and cooling. The difference between the selected and actual temperature is greater than a specified value. Check using the Vehicle Diagnostic Tester in "Guided Fault Finding" function. Vehicles with the Start/Stop System have an additional coolant pump for the Stop function depending on the vehicle equipment level and on the version of the vehicle. Refer to «COOLANT PUMP»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2) , «[For engine(s) CAUA] Description and Operation»(ref-520122-S38578899852012123100000) or to «[For engine(s) CAEB] Description and Operation»(ref-520126-S15924086162012123100000) or to «[For engine(s) CALA] Description and Operation»(/audi/a5/i-2007-2011/remont/cooling-fan/#32l-cooling-system-engine-codes-cala-coupe-as-of-122008) and the Vehicle Diagnostic Tester in "Guided Fault Finding" function. If the vehicle has a Start/Stop System, then only the following Climatronic control module may be installed: part number 8T1 820 043 starting with index "AG".
11. Air Humidity Sensor -G355- Removing and installing, refer to Interior Rearview Mirror in «Removal and Installation»(/audi/a5/i-2007-2011/remont/seats/#interior-equipment-coupe) . -- Not installed on all vehicles (depends on when the vehicle was manufactured and on the vehicle equipment). Checking using the Vehicle Diagnostic Tester in "Guided Fault Finding" function. NOTE: At the start of production, the humidity sensor was installed only on the "Comfort" A/C system. Beginning with the MY 12 Audi A4 and Audi 5, the vehicle version was changed-over as a running change. Refer to «CLIMATRONIC CONTROL MODULE -J255- A/C CONTROL HEAD ALLOCATION»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__climatronic-control-module-j255-ac-control) . Vehicles with the "Basis" A/C system built after the change-over have a humidity sensor. The comfort system central control module -J393- or the data bus on board diagnostic interface -J533- evaluates the measured value from the humidity sensor on vehicles manufactured before the change-over. The vehicle electrical system control module -J519- evaluates the measured value from the humidity sensor on vehicles manufactured from the product change-over. Refer to appropriate SYSTEM WIRING DIAGRAM and the Vehicle Diagnostic Tester in "Guided Fault Finding" function.
12. Radio -R- Depending on the vehicle equipment level, instead of a radio, a Multimedia Control Head -E380- may be installed. Using the "Car" button, additional A/C system functions can be called up and their settings changed. Refer to the Owner's Information / MMI. Check using the Vehicle Diagnostic Tester in "Guided Fault Finding" function.
13. Interior Temperature Sensor Fan -V42- and Instrument Panel Interior Temperature Sensor -G56- Installed in the A/C Control Head Climatronic Control Module -J255-. Interior Temperature Sensor Fan -V42-, removing and installing, refer to «INTERIOR TEMPERATURE SENSOR FAN -V42»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__interior-temperature-sensor-fan-v42) . The Instrument Panel Interior Temperature Sensor -G56- is integrated in the Climatronic control module (cannot be replaced separately). NOTE: On the "Comfort" A/C system, if the intermediate piece on the air guides to the rear footwell vents and on the air guide to the rear center console vents is installed incorrectly, warm or cold air can escape and influence the A/C system. This air is then taken in by the interior temperature sensor fan and the measured value from the instrument panel interior temperature sensor -G56- will differ from the actual temperature inside the passenger compartment.
14. A/C Control Head Climatronic Control Module -J255- of "Basic" version Different versions (for vehicles without or with heated seats, left- or right side steering, depending on the time of manufacturer and equipment level), allocation item 15 15 Removing and installing, refer to «CLIMATRONIC CONTROL MODULE -J255- A/C CONTROL HEAD»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__climatronic-control-module-j255-ac-control) . The Instrument Panel Interior Temperature Sensor -G56- is integrated in the Climatronic Control Module (cannot be replaced separately). Interior Temperature Sensor Fan -V42- is installed in Climatronic Control Module, however it cannot be replaced individually. Refer to «INTERIOR TEMPERATURE SENSOR FAN -V42»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__interior-temperature-sensor-fan-v42) . Perform Guided Fault Finding on the Climatronic control module using the Vehicle Diagnostic Tester under "Guided Fault Finding". Also pay attention to the information regarding the Climatronic control module. Refer to «CLIMATRONIC CONTROL MODULE -J255- A/C CONTROL HEAD»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__climatronic-control-module-j255-ac-control) . NOTE: On the Audi A5 Coupe and Audi A4 from MY 2009, the Climatronic control module, part number 8T1 820 043 starting with the index letter "T" is installed (on the Audi Q5 this was already installed since the start of production). Refer to item 15 «COMPONENTS ON LEFT SIDE OVERVIEW»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__components-on-left-side-overview) . Beginning with MY 2010, the Start/Stop System will be offered as an option for this vehicle with certain engines. Refer to item 15 «COMPONENTS ON LEFT SIDE OVERVIEW»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__components-on-left-side-overview) and the Vehicle Diagnostic Tester under "Guided Fault Finding". If the vehicle has a Start/Stop System, then only the following Climatronic control module display and control heads may be installed: part number 8T1 820 043 starting with index "AG". NOTE: An updated fresh air blower control module -J126-, fresh air blower -V2-, Climatronic control module, vehicle electrical system control module -J519-, comfort system central control module -J393-, air quality sensor -G238- and air conditioner are being installed as a running change from MY 12 (depending on the vehicle version). Pay attention to the version and allocation of these components. Refer to the Vehicle Diagnostic Tester in "Guided Fault Finding" function. The fresh air blower control module does not control the fresh air blower if the Climatronic control module allocation or adaptation to fresh air blower module (part number 8K0 820 521 or 8T0 820 521) is not according to the specification. There may not always be an entry in the DTC memory even though the activation of the fresh air blower is not OK. Make sure the Climatronic control module adaptation is correct. Refer to the Vehicle Diagnostic Tester in "Guided Fault Finding" function. At the start of production, the humidity sensor -G355- was installed only on the "Comfort" A/C system. The humidity sensor is being installed in vehicles equipped wit the "Basis" A/C system and since the introduction of the Stop/Stop System from MY 10. The comfort system central control module -J393- or the data bus on board diagnostic interface -J533- evaluates the measured value from the humidity sensor on vehicles manufactured prior to the version change-over (except Audi Q5 Hybrid). The vehicle electrical system control module evaluates the measured value from the humidity sensor on vehicles manufactured from the product change-over (on all Audi Q5 Hybrid). Refer to appropriate SYSTEM WIRING DIAGRAM and the Vehicle Diagnostic Tester in "Guided Fault Finding" function. Different versions of the humidity sensor in fresh air intake duct / air quality sensor are being installed depending on when the vehicle was manufactured and which A/C system the vehicle has ("Basis" or "Comfort"). The "Basis" A/C system does not have a humidity sensor in fresh air intake duct / air quality sensor until the MY 12 change-over. From MY 12 it has a humidity sensor in fresh air intake duct without an air quality sensor (black housing). Through MY 12, the "Comfort" A/C system has an air quality sensor without a humidity sensor in fresh air intake duct. From MY 12, it has a humidity sensor in fresh air intake duct with an air quality sensor, (brown housing). Vehicles with the "Comfort" A/C system have an air quality sensor -G238- without a humidity sensor in fresh air intake duct -G657- (from start of production up the change-over) Beginning with the MY 12 Audi A4 and Audi 5, the vehicle version was changed-over as a running change. Refer to «CLIMATRONIC CONTROL MODULE -J255- A/C CONTROL HEAD ALLOCATION»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__climatronic-control-module-j255-ac-control) . Vehicles, built before the change-over and with the "Comfort" A/C system, have an air quality sensor -G238- (not on the "Basis"). Vehicles built since this change-over (and on the Audi Q5 Hybrid): if the vehicle has the "Basis" A/C system, then it has a humidity sensor in fresh air intake duct -G657- ; if the vehicle has the "Comfort" A/C system, then it has a humidity sensor in fresh air intake duct and an air quality sensor. The buttons and rotary switches have LEDs, they cannot be replaced individually. The function and indicator lights in the buttons and in the rotary switches cannot be replaced separately.
15. A/C Control Head Climatronic Control Module -J255- of "Comfort" A/C system Different versions (for vehicles without or with heated seats / seat ventilation, left- or right side steering, depending on the time of manufacturer and equipment level), Removing and installing, refer to «CLIMATRONIC CONTROL MODULE -J255- A/C CONTROL HEAD»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__climatronic-control-module-j255-ac-control) . Instrument Panel Temperature Sensor -G56- is integrated in Climatronic Control Module (cannot be replaced individually). Interior Temperature Sensor Fan -V42- is installed in Climatronic Control Module, however it cannot be replaced individually. Refer to «INTERIOR TEMPERATURE SENSOR FAN -V42»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__interior-temperature-sensor-fan-v42) . Perform Guided Fault Finding on the Climatronic control module using the Vehicle Diagnostic Tester in "Guided Fault Finding" function. Also pay attention to the information regarding the Climatronic control module. Refer to «CLIMATRONIC CONTROL MODULE -J255- A/C CONTROL HEAD»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__climatronic-control-module-j255-ac-control) . The buttons, displays and rotatory switches are lit with LEDs; they cannot be replaced individually. The function and indicator lights in the buttons and in the rotary switches cannot be replaced separately. On the Audi A5 Coupe and Audi A4 from MY 2009, the Climatronic control module, part number 8T1 820 043 starting with the index letter "T" is installed (on the Audi Q5 this was already installed since the start of production). On vehicles with these A/C control heads, and depending on the coding and adaptation, for example the display on the screen for the "MMI" (Multi Media Interface), when using the buttons and knobs, the A/C control head no longer switches to "A/C system". The selected functions for the A/C system appear in the display sequentially. Refer to the Vehicle Diagnostic Tester in "Guided Fault Finding" function, Owner's Information and Owner's Information / MMI. NOTE: Pay attention to the correct allocation, coding and adaptation of the Climatronic control module, for the Front Information Display Control Head Control Module -J523- / Information Electronics Control Module 1 -J794-. Refer to Electronic Vehicle Diagnostic Tester in "Guided Fault Finding" function. If the allocation, coding or adaptation are incorrect, the A/C function cannot be displayed or selected in the MMI. The Climatronic control module, part number 8T1 820 043 up to index letter "S" are installed on vehicles with a Front Information Display Control Head Control Module -J523-. The Climatronic control module, part number 8T1 820 043 beginning with index "T" may be installed on vehicles with an Information Electronics Control Module 1 -J794-. In order to be able to select and display the different functions, the coding and adaptation must be correct for the vehicle equipment level. Read the information regarding the vehicle updates from MY 12, refer to item 14 14 .
16. Multimedia Control Head -E380- Depending on the vehicle equipment level, instead of a Multimedia Control Head -E380- a Radio -R- may be installed. Using the "Car" button, additional A/C system functions can be called up and their settings changed. Refer to the Owner's Information / MMI. Check using the Vehicle Diagnostic Tester in "Guided Fault Finding" function. In order to be able to select and display the different A/C system functions on the Multimedia Control Head and on the Front Information Display Control Head -J685- the correct version of the Climatronic control module -J255-, A/C control head, must be installed and coded correctly and adapted. Refer to item 15 15 .

COMPONENTS ON RIGHT SIDE OVERVIEW

Note. The following illustrations show the location of the components on an Audi A5 Coupe; an Audi A5 Sportback, Audi A4, Audi Q5 etc., the location of the components varies slightly. The description of the components is not different; removing, installing and checking is performed in the same way as on the Audi A5 Coupe.

Scheme 263

1. Defroster Vent/Front Window Removing and installing, refer to «Interior Trim»(/audi/a5/i-2007-2011/remont/exteriorinterior-trim/#interior-trim-coupe)
2. Sunlight Photo Sensor -G107- Removing and installing, refer to «SUNLIGHT PHOTO SENSOR -G107»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__sunlight-photo-sensor-g107) and «Removal and Installation»(/audi/a5/i-2007-2011/remont/exteriorinterior-trim/#interior-trim-coupe) .
3. Vents For Indirect Ventilation / Loud Speaker Cover, Instrument Panel, Center Removing and installing vent, refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/exteriorinterior-trim/#interior-trim-coupe) . The vent for indirect ventilation is only installed on vehicles equipped with the "Comfort" A/C system. On vehicles equipped with the "Basis" A/C system, the cover is installed and the opening for the A/C is sealed (different version of the A/C system and the air guide under the dash panel).
4. A/C Unit With Evaporator And Add-On Components Different versions depending on the vehicle version and equipment level. Refer to «A/C UNIT AND AIR INTAKE HOUSING COMPONENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__ac-unit-and-air-intake-housing) Air Intake and Outlet Openings «AIR INTAKE AND OUTLET OPENINGS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__air-intake-and-outlet-openings) . Air Routing in Air Intake Housing and A/C Unit «AIR ROUTING IN AIR INTAKE HOUSING AND A/C UNIT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__air-routing-in-air-intake-housing) . Temperature doors in the left and right heater core housing «HEATER CORE HOUSING TEMPERATURE DOORS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__heater-core-housing-temperature-doors) . Heating & A/C unit components, refer to «A/C UNIT AND AIR INTAKE HOUSING COMPONENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__ac-unit-and-air-intake-housing) . Clean air conditioning system evaporator with Ultrasound A/C Cleaner VAS 6189A, refer to «EVAPORATOR CLEANING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2) . Heating and A/C unit, removing and installing, refer to «A/C UNIT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__ac-unit) . NOTE: From 01.2008, A/C units which have an additional connection for the glove compartment cooling are being installed. On vehicles without glove compartment cooling, this connection is sealed with a plug. Refer to «GLOVE COMPARTMENT COOLING TO AIR INTAKE MANIFOLD CONNECTION»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__glove-compartment-cooling-to-air-intake) .
5. Left Center Instrument Panel Vent Removing and installing instrument panel vents, refer to «INSTRUMENT PANEL VENTS AND REAR VENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__instrument-panel-vents-and-rear-vents) and «Removal and Installation»(/audi/a5/i-2007-2011/remont/exteriorinterior-trim/#interior-trim-coupe) .
6. Right Center Instrument Panel Vent Removing and installing instrument panel vents, refer to «INSTRUMENT PANEL VENTS AND REAR VENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__instrument-panel-vents-and-rear-vents) and «Removal and Installation»(/audi/a5/i-2007-2011/remont/exteriorinterior-trim/#interior-trim-coupe) .
7. Defroster Vent/Right Side Window Removing and installing, refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/exteriorinterior-trim/#interior-trim-coupe) .
8. Instrument Panel Vent, Right Removing and installing instrument panel vents, refer to «INSTRUMENT PANEL VENTS AND REAR VENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__instrument-panel-vents-and-rear-vents) and «Removal and Installation»(/audi/a5/i-2007-2011/remont/exteriorinterior-trim/#interior-trim-coupe) .
9. Dust and Pollen Filter (With Or Without Activated Charcoal Filter Element) Follow the replacement intervals. Refer to «Maintenance, Diagnosis»(/audi/a5/i-2007-2011/remont/procedures/#how-to-diagnosis-the-maintenance-maintenance-intervals-coupe) . Different versions depending on the vehicle version and equipment level. -- Oh vehicles with the "Basis" A/C system without activated charcoal filter element -- Oh vehicles with the "Comfort" A/C system with an activated charcoal filter element There is an air quality sensor -G238- installed on these vehicles. Refer to «DUST AND POLLEN FILTER WITH ACTIVATED CHARCOAL INSERT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__dust-and-pollen-filter-with-activated) . Removing and installing, refer to «DUST AND POLLEN FILTER»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__dust-and-pollen-filter) . NOTE: In model year 2012, vehicles with a "Comfort" A/C system will have a modified dust and pollen filter with an activated charcoal filter element installed as a running change. This filter with an improved interception rate for fine particulates has approximately the same air resistance values as the filter installed prior to the change, and for this reason will be in installed in vehicles built up to the change. If the customer requests it, it is permitted the exchange a dust and pollen filter without an activated charcoal filter element that came with the vehicle from the manufacturer for a dust and pollen filter with an activated charcoal filter element so long as the vehicle has the "Basis" A/C system.
10. Right Front Upper Body Outlet Temperature Sensor -G386- Removing and installing, refer to «RIGHT FRONT UPPER BODY VENT TEMPERATURE SENSOR -G386»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__right-front-upper-body-vent-temperature) . Installed only in the "Comfort" A/C system.
11. Right Condensation Water Drain (Front Passenger Side) Checking, removing and installing, refer to «CONDENSATION WATER DRAIN HOSE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__condensation-water-drain-hose) .
12. Right Seat (Passenger Seat) With Seat Heating and Seat Ventilation Components Seat heating components (Right Front Seat Temperature Sensor -G345-, Right Front Heated Seat -Z46-) and seat ventilation (control unit and blowers). Refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/seats/#seat-frames-coupe) and «Removal and Installation»(/audi/a5/i-2007-2011/remont/seats/#seat-upholstery-covers-coupe) . The seat heating and seat ventilation are not installed in all vehicles (optional equipment). The A/C Control Head Climatronic Control Unit -J255- adjusts the seat heating and seat ventilation. Activation of seat heater and seat ventilation are displayed in measured value block of front Climatronic Control Module, check using the Vehicle Diagnostic Tester in "Guided Fault Finding" function. Different control units, refer to «FRONT SEAT HEATING AND VENTILATION, CHECKING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__front-seat-heating-and-ventilation-checking) , appropriate SYSTEM WIRING DIAGRAM and the Vehicle Diagnostic Tester in "Guided Fault Finding" function, activate the seat heating the seat ventilation, depending on the vehicle equipment and version. (for the Vehicle Electrical System Control Module -J519-, the Memory Seat/Steering Column Adjustment Control Module -J136- and the Passenger Memory Seat Control Module -J521-, depending on the vehicle). Repair the seat heating and the seat ventilation. Refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/seats/#seat-frames-coupe) and «Removal and Installation»(/audi/a5/i-2007-2011/remont/seats/#seat-upholstery-covers-coupe) . For information about seat heating and seat ventilation, refer to «FRONT SEAT HEATING AND VENTILATION, CHECKING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__front-seat-heating-and-ventilation-checking) . NOTE: If there is a condition, where the heating or ventilation of the driver of passenger seat cannot be switched on, this will be stored as a malfunction in the Vehicle Electrical System Control Module, in the Memory Seat/Steering Column Adjustment Control Module or in the Passenger Memory Seat Control Module (depending on the vehicle type and the vehicle equipment level). Currently no information is sent to the Climatronic control module via the data bus system; the DTC memory must be read out in each control unit or in the Comfort System Central Control Module -J393- using the Vehicle Diagnostic Tester under "Guided Fault Finding" function. In the event of a complaint regarding seat heating or seat ventilation, first check the event memory of the control modules activating the seat heating and seat ventilation. The seat heating and ventilation is adjusted by the Climatronic control module; the adjustment is transmitted to the vehicle electrical system control module -J519- via the Data bus. The target temperatures for the different seat heating and seat ventilation settings are stored in the vehicle electrical system control module. Depending on the version of the vehicle electrical system control module and on the vehicle build date, the specified temperature for the seat heating and ventilation can be different with the same setting on the Climatronic control module. Check using the Vehicle Diagnostic Tester in "Guided Fault Finding" function (for the vehicle electrical system control module).
13. Vent In Center Console, Rear Removing and installing, refer to «INSTRUMENT PANEL VENTS AND REAR VENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__instrument-panel-vents-and-rear-vents) and «Removal and Installation»(/audi/a5/i-2007-2011/remont/exteriorinterior-trim/#interior-trim-coupe) . -- Installed only on the "Comfort" A/C system (on the "Basis" A/C system, the opening in the center console is sealed).
14. Rear Temperature Selection Potentiometer -G538- -- Installed only on the "Comfort" A/C system (on the "Basis" A/C system, the opening in the center console is sealed). The Rear Temperature Selection Potentiometer is part of the vent; cannot be replaced separately. Removing and installing, refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/exteriorinterior-trim/#interior-trim-coupe) . Check using the Vehicle Diagnostic Tester in "Guided Fault Finding" function.

EXTERIOR COMPONENTS

Note. The following illustrations show the location of the components on an Audi A5 Coupe; an Audi A5 Sportback, Audi A4, Audi Q5 etc., the location of the components varies slightly. The description of the components is not different; removing and installing is performed in the same way as on the Audi A5 Coupe.

Scheme 264

1. Rear Window Defogger -Z1- The instruction to activate the rear window heating is sent from the Climatronic control module -J255- display and control head via the Data bus to the comfort system central control module -J393-. The rear window defogger is controlled by the Comfort System Central Control Module -J393-. Refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/wiring-system-data-link-connectors-pwr-dist-grnd-dist/#wiring-coupe) and the Vehicle Diagnostic Tester in "Guided Fault Finding" function. Notes on function of heated rear window. Refer to «REAR WINDOW DEFOGGER -Z1-, CHECKING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__rear-window-defogger-z1-checking) . Rear window, removing and installing, refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/windows/#glass-window-regulators-coupe) .
2. Comfort System Central Control Module -J393- The Heated Rear Window -Z1- is controlled by the Comfort System Central Control Module. Refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/wiring-system-data-link-connectors-pwr-dist-grnd-dist/#wiring-coupe) and the Vehicle Diagnostic Tester in "Guided Fault Finding" function.
3. Label With specifications for type of refrigerant and designated fill capacity, refer to «Specifications»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#general-technical-data-refrigerant-r134a-servicing-coupe-2-of-2) .
4. Plenum Chamber Water Drains A water drain is installed at left and right in plenum chamber. Removing and installing, checking and cleaning, refer to «PLENUM CHAMBER WATER DRAIN»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__plenum-chamber-water-drain) .
5. Coolant Shut-Off Valve Depending on the engine, the shut-off valve is installed in the coolant feed and return line from the engine to the A/C heater core. -- The shut-off valve is currently installed only in vehicles having a 4- or 6-cylinder gasoline engine. NOTE: The vacuum from the Climatronic refrigerant shut-off valve -N422- activates the shut-off valve on start-of-production vehicles. On certain vehicles (depending on the engine), vacuum-controlled coolant shut-off valves were installed on vehicles without an "auxiliary heater" from start of production. Shut-off valves that are controlled directly were installed later as a running change. Refer to the appropriate SYSTEM WIRING DIAGRAM and the Vehicle Diagnostic Tester in "Guided Fault Finding". This valve is referred to as a climatronic refrigerant shut-off valve -N422- or a coolant shut-off valve -N82- depending on the engine version and on the time of production. Refer to appropriate SYSTEM WIRING DIAGRAM and the Vehicle Diagnostic Tester in "Guided Fault Finding". Allocation of the coolant shut-off valve and of the Climatronic refrigerant shut-off valve -N422- on the engine or inside the plenum chamber, refer to «CLIMATRONIC REFRIGERANT SHUT-OFF VALVE -N422- / COOLANT SHUT-OFF VALVE -N82- LOCATION, CONTROL AND FUNCTION»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__climatronic-refrigerant-shut-off-valve-n422) .
6. Climatronic Refrigerant Shut-Off Valve -N422- / Coolant Shut-Off Valve -N82- The installed location and the version of the Climatronic refrigerant shut-off valve may differ. It could be installed in the engine compartment or in the plenum chamber depending on the engine and the version of the vehicle. Refer to «CLIMATRONIC REFRIGERANT SHUT-OFF VALVE -N422- / COOLANT SHUT-OFF VALVE -N82- LOCATION, CONTROL AND FUNCTION»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__climatronic-refrigerant-shut-off-valve-n422) . -- The Climatronic refrigerant shut-off valve is currently only installed on certain vehicles with a 4- or 6-cylinder engine. Activation and function, refer to «CLIMATRONIC REFRIGERANT SHUT-OFF VALVE -N422- / COOLANT SHUT-OFF VALVE -N82- LOCATION, CONTROL AND FUNCTION»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__climatronic-refrigerant-shut-off-valve-n422) . Coolant shut-off valve and Climatronic refrigerant shut-off valve -N422- inside the vehicle allocation, refer to «CLIMATRONIC REFRIGERANT SHUT-OFF VALVE -N422- / COOLANT SHUT-OFF VALVE -N82- LOCATION, CONTROL AND FUNCTION»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__climatronic-refrigerant-shut-off-valve-n422) . NOTE: On certain vehicles (depending on the engine), vacuum-controlled coolant shut-off valves were installed on vehicles without an "auxiliary heater" from start of production. Shut-off valves that are controlled directly were installed later as a running change. Refer to appropriate SYSTEM WIRING DIAGRAM and the Vehicle Diagnostic Tester in "Guided Fault Finding". This valve is referred to as a climatronic refrigerant shut-off valve -N422- or a coolant shut-off valve -N82- depending on the engine version and on the time of production. Refer to appropriate SYSTEM WIRING DIAGRAM and the Vehicle Diagnostic Tester in "Guided Fault Finding". The Climatronic refrigerant shut-off valve -N422- / coolant shut-off valve -N82- is not installed in all versions with a 4-cylinder or 6-cylinder engine. Installation on vehicles without an "auxiliary heater" depends also on the market.
7. Outside Air Temperature Sensor -G17- The measured value of the outside air temperature sensor is evaluated by the vehicle electrical system control module -J519- and is transmitted via the Data bus to the Climatronic control module -J255- display and control head. Check using the Vehicle Diagnostic Tester in "Guided Fault Finding". If there is a complaint due to an excessive measured value on the outside air temperature sensor refer to «OUTSIDE AIR TEMPERATURE SENSOR -G17»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__outside-air-temperature-sensor-g17) . Removing and installing, refer to «OUTSIDE AIR TEMPERATURE SENSOR -G17»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__outside-air-temperature-sensor-g17) .
8. Coolant Fan -V7- and Coolant Fan 2 -V177- Different versions of the Coolant Fan and Coolant Fan 2 are installed depending on vehicle equipment. The request to switch on the coolant fan is sent by the Climatronic Control Module -J255- via the Data bus system to the engine control module. The engine control module then activates the fans (coolant fan and coolant fan 2) directly or via the coolant fan control module -J293-. Refer to appropriate SYSTEM WIRING DIAGRAM and «[For engine(s) CAUA] Description and Operation»(ref-520122-S38578899852012123100000) or to «[For engine(s) CAEB] Description and Operation»(ref-520126-S15924086162012123100000) or to «[For engine(s) CALA] Description and Operation»(/audi/a5/i-2007-2011/remont/cooling-fan/#32l-cooling-system-engine-codes-cala-coupe-as-of-122008) . Check the coolant fan control by the Climatronic control module -J255-. Refer to the Vehicle Diagnostic Tester in "Guided Fault Finding". The respective engine control modules switches, for example, the Coolant Fan and Coolant Fan 2 (directly or via the Coolant Fan Control (FC) Control Module -J293-) continuously to the desired output (depending on engine type). Refer to the Vehicle Diagnostic Tester in "Guided Fault Finding" and appropriate SYSTEM WIRING DIAGRAM.
9. Air Quality Sensor -G238- / Humidity Sensor In Fresh Air Intake Duct -G657- Different version, NOTE: There are different versions depending on the vehicle date of manufacture and which A/C system ("Basis" or "Comfort") is installed. The "Basis" A/C system does not have a humidity sensor in fresh air intake duct / air quality sensor until the MY 12 change-over. From MY 12 it has a humidity sensor in fresh air intake duct without an air quality sensor (black housing). Through MY 12, the "Comfort" A/C system has an air quality sensor without a humidity sensor in fresh air intake duct. From MY 12, it has a humidity sensor in fresh air intake duct with an air quality sensor, (brown housing). Vehicles with the "Comfort" A/C system have an air quality sensor without a humidity sensor in fresh air intake duct (from start of production up the change-over). Refer to «CLIMATRONIC CONTROL MODULE -J255- A/C CONTROL HEAD ALLOCATION»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__climatronic-control-module-j255-ac-control) Beginning with the MY 12 Audi A4 and Audi 5, the vehicle version was changed-over as a running change. Refer to «CLIMATRONIC CONTROL MODULE -J255- A/C CONTROL HEAD ALLOCATION»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__climatronic-control-module-j255-ac-control) . Vehicles, built before the change-over and with the "Comfort" A/C system, have an air quality sensor (not on the "Basis"). Vehicles built since this change-over (and on the Audi Q5 Hybrid): if the vehicle has the "Basis" A/C system, then it has a humidity sensor in fresh air intake duct; if the vehicle has the "Comfort" A/C system, then it has a humidity sensor in fresh air intake duct and an air quality sensor. Function, refer to «AIR QUALITY SENSOR -G238- AND HUMIDITY SENSOR IN FRESH AIR INTAKE DUCT -G657- FUNCTION»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__air-quality-sensor-g238-and-humidity) . Checking, refer to «AIR QUALITY SENSOR -G238- / HUMIDITY SENSOR IN FRESH AIR INTAKE DUCT -G657-, CHECKING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__air-quality-sensor-g238-humidity) . Removing and installing, refer to «AIR QUALITY SENSOR -G238- / HUMIDITY SENSOR IN FRESH AIR INTAKE DUCT -G657»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__air-quality-sensor-g238-humidity) . The vehicle electrical system control module -J519- evaluates the measurement from the air quality sensor / humidity sensor in fresh air intake duct and then transmits it to the Climatronic control module via the Data bus. The Climatronic control module switches to recirculating air mode when requested, for example, if there are no shut-off conditions present. Refer to the Vehicle Diagnostic Tester in "Guided Fault Finding".
10. Fresh Air Intake With Intake Grille Check cowl panel trim with the cover for the fresh air intake for correct installation and damage. Check the seals between the fresh air intake cover, the cowl panel trim and the window cross member for damage and proper fit. This seals prevent water from entering between window cross member and cover and running into A/C unit air intake shroud «Removal and Installation»(/audi/a5/i-2007-2011/remont/exterior-body-panels/#body-front-coupe) . Removing and installing, refer to «FRESH AIR INTAKE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__fresh-air-intake) . Make sure the intake grille fits correctly. The intake grille prevents foreign objects such as leaves from getting into the A/C intake shroud. Depending on the version, for some countries with high dust levels (for example China), a filter id installed instead of intake air grille, which prevents dust and sand from entering the fresh air blower. NOTE: The fresh air intake shaft may have an additional cover with a rain water drain channel depending on the version of the vehicle and the plenum chamber cover installed. Refer to «FRESH AIR INTAKE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__fresh-air-intake) .
11. Forced Air Extractor A forced air extraction vent is installed at left and right under rear bumper. Sealing doors on air extraction vent must be able to move freely and close automatically. In order for the passenger compartment ventilation to function properly, the air ducts that run through the luggage compartment trim must be unobstructed. Checking, refer to «PASSENGER COMPARTMENT FORCED AIR EXTRACTION»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__passenger-compartment-forced-air-extraction) .

Scheme 265

1. Refrigerant Line With Inner Heat Exchanger In this refrigerant line, liquid warm refrigerant from the high pressure side is released into the low pressure side as flowing vaporous refrigerant energy. This increases the cooing efficiency of the A/C system. Refrigerant line, removing and installing refer to «REFRIGERANT CIRCUIT COMPONENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) . Refrigerant line, quick-release coupling, disconnecting and connecting, refer to «REFRIGERANT LINES DISCONNECTING FROM QUICK-RELEASE COUPLINGS AND CONNECTING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__refrigerant-lines-disconnecting-from-quick-release-couplings) .
2. Expansion Valve Refrigerant lines with inner heat exchanger, disconnecting and reconnecting, refer to «REFRIGERANT CIRCUIT COMPONENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) . Removing and installing, refer to «EXPANSION VALVE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__expansion-valve) . NOTE: From the start of production through the change-over from MY 12, evaporators approximately 40 mm (1.6 in.) wide (block depth) are being installed (air conditioner part number "8K_ 820 005"). From MY 12, as a running change and depending on the version of the vehicle, an approximately 50 mm (2 in.) wide evaporator (block depth) is being installed (air conditioner part number "8T_ 820 005"). Pay attention to the correct allocation of the evaporator expansion valve (there are different versions).
3. Coolant Lines to the Heater Core Inside The Air Conditioner Coolant hoses, removing and installing, coolant circuit, bleeding, refer to «HEATER CORE/HOUSINGS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) .
4. Low Pressure Side Service Connection For measuring and discharging the refrigerant circuit, refer to «Description and Operation»(/audi/a5/i-2007-2011/remont/general-servicing-all-makes/#general-technical-data-refrigerant-r134a-servicing-coupe-1-of-2) . Cap and seal, always install. There are different versions (with primary sealing valve or with a Schrader valve) depending on the refrigerant line, characteristics. Refer to «Description and Operation»(/audi/a5/i-2007-2011/remont/general-servicing-all-makes/#general-technical-data-refrigerant-r134a-servicing-coupe-1-of-2) . NOTE: Depending on the allocation of the service connection an on the refrigerant line, and on the version of the vehicle, it may be necessary to remove the additional reinforcement on the left suspension strut dome so that the service coupling of the service station can be connected (for example, on the Audi Q5). Refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/suspension-front/#front-suspension-coupe) .
5. Refrigerant Line Quick Acting Coupling - Low Pressure Side WARNING: The quick acting coupling connectors may be unlocked and opened only if the refrigerant circuit is empty. Refrigerant line, quick-release coupling, disconnecting and connecting, refer to «REFRIGERANT LINES DISCONNECTING FROM QUICK-RELEASE COUPLINGS AND CONNECTING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__refrigerant-lines-disconnecting-from-quick-release-couplings) .
6. High Pressure Side Service Connection For measuring and discharging the refrigerant circuit, refer to «Description and Operation»(/audi/a5/i-2007-2011/remont/general-servicing-all-makes/#general-technical-data-refrigerant-r134a-servicing-coupe-1-of-2) . Cap and seal, always install. There are different versions (with primary sealing valve or with a Schrader valve) depending on the refrigerant line, characteristics. Refer to «Description and Operation»(/audi/a5/i-2007-2011/remont/general-servicing-all-makes/#general-technical-data-refrigerant-r134a-servicing-coupe-1-of-2) . NOTE: Depending on the allocation of the service connection an on the refrigerant line, and on the version of the vehicle, it may be necessary to remove the additional reinforcement on the left suspension strut dome so that the service coupling of the service station can be connected (for example, on the Audi Q5). Refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/suspension-front/#front-suspension-coupe) .
7. Refrigerant Line Quick-Release Coupling - High Pressure Side WARNING: The quick acting coupling connectors may be unlocked and opened only if the refrigerant circuit is empty.
8. Fluid Reservoir May only be removed when refrigerant circuit has been removed; bring vehicle to a workshop that has the necessary tools and in which the work can be performed accordingly by qualified personnel. Refer to «General Information»(/audi/a5/i-2007-2011/remont/general-servicing-all-makes/#general-technical-data-refrigerant-r134a-servicing-coupe-1-of-2__general-information) . The reservoir is attached directly to the condenser, refer to «FLUID RESERVOIR»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__fluid-reservoir) . Different versions. NOTE: The reservoir may be attached to or integrated in the condenser, depending on the version of the condenser. Refer to All vehicles «FLUID RESERVOIR»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__fluid-reservoir) or All except RS5 «DRYER CARTRIDGE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__dryer-cartridge) or RS5 «DRYER CARTRIDGE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) . Dryer cartridge (on a condenser with an integrated fluid reservoir), removing and installing, refer to All except RS5 «DRYER CARTRIDGE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__dryer-cartridge) or RS5 «DRYER CARTRIDGE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) .
9. Condenser May only be removed when refrigerant circuit has been discharged; bring vehicle to a workshop that has the necessary tools and in which the work can be performed accordingly by qualified personnel. Refer to «General Information»(/audi/a5/i-2007-2011/remont/general-servicing-all-makes/#general-technical-data-refrigerant-r134a-servicing-coupe-1-of-2__general-information) . There are different versions depending on the vehicle equipment level, Refrigerant lines, removing and installing, refer to «REFRIGERANT CIRCUIT COMPONENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) . Condenser, removing and installing, refer to «REFRIGERANT CIRCUIT COMPONENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) . NOTE: It may be necessary to evacuate the refrigerant circuit and remove the refrigerant pipes from the condenser in order to remove the condenser from the front end or to remove the radiator depending on the version of the radiator and the condenser (for example, on the Audi RS 4 and the Audi RS 5). Refer to «REFRIGERANT CIRCUIT COMPONENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) .
10. A/C Pressure/Temperature Sensor -G395- Removing and installing, refer to «A/C PRESSURE/TEMPERATURE SENSOR -G395»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__ac-pressuretemperature-sensor-g395) . Checking the signal, refer to Vehicle diagnostic tester in the "Guided Fault Finding" function. NOTE: The A/C pressure/temperature sensor exchanges information with the Vehicle electrical system control module -J519- via the "LIN-bus". Refer to «A/C PRESSURE/TEMPERATURE SENSOR -G395-, CHECKING PRESSURE SIGNAL»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__ac-pressuretemperature-sensor-g395-checking-pressure) .
11. Mechanically Driven A/C Compressor NOTE: For vehicles with 6 or 8-cylinder engine, the A/C compressor may be dismantled and removed from the mount only when the refrigerant circuit is open. Refer to «COMPRESSOR»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) . At start of production, A/C compressors manufactured by "Denso" (type "6 SEU 14") on 4 and 6 cylinder vehicles Engine and type "7 SEU 17" on vehicles with 8 cylinders FSI engine) installed. Compressors from other manufacturers may also be installed at a later time. Refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#general-technical-data-refrigerant-r134a-servicing-coupe-2-of-2) . Additional information, refer to «REFRIGERANT CIRCUIT COMPONENT OVERVIEW»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__refrigerant-circuit-component-overview-engine) .
12. A/C Compressor Regulator Valve -N280- For checking activation and functionality, refer to «A/C COMPRESSOR REGULATOR VALVE -N280-, CHECKING SWITCH-ON SIGNAL»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__ac-compressor-regulator-valve-n280-checking) . NOTE: Installed only on vehicles equipped with a mechanically driven A/C compressor.

Scheme 266

1. Coolant Recirculation Pump -V50- (Water Pump -V36-) Component location on 6 cylinder FSI vehicles, refer to «COOLANT RECIRCULATION PUMP -V50- (WATER PUMP -V36-)»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2) . NOTE: For vehicles with 6 cylinders, depending on the vehicle version, may have a coolant pump (water pump) installed in this location. Refer to «[For engine(s) CALA] Description and Operation»(/audi/a5/i-2007-2011/remont/cooling-fan/#32l-cooling-system-engine-codes-cala-coupe-as-of-122008) . Depending on the version of the Climatronic control module -J255-, coolant pump -V50- may be referred to as water pump -V36- in Guided Fault Finding. Refer to the Vehicle Diagnostic Tester in "Guided Fault Finding" function. For vehicles with 8 FSI engine, the A/C compressor may be dismantled and removed from the mount only when the refrigerant circuit is open. The FSI engine currently does not have a coolant recirculation pump (introduction is still open). Refer to «[For engine(s) CAUA] Description and Operation»(ref-520122-S38578899852012123100000) The coolant pump (water pump) versions and activation differ depending on the version of the vehicle and production period. From MY 12 beginning with start of production, pumps that were controlled by a 500 Hertz signal (500 pulses per second) are being replaced by pumps that are controlled by a 100 Hertz signal depending on the engine. Pumps, controlled by a 100 Hertz signal, also have a diagnostic function and are controlled by the engine control module. Check for the correct allocation; refer to the Vehicle Diagnostic Tester in "Guided Fault Finding" function, to the appropriate SYSTEM WIRING DIAGRAM.
2. Coolant Recirculation Pump -V50- (Water Pump -V36-) Component location on vehicles with a 4-cylinder engine, refer to «COOLANT RECIRCULATION PUMP -V50- (WATER PUMP -V36-)»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__coolant-recirculation-pump-v50-water-pump) . NOTE: The coolant recirculation pump (water pump) is installed only on MY 10 vehicles equipped with the "Start/Stop System" but without an "auxiliary heater". Refer to «COOLANT RECIRCULATION PUMP -V50- (WATER PUMP -V36-)»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__coolant-recirculation-pump-v50-water-pump) . Depending on the version of the Climatronic control module -J255-, coolant pump may be referred to as water pump in Guided Fault Finding. Refer to the Vehicle Diagnostic Tester in "Guided Fault Finding" function. The coolant recirculation pump (water pump) versions and activation differ depending on the version of the vehicle and production period. From MY 12 beginning with start of production, pumps that were controlled by a 500 Hertz signal (500 pulses per second) are being replaced by pumps that are controlled by a 100 Hertz signal depending on the engine. Pumps, controlled by a 100 Hertz signal, also have a diagnostic function and are controlled by the engine control module. Check for the correct allocation; refer to the Vehicle Diagnostic Tester in "Guided Fault Finding" function, to the appropriate SYSTEM WIRING DIAGRAM. The Coolant recirculation pump can be installed in different locations. It is located between the plenum chamber bulkhead and the engine on most 4 cylinder vehicles. The activation of the coolant recirculation pump varies. If the vehicle has a high voltage system (hybrid vehicles), then the Climatronic control module requests the activation via the engine control module. Refer to the Vehicle Diagnostic Tester in "Guided Fault Finding" function and to appropriate SYSTEM WIRING DIAGRAM.

CLIMATRONIC REFRIGERANT SHUT-OFF VALVE -N422- / COOLANT SHUT-OFF VALVE -N82- LOCATION, CONTROL AND FUNCTION

Note. On certain vehicles (depending on the engine), vacuum-controlled coolant shut-off valves -A- were installed on vehicles without an "auxiliary heater" from start of production. Electrically controlled shut-off valves -B- were introduced later as a running change. These valves are referred to as a climatronic refrigerant shut-off valve -N422- or a coolant shut-off valve -N82- depending on the engine version and on the time of production. Refer to appropriate SYSTEM WIRING DIAGRAM and the Vehicle Diagnostic Tester in "Guided Fault Finding" function. Pay attention to the flow direction of the coolant -arrow- when installing. This valve is referred to as a climatronic refrigerant shut-off valve -N422- or a coolant shut-off valve -N82- depending on the engine version and on the time of production. Refer to appropriate SYSTEM WIRING DIAGRAM and the Vehicle Diagnostic Tester in "Guided Fault Finding" function. The activation of the Climatronic refrigerant shut-off valve / coolant shut-off valve depends on the version of the vehicle (either by the Climatronic control module -J255- or by the engine control module). Refer to appropriate SYSTEM WIRING DIAGRAM.

Information regarding a coolant shut-off valve activated by vacuum

The component location and version of the climatronic refrigerant shut-off valve -B- and of the coolant shut-off valve -A- depends on the engine, the version of the vehicle and on the production date.

Scheme 267

Scheme 268

1. This illustration shows the allocation and version of the Climatronic refrigerant shut-off valve -B- with a 6 cylinder FSI engine as installed at the start of production. Version "1" Climatronic refrigerant shut-off valve -B- is installed near the cylinder head.
2. The Climatronic refrigerant shut-off valve -B- is installed in the plenum chamber in certain vehicles (Audi Q5 with a 6-cylinder diesel engine). This illustration shows version "2" of the Climatronic refrigerant shut-off valve.
3. The Climatronic refrigerant shut-off valve was installed only on vehicles with a 6 cylinder FSI engine at start of production. It was introduced on other engine as a running change in MY 2008. The exact introduction depends on the vehicle equipment level and the build date. Refer to «[For engine(s) CALA] Description and Operation»(/audi/a5/i-2007-2011/remont/cooling-fan/#32l-cooling-system-engine-codes-cala-coupe-as-of-122008) .

Make sure the vacuum hoses are attached correctly when installing the Climatronic refrigerant shut-off valve -B-.

Scheme 269

1. The vacuum hose to the shut-off valve -A- is attached to the connection "3" -C- on version "1" The vacuum supply from the engine comes from the connection "2" -D-.
2. On version "2" the vacuum hose -C- to the shut-off valve -A- is connected to connection "3". The vacuum supply from the engine comes from the connection "2" -D-.
3. The illustration shows the allocation on a MY 2009 4-cylinder diesel engine.
4. The ventilation of the shut-off valve vacuum diaphragm -A-, for example, on version "2" of the Climatronic refrigerant shut-off valve -B- occurs via the connection "1" under the cap -E-.
5. The vacuum hose -C- (leading to the shut-off valve -A-) is identified with a white mark, depending on the version.

1. The Climatronic control module -J255- display and control head checks the Climatronic refrigerant shut-off valve -B- for functionality in specific time intervals, for example, after every 20 engine starts. If the vacuum hoses are incorrectly connected to the Climatronic refrigerant shut-off valve -B-, then the coolant shut-off valve -A- is activated briefly. If the hoses are interchanged, the vacuum will remain in the vacuum hose vacuum diaphragm -A- for an undetermined amount of time after the activation is completed. The shut-off valve -A- will not open. Coolant will flow into the heater core and the A/C system will not heat when the shut-off valve -A- is closed.
2. If the vacuum hoses are connected incorrectly, the engine will still take in some fresh air through the connection "1" on the Climatronic refrigerant shut-off valve. This can lead to additional problems in the engine idle RPM which will be entered in the engine control module data memory.

Information for all

Scheme 270

1. An electric shut-off valve -B- or a vacuum-controlled coolant shut-off valve -A- is installed either in the plenum chamber or in the engine compartment depending on the engine and the vehicle version.
2. The Climatronic refrigerant shut-off valve / coolant shut-off valve can then be activated by the A/C controls (either directly or by the engine control module) when the A/C system is "OFF". The engine RPM must be lower than 5, 000 and the coolant temperature must be below 90 °C (194 °F). Shutting off the coolant circuit to the A/C heater core accelerates the engine warming up when the coolant is cold.
3. The Climatronic refrigerant shut-off valve can be switched off by the "adaptation" function in the A/C system. Refer to Vehicle Diagnostic Tester under "Guided Fault Finding".
4. Depending on the version of the Climatronic control module -J255-, coolant pump -V50- may be referred to as water pump -V36- in Guided Fault Finding. Refer to the Vehicle Diagnostic Tester under "Guided Fault Finding".
5. The coolant pump (water pump) is controlled by the recirculation pump relay -J160- (via the same output as the climatronic refrigerant shut-off valve -N422-) or, as a running change in MY 09, directly by the Climatronic control module. Activation takes place after the Climatronic control module makes the request via the engine control module on certain vehicles (Audi Q5 Hybrid). Pay attention to the correct version of the Climatronic control module -J255- and the correct coding and adaptation. Refer to the Vehicle Diagnostic Tester under "Guided Fault Finding". and appropriate SYSTEM WIRING DIAGRAM.
6. If the vehicle has a recirculation pump relay -J160- (for example, MY 08 vehicles), then the coolant recirculation pump (water pump) is always activated when the ignition is turned on, when the Climatronic refrigerant shut-off valve -N422- / coolant shut-off valve -N82- is not on (for example, when the temperature is set to "warm" on the Climatronic control module A/C control head). Refer to «COOLANT RECIRCULATION PUMP -V50- (WATER PUMP -V36-)»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2) and to appropriate SYSTEM WIRING DIAGRAM.
7. With the ignition on and depending on the coolant temperature the setting on the Climatronic control module, the coolant recirculation pump (water pump) is activated by a request from the Climatronic control module via the engine control module on certain vehicles (for example, Audi Q5 Hybrid) without a recirculation pump relay -J160- (running change from MY 09). Refer to «COOLANT RECIRCULATION PUMP -V50- (WATER PUMP -V36-)»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2) and to appropriate SYSTEM WIRING DIAGRAM.
8. The coolant recirculation pump (water pump) Climatronic refrigerant shut-off valve activation depends on the vehicle equipment level and the vehicle date of manufacture. Refer to Vehicle Diagnostic Tester in "Guided Fault Finding" function and appropriate SYSTEM WIRING DIAGRAM.
9. If the vehicle has a coolant recirculation pump (water pump) and a Climatronic refrigerant shut-off valve / coolant shut-off valve that are activated directly by the Climatronic control module, then the Climatronic control module will store any faults on these components. Pay attention to the version, the coding and the adaptation on the Climatronic control module. Check using the Vehicle Diagnostic Tester under "Guided Fault Finding".
10. The coolant recirculation pump (water pump) versions and activation differ depending on the version of the vehicle and production period. From MY 12 beginning with start of production, pumps that were controlled by a 500 Hertz signal (500 pulses per second) are being replaced by pumps that are controlled by a 100 Hertz signal depending on the engine. Pumps, controlled by a 100 Hertz signal, also have a diagnostic function and are controlled by the engine control module. Check for the correct allocation; refer to Vehicle Diagnostic Tester in "Guided Fault Finding" function, to the appropriate SYSTEM WIRING DIAGRAM.

COOLANT RECIRCULATION PUMP -V50- (WATER PUMP -V36-)

Note. Depending on the version of the Climatronic control module -J255- A/C control head, coolant recirculation pump may be referred to as water pump in Guided Fault Finding. Refer to the Vehicle Diagnostic Tester in "Guided Fault Finding" function. The coolant recirculation pump (water pump) versions and activation differ depending on the version of the vehicle and production period. From MY 12 beginning with start of production, pumps that were controlled by a 500 Hertz signal (500 pulses per second) are being replaced by pumps that are controlled by a 100 Hertz signal depending on the engine. Pumps, controlled by a 100 Hertz signal, also have a diagnostic function and are controlled by the engine control module. Check for the correct allocation; refer to Refer to the Vehicle Diagnostic Tester in "Guided Fault Finding" function, to the appropriate SYSTEM WIRING DIAGRAM. The Coolant recirculation pump can be installed in different locations. Fro vehicles with a high voltage system (hybrid vehicles) it is located between the plenum chamber bulkhead and the engine. The activation of the coolant recirculation pump varies. For vehicles with the high voltage system (hybrid vehicles) the activation is carried out according to the requirements of the Climatronic control module via the respective engine control module. Refer to the appropriate SYSTEM WIRING DIAGRAM.

Scheme 271

1. For vehicles with 4 cylinders engines with the "Start/Stop System" but not having an "auxiliary heater" have a coolant recirculation pump (water pump). Refer to «Description and Operation»(ref-520126-S15924086162012123100000) . The coolant pump (water pump) activation depends on the vehicle equipment level and the vehicle date of manufacture. Refer to the Vehicle Diagnostic Tester in "Guided Fault Finding" function and appropriate SYSTEM WIRING DIAGRAM.
2. The coolant pump (water pump) -A- is installed between the engine and the plenum chamber on 4-cylinder vehicles with the "Start/Stop System" but without an "auxiliary heater". Refer to «Removal and Installation»(ref-520126-S07155360692012123100000) .
3. This illustration shows the location on a MY 10 Audi A4 with a 4 cylinder TFSI engine. The coolant pump (water pump) -A- can also be installed in a different location (for example, inside the plenum chamber) depending on the engine, vehicle model and date of manufacture. Refer to «Removal and Installation»(ref-520126-S07155360692012123100000) .
4. When the coolant pump (water pump) is working, the coolant flows through the coolant hose -B- (from the engine through the A/C heater core and coolant shut-off valve -D-) and then back to the engine through the coolant hose -C- (flow direction -arrows-).
5. The coolant pump (water pump) is controlled directly when the ignition is turned on and depending on the coolant temperature and on the setting on the Climatronic control unit -J255-. Refer to the Vehicle Diagnostic Tester in "Guided Fault Finding" function and appropriate SYSTEM WIRING DIAGRAM.
6. The coolant pump (water pump) is controlled not only when the "Start/Stop System" is on, but also when the engine is running and when the temperature is set to "warm" on the Climatronic control module ("HI" appears in the display on the A/C control head and in the MMI). The coolant pump is activated to support the engine coolant pump. Check using the Vehicle Diagnostic Tester under "Guided Fault Finding".
7. The Climatronic control module or the engine control model directly activates the coolant recirculation pump (water pump) and the climatronic refrigerant shut-off valve -N422- /coolant shut-off valve -N82- on vehicles with "Start/Stop" If any faults on any of the Climatronic control module components are stored, check the version, coding and adaptation. Refer to the Vehicle Diagnostic Tester under "Guided Fault Finding".

Note. Depending on the version of the Climatronic control module -J255- A/C control head, coolant pump -V50- may be referred to as water pump -V36- in Guided Fault Finding. Refer to the Vehicle Diagnostic Tester in "Guided Fault Finding" function. The coolant pump (water pump) versions and activation differ depending on the version of the vehicle and production period. From MY 12 beginning with start of production, pumps that were controlled by a 500 Hertz signal (500 pulses per second) are being replaced by pumps that are controlled by a 100 Hertz signal depending on the engine. Pumps, controlled by a 100 Hertz signal, also have a diagnostic function and are controlled by the engine control module. Check for the correct allocation; refer to the Vehicle Diagnostic Tester in "Guided Fault Finding" function, to the appropriate SYSTEM WIRING DIAGRAM.

Scheme 272

1. For vehicles with 6 cylinder FSI (currently not on 6 cylinder TFSI vehicles) and on other engines with certain options (for example, vehicles with "Start/Stop") but without an "auxiliary heater" have a coolant pump (water pump). Refer to «Description and Operation»(/audi/a5/i-2007-2011/remont/cooling-fan/#32l-cooling-system-engine-codes-cala-coupe-as-of-122008) . The coolant pump (water pump) activation depends on the vehicle equipment level and the vehicle date of manufacture. Refer to the Vehicle Diagnostic Tester in "Guided Fault Finding" function and appropriate SYSTEM WIRING DIAGRAM.
2. For vehicles with 6 cylinder the coolant recirculation pump (water pump) -A- is installed between the engine and the right longitudinal member under the right headlamp. The illustration shows the location on an Audi A5 Coupe with a 6 cylinder FSI engine, on an Audi A5 Sportback, an Audi A4, an Audi Q5 etc. The location of the components may be different on vehicles with a different engine. Refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/cooling-fan/#32l-cooling-system-engine-codes-cala-coupe-as-of-122008__removal-and-installation) .
3. When the coolant pump (water pump) is running, the coolant flows from the engine through the coolant hose -B- and through the coolant hose -C- to the heater core inside the air conditioner (note the flow direction -arrows-).
4. As of MY 09, the coolant pump (water pump) is controlled directly by the Climatronic control module -J255- depending on the date of manufacture and via the recirculation pump relay -J160- (by the same output like the Climatronic refrigerant shut-off valve -N422-). Refer to appropriate SYSTEM WIRING DIAGRAM and the Vehicle Diagnostic Tester in "Guided Fault Finding" function.
5. On vehicles with a recirculation pump relay -J160- (for example, MY 08 vehicles) the coolant pump (water pump) is always activated when the ignition is turned on, when the Climatronic refrigerant shut-off valve -N422- is not on (for example, when the temperature is set to "warm" on the Climatronic control module). Refer to appropriate SYSTEM WIRING DIAGRAM and «COOLANT RECIRCULATION PUMP -V50- (WATER PUMP -V36-)»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2) .
6. On vehicles without a recirculation pump relay -J160- (running change in MY 09), the coolant pump (water pump) is controlled by the setting on the Climatronic control module, depending on the coolant temperature with the ignition turned on. Refer to the Vehicle Diagnostic Tester in "Guided Fault Finding" function and appropriate SYSTEM WIRING DIAGRAM.
7. The coolant pump (water pump) is controlled not only when the "Stop Function" is active (option, running change in MY 10) but also, with the engine running, when the temperature setting is set to "warm" on the Climatronic control module ("HI" appears in the A/C control head display and in the MMI). The coolant pump is activated to support the engine coolant pump. Check using the Vehicle Diagnostic Tester in "Guided Fault Finding" function.
8. If the vehicle has a coolant pump (water pump) and a Climatronic refrigerant shut-off valve / coolant shut-off valve that are activated directly by the Climatronic control module, then the Climatronic control module will store any faults on these components. Pay attention to the version, the coding and the adaptation on the Climatronic control module using the Vehicle Diagnostic Tester in "Guided Fault Finding" function.

COMPONENTS IN ENGINE COMPARTMENT

With high voltage systems (hybrid vehicles)

Scheme 273

1. Coolant Fan -V7- And Coolant Fan 2 -V177- For additional information, refer to «COMPONENTS OUTSIDE OF VEHICLE INTERIOR (ALL VEHICLES)»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2) .
2. Outside Air Temperature Sensor -G17- For additional information, refer to «COMPONENTS OUTSIDE OF VEHICLE INTERIOR (ALL VEHICLES)»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2) .
3. Label With specifications for type of refrigerant and designated fill capacity, refer to «Specifications»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#general-technical-data-refrigerant-r134a-servicing-coupe-2-of-2) .
4. Fresh Air Intake With Intake Grille For additional information, refer to «COMPONENTS OUTSIDE OF VEHICLE INTERIOR (ALL VEHICLES)»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2) .
5. Air Quality Sensor -G238- / Humidity Sensor In Fresh Air Intake Duct -G657- For additional information, refer to «COMPONENTS OUTSIDE OF VEHICLE INTERIOR (ALL VEHICLES)»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2) .
6. Condensation Drain For additional information, refer to «COMPONENTS OUTSIDE OF VEHICLE INTERIOR (ALL VEHICLES)»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2) .
7. Plenum Chamber Water Drain For additional information, refer to «COMPONENTS OUTSIDE OF VEHICLE INTERIOR (ALL VEHICLES)»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2) .
8. Electric Drive Power and Control Electronics -JX1- Read and follow all of the supplemental warnings when working on the electric drive power and control electronics and vehicles with the high voltage system. Refer to «HIGH VOLTAGE SYSTEM (HYBRID VEHICLES) REPAIRS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__high-voltage-system-hybrid-vehicles-repairs) .
9. Climatronic Refrigerant Shut-Off Valve -N422- / Coolant Shut-Off Valve -N82- On certain vehicles (depending on the engine), vacuum-controlled coolant shut-off valves were installed on vehicles without an "auxiliary heater" from start of production. Shut-off valves that are directly activated were introduced as a later time as a running change. This valve may be referred to as the Climatronic refrigerant shut-off valve -N422- or the coolant shut-off valve -N82- depending on the engine version and when the vehicle was produced. Refer to «CLIMATRONIC REFRIGERANT SHUT-OFF VALVE -N422- / COOLANT SHUT-OFF VALVE -N82- LOCATION, CONTROL AND FUNCTION»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__climatronic-refrigerant-shut-off-valve-n422) . For additional information, refer to «COMPONENTS OUTSIDE OF VEHICLE INTERIOR (ALL VEHICLES)»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2) .
10. Plenum Chamber Water Drain For additional information, refer to «COMPONENTS OUTSIDE OF VEHICLE INTERIOR (ALL VEHICLES)»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2) .
11. Coolant Recirculation Pump -V50- For additional information, refer to «COMPONENTS OUTSIDE OF VEHICLE INTERIOR (ALL VEHICLES)»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2) .
12. Refrigerant Line Connections to the Evaporator Inside the Battery Cooling Module WARNING: The bolts of the connection point may only be loosened when the refrigerant circuit has been discharged.
13. Hybrid Battery Refrigerant Shut-Off Valve 1 -N516- Installed inside the engine compartment near the left suspension strut tower. Check using the Vehicle diagnostic tester in the "Guided Fault Finding" function. NOTE: The Hybrid battery refrigerant shut-off valve 1 is for example activated, if the battery needs to be cooled and the vehicle interior is not already being cooled (open without activation). Removing and installing, refer to «HYBRID BATTERY REFRIGERANT SHUT-OFF VALVE 1 -N516»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__hybrid-battery-refrigerant-shut-off-valve-1) .
14. Electric A/C Compressor -V470- With A/C compressor control module -J842- and electric A/C compressor A/C Compressor, removing and installing on bracket, Vehicles with 4 Cylinder engine, refer to «ELECTRIC A/C COMPRESSOR REMOVING FROM BRACKET»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__electric-ac-compressor-removing-from-bracket) 1) . NOTE: Depending on time period of production and on engine, compressor construction type may vary. These A/C compressors are available as replacement parts with different oil fill capacities. Therefore, note the capacity on the A/C compressor and the exact part number and «Specifications»(/audi/a5/i-2007-2011/remont/general-servicing-all-makes/#general-technical-data-refrigerant-r134a-servicing-coupe-1-of-2) . Depending on A/C compressor type, different refrigerant oil fill capacities may be designated for the refrigerant circuit. The reason for the different oil capacities in the A/C compressor for an otherwise identical refrigerant circuit is the design of the compressor. Observe these oil capacities. Too much oil in the refrigerant circuit increases the pressures and reduces the cooling output of the A/C system. Too little oil can result in lubrication problems in the A/C compressor. Refer to «Specifications»(/audi/a5/i-2007-2011/remont/general-servicing-all-makes/#general-technical-data-refrigerant-r134a-servicing-coupe-1-of-2) . When installing refrigerant pipes and the corresponding bracket, make sure there is adequate distance between the other components (such as the belt, belt pulley for the engine, etc.).

COMPONENTS ON FLOOR PANEL

With high voltage systems (hybrid vehicles)

Scheme 274

1. Screw
2. Low Pressure Refrigerant Line On the rear underbody
3. O-ring Seal Replace
4. Pass-Through For The Refrigerant Lines In The Luggage Compartment Removing and installing, refer to «PASS-THROUGH REFRIGERANT LINES IN LUGGAGE COMPARTMENT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__pass-through-refrigerant-lines-in-luggage-compartment) .
5. O-ring Seal Replace
6. High Pressure Refrigerant Line On the rear underbody
7. Screw
8. Screw
9. High Pressure Refrigerant Line On the front underbody
10. O-ring seal Replace
11. High Pressure Refrigerant Line On the rear underbody
12. Screw
13. Low Pressure Refrigerant Line On the rear underbody
14. O-ring Seal Replace
15. Low Pressure Refrigerant Line On the front underbody
16. Screw
17. Low Pressure Refrigerant Line On the front underbody
18. O-ring Seal Replace
19. Low Pressure Refrigerant Line In the engine compartment
20. Screw
21. High Pressure Refrigerant Line On the front underbody
22. O-ring Seal Replace
23. High Pressure Refrigerant Line In the engine compartment
24. Sheet Metal Nut
25. High Pressure Refrigerant Line On the underbody
26. Low Pressure Refrigerant Line On the underbody

COMPONENTS IN LUGGAGE COMPARTMENT

With high voltage systems (hybrid vehicles)

Scheme 275

1. Hybrid Battery Recirculation Door Positioning Motor 1 -V479- Removing and installing, refer to «HYBRID BATTERY RECIRCULATION DOOR POSITIONING MOTORS 1 AND 2 -V479- / -V480»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__hybrid-battery-recirculation-door-positioning-motors) .
2. Expansion Valve With Hybrid Battery Refrigerant Shut-Off Valve 2 -N517- Removing and installing, refer to «EXPANSION VALVE WITH HYBRID BATTERY REFRIGERANT SHUT-OFF VALVE 2 -N517»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__expansion-valve-with-hybrid-battery-refrigerant) .
3. Opening for Refrigerant Lines Removing and installing, refer to «PASS-THROUGH REFRIGERANT LINES IN LUGGAGE COMPARTMENT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__pass-through-refrigerant-lines-in-luggage-compartment) .
4. Battery Fan 1 -V457- Removing and installing, refer to «BATTERY FAN 1 -V457»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__battery-fan-1-v457) .
5. Hybrid Battery Recirculation Door Positioning Motor 2 -V480- Removing and installing, refer to «HYBRID BATTERY RECIRCULATION DOOR POSITIONING MOTORS 1 AND 2 -V479- / -V480»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__hybrid-battery-recirculation-door-positioning-motors) .
6. Temperature Sensor Before Hybrid Battery Evaporator -G756- Removing and installing, refer to «TEMPERATURE SENSOR BEFORE -G756- AND AFTER HYBRID BATTERY EVAPORATOR -G757»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__temperature-sensor-before-g756-and-after) .
7. Temperature Sensor After Hybrid Battery Evaporator -G757- Removing and installing, refer to «TEMPERATURE SENSOR BEFORE -G756- AND AFTER HYBRID BATTERY EVAPORATOR -G757»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__temperature-sensor-before-g756-and-after) .

Note. Refer to AIR GUIDES FOR BATTERY COOLING MODULE OVERVIEW Refer to BATTERY COOLING MODULE OVERVIEW

ELECTRIC A/C COMPRESSOR OVERVIEW

Note. With A/C compressor control module -J842- and electric A/C compressor -V470- If the A/C compressor control module is faulty, the refrigerant oil quantity must conform to the new A/C compressor. Do not flush the refrigerant circuit with R134a. Refer to Removal and Installation . For more information regarding the A/C compressor, refer to ELECTRIC A/C COMPRESSOR REMOVING FROM BRACKET and Description and Operation .

Scheme 276

1. Electric A/C Compressor With A/C compressor control module -J842- and electric A/C compressor -V470- Removing from bracket, refer to «ELECTRIC A/C COMPRESSOR REMOVING FROM BRACKET»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__electric-ac-compressor-removing-from-bracket) . Removing and installing, refer to «ELECTRIC A/C COMPRESSOR»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__electric-ac-compressor) .
2. O-ring Seal Replacing
3. Refrigerant Line High pressure side
4. Screw M8 thread - 25 Nm M6 thread - 9 Nm
5. High Voltage Line to Electric Drive Power and Control Electronics -JX1
6. O-ring Replace
7. Refrigerant Line Low pressure side
8. Screw M8 thread - 25 Nm M6 thread - 9 Nm
9. Bolt Tightening specification 25 Nm

GLOVE COMPARTMENT COOLING TO AIR INTAKE MANIFOLD CONNECTION

Note. From 01.2008, A/C units which have an additional connection for the glove compartment cooling are being installed. On vehicles without glove compartment cooling, this connection is sealed with a plug. On an air intake housing -D- with a connection for glove compartment cooling -C- the strap -E- is approximately 3 mm longer than on the version with the glove compartment cooling connection -C-, be sure to pay attention to the correct allocation. If an air intake housing -D- with a connection for glove compartment cooling -C- is installed into a vehicle, which before did not have an intake air housing -D- with a connection for glove compartment cooling -C-, then the pin -A- on the right heater core housing -B- must be shortened by approximately 3 mm (different versions). On vehicles with an air intake housing -D- with a glove compartment cooling connection -C- but without the option "glove compartment cooling", the connection -C- is sealed with a plug -F-. If the vehicle has the option "glove compartment cooling" then remove the plug -F- from the glove compartment cooling -C-. On vehicles with "glove compartment cooling", the cooled air is routed from the A/C through the connection -C- and the air guide on the air intake housing -A- into the glove compartment. The foam seal seals the air guide and the glove compartment -B-. Make sure the vehicle has the correct version of the glove compartment. Refer to Description and Operation .

HEATER CORE HOUSING TEMPERATURE DOORS

Note. On the "Comfort" A/C system, the front right temperature doors, item 1 1 and the front left, item 2 2 are each actuated by one control motor (Right Temperature Door Motor -V159- and Left Temperature Door Motor -V158-). Both temperature doors for the rear right vents, item 3 3 and the rear left, item 4 4 are connected to each other by a connector rod; they are actuated via the Rear Temperature door Motor -V137-. Refer to A/C UNIT . On the "Basis" A/C system, the temperature door for the right instrument panel vents, item 1 1 and the front and rear right footwell vents, item 3 3 as well as the temperature door for the left instrument panel vents, item 2 2 and the front and rear left footwell vents, item 4 4 are connected to each other by the shafts (item 13 13 and item 12 12 ). The right temperature door shafts, item 3 3 and the left temperature door shafts, item 4 4 are connected to each other by a connector rod; they are both actuated by the Temperature Regulator door Motor -V68-. Refer to A/C UNIT .

Scheme 277

1. Upper Right Temperature Door On the "Comfort" A/C system, for the right and center instrument panel vents as well as the front right footwell vent. On the "Basis" A/C system, for the right and center instrument panel vents. In this illustration, the temperature door is shown in the "heat" position. NOTE: The "Basis" A/C system does not have separating walls, therefore, air does not get diffused after it has left the auxiliary air heater heating element -Z35- / honey comb.
2. Upper Left Temperature Door On the "Comfort" A/C system, for the left and left center instrument panel vents as well as for the front left footwell vent On the "Basis" A/C system, for the left and center instrument panel vents, item 1 1 . In this illustration, the temperature door is shown in the "cooling" position.
3. Lower Right Temperature Door On the "Comfort" A/C system, for the rear right footwell vents On the "Basis" A/C system, for the front right and rear right footwell vents, item 1 1 . In this illustration, the temperature door is shown in the "cooling" position.
4. Lower Left Temperature Door On the "Comfort" A/C system, for the rear left footwell vents On the "Basis" A/C system, for the left front and the left rear footwell vents, refer to item 1 1 . In this illustration, the temperature door is shown in the "heat" position.
5. Right heater core Housing Different versions, depending on the ("Comfort" and "Basis" A/C systems).
6. Left heater core Housing Different versions, depending on the ("Comfort" and "Basis" A/C systems).
7. Heater Core Covered with different foam seals, depending on the ("Comfort" and "Basis" A/C systems). Refer to «HEATER CORE/HOUSINGS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) .
8. Foam Seal Only on vehicle equipped with the "Comfort" A/C system; present to separate the air flow between the right and left side.
9. Foam Seal Only on vehicle equipped with the "Comfort" A/C system; present to separate the air flow between the front and rear.
10. Auxiliary Air Heater Heating Element -Z35- / Honey Comb Covered with different foam seals, depending on the ("Comfort" and "Basis" A/C systems). Refer to «AUXILIARY AIR HEATER HEATING ELEMENT -Z35- / HONEY COMB»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__auxiliary-air-heater-heating-element-z35) . NOTE: In MY 2009, as a running change, a new version of the auxiliary air heater heating element -Z35- is being installed (the heating element is a bit more narrow); be sure to use the correct version and note the allocation.
11. Foam Seal Only on vehicle equipped with the "Comfort" A/C system; present to separate the air flow between the right and left side.
12. Upper Temperature Door Shaft On the "Basis" A/C system, connected with the shaft, item 13 13 (the doors move together).
13. Lower Temperature Door Shaft On the "Basis" A/C system, connected with the shaft, item 12 12 (the doors move together).
14. Upper Temperature Door Shaft On the "Comfort" A/C system, located in the shaft, item 15 15 (the doors move independent of each other).
15. Lower Temperature Door Shaft On the "Comfort" A/C system, located in the shaft, item 14 14 (the doors move independent of each other).

REFRIGERANT CIRCUIT COMPONENT OVERVIEW - ENGINE CODE(S): CAEB & CALA

HD = High-pressure end

ND = Low-pressure end

Arrows point in direction of refrigerant flow.

The parts identified with 1) can be serviced or replaced by any workshop. The work procedures identified with 1) can be performed by any workshop. These components and work procedures do not affect the refrigerant circuit.

Refrigerant circuit components not identified with 1) cannot be serviced or replaced by all workshops. This also applies to all refrigerant hoses and refrigerant lines. Components not identified with 1) can only be serviced or replaced by a workshop that has all the necessary equipment and tools. In these workshops only trained technicians may perform this work. The refrigerant circuit must be drained. Refer to A/C Service Station in Description and Operation .

Scheme 278

1. A/C Compressor Regulator Valve -N280- Do not remove Checking activation and function, refer to «A/C COMPRESSOR REGULATOR VALVE -N280-, CHECKING SWITCH-ON SIGNAL»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__ac-compressor-regulator-valve-n280-checking) 1) . NOTE: The A/C compressor regulator valve -N280- is actuated by the Climatronic control module -J255- display and control head via the vehicle electrical system control module -J519-. The A/C compressor regulator valve -N280- controls the pressure on the refrigerant circuit low pressure side. Refer to Vehicle Diagnostic Tester under "Guided Fault Finding".
2. A/C Compressor A/C compressor refrigerant line, disconnecting and reconnecting, refer to «REFRIGERANT CIRCUIT COMPONENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) . Remove the ribbed belt. Refer to «[For engine(s) CAUA] Removal and Installation»(ref-520095-S27461045592012123100000) or to «[For engine(s) CAEB] Removal and Installation»(ref-520099-S42505259302012123100000) or to «[For engine(s) CALA] Removal and Installation»(/audi/a5/i-2007-2011/remont/mechanical/#32l-crankshaft-cylinder-block-engine-codes-cala-coupe-as-of-122008) . A/C compressor, removing and installing, refer to «A/C COMPRESSOR»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__ac-compressor) . NOTE: When installing the refrigerant pipes and mounts, make sure there is enough space between the belt, the bracket, the belt pulley and the refrigerant pipes. To protect the A/C compressor, the engine should only be started with the refrigerant circuit completely assembled. NOTE: For vehicles with 6 cylinder FSI engine, the A/C compressor may be dismantled and removed from the mount only when the refrigerant circuit is open. The A/C compressor can be removed from the bracket only when the refrigerant circuit has been evacuated on an 8 cylinder FSI engine. Refer to «A/C COMPRESSOR»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__ac-compressor) . At start of production, A/C compressors manufactured by "Denso" (type "6 SEU 14") on 4 and 6 cylinder engines and type "7 SEU 17" on vehicles with 8 cylinders FSI engine) installed. Compressors from other manufacturers may also be installed at a later time. Refer to «Specifications»(/audi/a5/i-2007-2011/remont/general-servicing-all-makes/#general-technical-data-refrigerant-r134a-servicing-coupe-1-of-2) . Depending on time period of production and on engine, compressor construction type may vary. These A/C compressors are available as replacement parts with different oil fill capacities. Therefore, note the capacity on the A/C compressor and the exact part number. Refer to «Specifications»(/audi/a5/i-2007-2011/remont/general-servicing-all-makes/#general-technical-data-refrigerant-r134a-servicing-coupe-1-of-2) . Depending on A/C compressor type, different refrigerant oil fill capacities may be designated for the refrigerant circuit. The reason for the different oil capacities in the A/C compressor for an otherwise identical refrigerant circuit is the design of the compressor. Observe these oil capacities. Too much oil in the refrigerant circuit increases the pressures and reduces the cooling output of the A/C system. Too little oil can result in lubrication problems in the A/C compressor. Refer to «Specifications»(/audi/a5/i-2007-2011/remont/general-servicing-all-makes/#general-technical-data-refrigerant-r134a-servicing-coupe-1-of-2) . When installing the refrigerant lines and the corresponding brackets, make sure there is adequate distance between the belt, bracket and belt pulley. An A/C compressor with an A/C clutch -N25- is installed as a running change on certain 4 cylinder vehicles from MY 12. The A/C clutch turns off the A/C compressor drive completely under certain conditions (for example "ECON"). The correct Climatronic control module -J255- must be installed and it must be coded correctly so that the Climatronic control module display and control unit can control the A/C clutch -N25-. Refer to Vehicle Diagnostic Tester under "Guided Fault Finding". If a new compressor has been installed or new refrigerant oil has been put into the A/C compressor (for example after blowing through the A/C system), the A/C compressor must be turned by hand approximately 10 turns. This ensures that the compressor is not damaged when activated.
3. Belt Pulley/ A/C Compressor Drive Unit / A/C Clutch Belt Pulley -N25- A/C compressor belt pulley, removing and installing applies to 4- and 6 cylinder vehicles 1) . Refer to «A/C COMPRESSOR BELT PULLEY»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__ac-compressor-belt-pulley) . Ribbed belt, removing and installing applies to 4- and 6 cylinder engines 1) . Refer to «[For engine(s) CAUA] Removal and Installation»(ref-520122-S20318272142012123100000) or to «[For engine(s) CAEB] Removal and Installation»(ref-520126-S07155360692012123100000) or to «[For engine(s) CALA] Removal and Installation»(/audi/a5/i-2007-2011/remont/cooling-fan/#32l-cooling-system-engine-codes-cala-coupe-as-of-122008__removal-and-installation) . Ribbed belt allocation (vehicles with 4- and 6 cylinder engine), A/C Compressor drive, removing and installing, 8 Cylinder FSI Engine, refer to «A/C COMPRESSOR DRIVE UNIT OVERVIEW»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__ac-compressor-drive-unit-overview) (A/C compressor, removing, refer to RS «A/C COMPRESSOR»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__ac-compressor-engine-codes-caua) or RS5 «A/C COMPRESSOR»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__ac-compressor-engine-codes-cfsa) ). A/C Clutch -N25- belt pulley, replacing. applies to certain 4 cylinder engines from MY 12 1) . Refer to «BELT PULLEY WITH A/C CLUTCH -N25- OVERVIEW»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__belt-pulley-with-ac-clutch-n25) . NOTE: There is an overload protection installed between the belt pulley and the A/C compressor input shaft to protect the belt should the A/C compressor get blocked or be difficult to move. If the A/C compressor is run with resistance, the overload safeguard interrupts the supply of power to it. Rubber elements are installed between belt pulley/drive unit and the A/C compressor driveshaft, vibrations which may occur during A/C compressor operation may be dissipated via these rubber elements (damper function at torque fluctuations). Different versions of the pulley are installed depending on the type of A/C compressor and engine, refer to «A/C COMPRESSOR BELT PULLEY»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__ac-compressor-belt-pulley) . An A/C compressor with an A/C clutch -N25- is installed as a running change on certain 4 cylinder vehicles from MY 12. The A/C clutch turns off the A/C compressor drive completely under certain conditions (for example "ECON"). The correct Climatronic control module -J255- must be installed and it must be coded correctly so that the Climatronic control module display and control unit can control the A/C clutch -N25-. Refer to the Vehicle Diagnostic Tester under "Guided Fault Finding".
4. Oil Drain Plug "Denso" A/C compressors have sealing ring installed, always replace. "Denso" compressor tightening torque 30 Nm. May only be removed to drain refrigerant oil with A/C compressor removed, (rotate the A/C compressor via belt pulley to accelerate refrigerant oil flowing out). Refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#general-technical-data-refrigerant-r134a-servicing-coupe-2-of-2) .
5. Pressure Relief Valve Do not remove Tightening specification for the " Denso" A/C compressor: 10 Nm With O-ring "Denso" A/C compressor 8.5 mm x 1.75 mm, refer to «REFRIGERANT CIRCUIT O-RINGS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__refrigerant-circuit-o-rings) .
6. Connection With Valve For removing and installing the valve set when the refrigerant circuit is evacuated, for example, use an adapter from the socket for A/C valves T10364. WARNING: The valve insert may be removed only when the refrigerant circuit is empty.
7. A/C Pressure/Temperature Sensor -G395- 1) Removing and installing, refer to «A/C PRESSURE/TEMPERATURE SENSOR -G395»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__ac-pressuretemperature-sensor-g395) . Check the signal using the Vehicle Diagnostic Tester in "Guided Fault Finding" function. NOTE: The A/C pressure/temperature sensor exchanges information with the vehicle electrical system control module -J519- via a local Data bus. The vehicle electrical system control module transmits the data via the Data bus to the Climatronic control module -J255- display and control head. A high pressure sensor -G65- cannot be installed on this vehicle (it only delivers square-wave signals). The temperature measured by the A/C pressure/temperature sensor differs from the actual refrigerant temperature in the refrigerant circuit because of the A/C pressure/temperature sensor design and its component location. Because of this, it is not currently evaluated and is not used to regulate the A/C system.
8. Condenser Refrigerant lines, disconnecting and reconnecting, refer to «REFRIGERANT CIRCUIT COMPONENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) . Condenser, removing and installing, refer to «REFRIGERANT CIRCUIT COMPONENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) . Different versions. NOTE: It may be necessary to evacuate the refrigerant circuit and remove the refrigerant pipes from the condenser in order to remove the condenser from the front end or to remove the radiator depending on the version of the radiator and the condenser (for example, on the Audi RS 4 and the Audi RS 5). Refer to «REFRIGERANT CIRCUIT COMPONENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) .
9. Fluid Reservoir The receiver is mounted directly on the condenser. Refer tp «FLUID RESERVOIR»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__fluid-reservoir) . Removing and installing, refer to «FLUID RESERVOIR»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__fluid-reservoir) . Different versions. NOTE: The reservoir may be attached to or integrated in the condenser, depending on the version of the condenser. Refer to «FLUID RESERVOIR»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__fluid-reservoir) and «REFRIGERANT CIRCUIT COMPONENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) . Dryer cartridge (on a condenser with an integrated fluid reservoir), removing and installing, refer to «REFRIGERANT CIRCUIT COMPONENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) .
10. Refrigerant Line Quick-Release Coupling - High Pressure Side WARNING: The quick acting coupling connectors may be unlocked and opened only if the refrigerant circuit is empty. Disconnecting and connect the refrigerant lines from the quick acting coupling connectors, refer to «REFRIGERANT LINES DISCONNECTING FROM QUICK-RELEASE COUPLINGS AND CONNECTING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__refrigerant-lines-disconnecting-from-quick-release-couplings) . Replace the quick-release coupling completely with the O-ring and support ring. Refer to «REFRIGERANT LINES DISCONNECTING FROM QUICK-RELEASE COUPLINGS AND CONNECTING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__refrigerant-lines-disconnecting-from-quick-release-couplings) , NOTE: The Audi RS 4 and on the Audi RS 5 has a block connector instead of quick-release connector. Removing and installing the block connector is same as removing and installing the block connector on the condenser. Refer to «REFRIGERANT CIRCUIT COMPONENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) .
11. Sealing Cap With a seal Always screw on
12. High Pressure Side Service Connection Different versions (with primary sealing valve or with Schrader valve) depending on refrigerant line, distinguishing characteristics, refer to «Description and Operation»(/audi/a5/i-2007-2011/remont/general-servicing-all-makes/#general-technical-data-refrigerant-r134a-servicing-coupe-1-of-2) . For removing and installing the service connection or the valve set when the refrigerant circuit is evacuated, for example, use an adapter from the socket for A/C valves T10364. For the A/C service station to measure pressures, to discharge and recharge the refrigerant circuit. Refer to «Description and Operation»(/audi/a5/i-2007-2011/remont/general-servicing-all-makes/#general-technical-data-refrigerant-r134a-servicing-coupe-1-of-2) . Depending on engine version, it may be necessary to remove some components in order to be able to connect to service coupling of the service station. WARNING: Only remove service connections when the refrigerant circuit is empty. The connection does not have a valve. NOTE: Depending on the allocation of the service connection an on the refrigerant line, and on the version of the vehicle, it may be necessary to remove the additional reinforcement on the left suspension strut dome so that the service coupling of the service station can be connected (for example, on the Audi Q5). Refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/suspension-front/#front-suspension-coupe) and «Removal and Installation»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#general-technical-data-refrigerant-r134a-servicing-coupe-2-of-2) . Depending on the version of the vehicle, Service connections may be connected to the connected refrigerant pipe (for example, on the Audi RS 4 and Audi RS 5) instead of to the refrigerant pipe with an inner heat exchanger. It may be necessary on the Audi RS 4 and the Audi RS 5 to carefully lift the refrigerant pipe and then push it slightly to the side in order to connect the Service coupling.
13. Refrigerant Pipe With Inner Heat Exchanger In this refrigerant line, liquid warm refrigerant from the high pressure side is released into the low pressure side as flowing vaporous refrigerant energy. This increases the cooing efficiency of the A/C system. Removing and installing, refer to «REFRIGERANT CIRCUIT COMPONENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) .
14. Expansion Valve Refrigerant lines with inner heat exchanger, disconnecting and reconnecting, refer to «REFRIGERANT CIRCUIT COMPONENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) . Removing and installing, refer to «EXPANSION VALVE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__expansion-valve) . NOTE: After switching off the A/C compressor in this vehicle, it may take a relatively long time for the pressure on the high pressure side to decrease. This is because the expansion valve is cold and the pressure on the low pressure side increases quickly after shutting the compressor off, then the expansion valve closes and the refrigerant flows slowly to the low pressure side. If the A/C compressor is switched on, the pressure on the low pressure side goes down, the expansion valve open and the refrigerant can flow of the low pressure side. From the start of production through the change-over from MY 12, evaporators approximately 40 mm (1.6 in.) wide (block depth) are being installed (air conditioner part number "8K_ 820 005"). From MY 12, as a running change and depending on the version of the vehicle, an approximately 50 mm (2 in.) wide evaporator (block depth) is being installed (air conditioner part number "8T_ 820 005"). Pay attention to the correct allocation of the evaporator expansion valve (there are different versions).
15. Evaporator A/C unit (with evaporator) removing and installing, refer to «A/C UNIT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__ac-unit) . Evaporator with the A/C installed, removing and installing, refer to «EVAPORATOR, A/C UNIT INSTALLED»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__evaporator-ac-unit-installed) . NOTE: From the start of production through the change-over from MY 12, evaporators approximately 40 mm (1.6 in.) wide (block depth) are being installed (air conditioner part number "8K_ 820 005"). From MY 12, as a running change and depending on the version of the vehicle, an approximately 50 mm (2 in.) wide evaporator (block depth) is being installed (air conditioner part number "8T_ 820 005"). Pay attention to the correct allocation of the evaporator expansion valve (there are different versions).
16. Refrigerant Line Quick Acting Coupling - Low Pressure Side WARNING: The quick acting coupling connectors may be unlocked and opened only if the refrigerant circuit is empty. Disconnecting and connect the refrigerant lines from the quick acting coupling connectors, refer to «REFRIGERANT LINES DISCONNECTING FROM QUICK-RELEASE COUPLINGS AND CONNECTING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__refrigerant-lines-disconnecting-from-quick-release-couplings) . Replace the quick-release coupling completely with the O-ring and support ring. Refer to «REFRIGERANT LINES DISCONNECTING FROM QUICK-RELEASE COUPLINGS AND CONNECTING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__refrigerant-lines-disconnecting-from-quick-release-couplings)
17. Sealing Cap With a seal Always screw on
18. Low Pressure Side Service Connection Different versions (with primary sealing valve or with Schrader valve) depending on refrigerant line, distinguishing characteristics, refer to «Description and Operation»(/audi/a5/i-2007-2011/remont/general-servicing-all-makes/#general-technical-data-refrigerant-r134a-servicing-coupe-1-of-2) . For removing and installing the service connection or the valve set when the refrigerant circuit is evacuated, for example, use an adapter from the socket for A/C valves T10364. For the A/C service station to measure pressures and to discharge the refrigerant circuit, refer to «Description and Operation»(/audi/a5/i-2007-2011/remont/general-servicing-all-makes/#general-technical-data-refrigerant-r134a-servicing-coupe-1-of-2) . Depending on engine version, it may be necessary to remove some components in order to be able to connect to service coupling of the service station. WARNING: Only remove service connections when the refrigerant circuit is empty. The connection does not have a valve. NOTE: Depending on the allocation of the service connection an on the refrigerant line, and on the version of the vehicle, it may be necessary to remove the additional reinforcement on the left suspension strut dome so that the service coupling of the service station can be connected (for example, on the Audi Q5). Refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/suspension-front/#front-suspension-coupe) and «Removal and Installation»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#general-technical-data-refrigerant-r134a-servicing-coupe-2-of-2) . Depending on the version of the vehicle, Service connections may be connected to the connected refrigerant pipe (for example, on the Audi RS 4 and Audi RS 5) instead of to the refrigerant pipe with an inner heat exchanger.

REFRIGERANT CIRCUIT COMPONENT OVERVIEW - ENGINE CODE(S): CHJA

Hybrid vehicles

Read and follow all of the supplemental warnings for all work performed on vehicles with the high voltage system. Refer to HIGH VOLTAGE SYSTEM (HYBRID VEHICLES) REPAIRS .

HD = High-pressure end

ND = Low-pressure end

Arrows point in direction of refrigerant flow.

The parts identified with 1) can be serviced or replaced by any workshop. The work procedures identified with 1) can be performed by any workshop. These components and work procedures do not affect the refrigerant circuit.

Refrigerant circuit components not identified with 1) cannot be serviced or replaced by all workshops. This also applies to all refrigerant hoses and refrigerant lines. Components not identified with 1) can only be serviced or replaced by a workshop that has all the necessary equipment and tools. In these workshops only trained technicians may perform this work. The refrigerant circuit must be drained. Refer to Description and Operation .

Scheme 279

1. A/C Compressor Driven By Electricity With A/C compressor control module -J842- and electric A/C compressor -V470- Removing the A/C compressor from the bracket and re-installing in vehicles with a 4 cylinder engine, refer to «ELECTRIC A/C COMPRESSOR REMOVING FROM BRACKET»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__electric-ac-compressor-removing-from-bracket) 1) A/C compressor refrigerant line, disconnecting and reconnecting, refer to «A/C COMPRESSOR REFRIGERANT LINES»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__ac-compressor-refrigerant-lines) A/C compressor, removing and installing, refer to «ELECTRIC A/C COMPRESSOR»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__electric-ac-compressor) . NOTE: Depending on time period of production and on engine, compressor construction type may vary. These A/C compressors are available as replacement parts with different oil fill capacities. Therefore, note the capacity on the A/C compressor and the exact part number. Refer to «Specifications»(/audi/a5/i-2007-2011/remont/general-servicing-all-makes/#general-technical-data-refrigerant-r134a-servicing-coupe-1-of-2) . Depending on A/C compressor type, different refrigerant oil fill capacities may be designated for the refrigerant circuit. The reason for the different oil capacities in the A/C compressor for an otherwise identical refrigerant circuit is the design of the compressor. Observe these oil capacities. Too much oil in the refrigerant circuit increases the pressures and reduces the cooling output of the A/C system. Too little oil can result in lubrication problems in the A/C compressor. Refer to «Description and Operation»(/audi/a5/i-2007-2011/remont/general-servicing-all-makes/#general-technical-data-refrigerant-r134a-servicing-coupe-1-of-2) . When installing refrigerant pipes and the corresponding bracket, make sure there is adequate distance between the other components (such as the belt, belt pulley for the engine, etc.). After the installation of the electrically driven A/C compressor and the subsequent filling of the refrigerant circuit, start up the A/C compressor for the first time using the "compressor intake" function for the basic setting. The A/C compressor may otherwise become damaged if before installation, refrigerant oil was improperly stored in the A/C compressor compression chamber. Refer to the Vehicle Diagnostic Tester in the "Guided Fault Finding" Function for A/C System and Battery Regulator. Only activate the electrically driven A/C compressor when the refrigerant circuits is filled. If the A/C compressor is running while the refrigerant circuit is empty, the A/C compressor may become damaged. Refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#general-technical-data-refrigerant-r134a-servicing-coupe-2-of-2) and the Vehicle Diagnostic Tester in the "Guided Fault Finding" Function for A/C System and Battery Regulator.
2. Pressure Relief Valve Do not remove Tightening specification for the " Denso" A/C compressor: 10 Nm With O-ring "Denso" A/C compressor 8.5 mm x 1.75 mm, refer to «REFRIGERANT CIRCUIT O-RINGS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__refrigerant-circuit-o-rings) .
3. Connection With Valve For removing and installing the valve set when the refrigerant circuit is evacuated, for example, use an adapter from the socket for A/C valves T10364. WARNING: The valve insert may be removed only when the refrigerant circuit is empty.
4. A/C Pressure/Temperature Sensor -G395- 1) Removing and installing, refer to «A/C PRESSURE/TEMPERATURE SENSOR -G395»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__ac-pressuretemperature-sensor-g395) . Check the signal using the Vehicle diagnostic tester in the "Guided Fault Finding" function. NOTE: The A/C pressure/temperature sensor exchanges information with the vehicle electrical system control module -J519- via a local Data bus. The vehicle electrical system control module transmits the data via the Data bus to the Climatronic control module -J255- display and control head. A high pressure sensor -G65- cannot be installed on this vehicle (it only delivers square-wave signals). The temperature measured by the A/C pressure/temperature sensor differs from the actual refrigerant temperature in the refrigerant circuit because of the A/C pressure/temperature sensor design and its component location. Because of this, it is not currently evaluated and is not used to regulate the A/C system.
5. Condenser Refrigerant lines, disconnecting and reconnecting, refer to «REFRIGERANT CIRCUIT COMPONENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) . Condenser, removing and installing; refer to «REFRIGERANT CIRCUIT COMPONENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) . Different versions. NOTE: To remove the condenser from the front end or to remove the radiator, it may be necessary to drain the refrigerant circuit and to remove the refrigerant pipe from the condenser, depending on the version of the radiator and of the condenser. Refer to «REFRIGERANT CIRCUIT COMPONENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) .
6. Fluid Reservoir The receiver is mounted directly on the condenser. Refer to «FLUID RESERVOIR»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__fluid-reservoir) . Removing and installing, refer to «FLUID RESERVOIR»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__fluid-reservoir) . Different versions. NOTE: The reservoir may be attached to or integrated in the condenser, depending on the version of the condenser. Refer to «FLUID RESERVOIR»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__fluid-reservoir) and «DRYER CARTRIDGE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__dryer-cartridge) . Dryer cartridge (on a condenser with an integrated fluid reservoir), removing and installing, refer to «REFRIGERANT CIRCUIT COMPONENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) .
7. Cap With a seal Always screw on
8. High Pressure Side Service Connection Different versions (with primary sealing valve or with Schrader valve) depending on refrigerant line, distinguishing characteristics. Refer to «Description and Operation»(/audi/a5/i-2007-2011/remont/general-servicing-all-makes/#general-technical-data-refrigerant-r134a-servicing-coupe-1-of-2) For the A/C service station to measure pressures, to discharge and recharge the refrigerant circuit. Refer to «Description and Operation»(/audi/a5/i-2007-2011/remont/general-servicing-all-makes/#general-technical-data-refrigerant-r134a-servicing-coupe-1-of-2) . Depending on engine version, it may be necessary to remove some components in order to be able to connect to service coupling of the service station. WARNING: Only remove service connections when the refrigerant circuit is empty. The connection does not have a valve. NOTE: Depending on the allocation of the service connection an on the refrigerant line, and on the version of the vehicle, it may be necessary to remove the additional reinforcement on the left suspension strut dome so that the service coupling of the service station can be connected. Refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/suspension-front/#front-suspension-coupe) and «Removal and Installation»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#general-technical-data-refrigerant-r134a-servicing-coupe-2-of-2) .
9. Connection For The Evaporator In The Battery Cooling Module High pressure side Refrigerant pipes to battery cooling module on underbody, removing and installing, refer to «REFRIGERANT LINES TO BATTERY COOLING MODULE OVERVIEW»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__refrigerant-lines-to-battery-cooling-module) . Pass-Through Refrigerant Lines in Luggage Compartment, Removing and Installing, refer to «PASS-THROUGH REFRIGERANT LINES IN LUGGAGE COMPARTMENT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__pass-through-refrigerant-lines-in-luggage-compartment) . WARNING: The bolts of the connection point may only be loosened when the refrigerant circuit has been discharged.
10. Expansion Valve With Hybrid Battery Refrigerant Shut-Off Valve 2 -N517- Attached to the evaporator in the battery cooling module. Expansion valve with Hybrid Battery Refrigerant Shut-Off Valve 2 -N517-, removing and installing, refer to «EXPANSION VALVE WITH HYBRID BATTERY REFRIGERANT SHUT-OFF VALVE 2 -N517»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__expansion-valve-with-hybrid-battery-refrigerant) . Pass-through refrigerant lines in luggage compartment, removing and installing, refer to «PASS-THROUGH REFRIGERANT LINES IN LUGGAGE COMPARTMENT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__pass-through-refrigerant-lines-in-luggage-compartment) . NOTE: The -N517- is activated, if it is necessary to cool the battery (closed without activation).
11. Evaporator In The Battery Cooling Module Battery cooling module component. Refrigerant lines for battery cooling module in luggage compartment, removing and installing, refer to «REFRIGERANT LINES FOR BATTERY COOLING MODULE IN LUGGAGE COMPARTMENT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__refrigerant-lines-for-battery-cooling-module) . Battery cooling module, removing and installing, refer to «BATTERY COOLING MODULE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__battery-cooling-module) . Battery cooling module attachments, removing, refer to «BATTERY COOLING MODULE OVERVIEW»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__battery-cooling-module-overview) . Battery cooling module moving into service position, refer to «BATTERY COOLING MODULE, SERVICE POSITION»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__battery-cooling-module-service-position) . Refrigerant lines overview, refer to «REFRIGERANT LINES TO BATTERY COOLING MODULE OVERVIEW»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__refrigerant-lines-to-battery-cooling-module) .
12. Hybrid Battery Refrigerant Shut-Off Valve 1 -N516- Installed inside the engine compartment near the left suspension strut tower. Removing and installing, refer to «HYBRID BATTERY REFRIGERANT SHUT-OFF VALVE 1 -N516»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__hybrid-battery-refrigerant-shut-off-valve-1) . NOTE: The Hybrid Battery Refrigerant Shut-Off Valve 1 is for example activated, if the battery needs to be cooled and the vehicle interior is not already being cooled (open without activation). Union nut tightening specification, refer to «HYBRID BATTERY REFRIGERANT SHUT-OFF VALVE 1 -N516»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__hybrid-battery-refrigerant-shut-off-valve-1) .
13. Refrigerant Line Quick-Release Coupling - High Pressure Side WARNING: The quick acting coupling connectors may be unlocked and opened only if the refrigerant circuit is empty. Disconnecting and connect the refrigerant lines from the quick acting coupling connectors, refer to «REFRIGERANT LINES DISCONNECTING FROM QUICK-RELEASE COUPLINGS AND CONNECTING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__refrigerant-lines-disconnecting-from-quick-release-couplings) . Replace the quick-release coupling completely with the O-ring and support ring. Refer to «REFRIGERANT LINES DISCONNECTING FROM QUICK-RELEASE COUPLINGS AND CONNECTING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__refrigerant-lines-disconnecting-from-quick-release-couplings)
14. Refrigerant Pipe With Inner Heat Exchanger In this refrigerant pipe, the flowing fluid warm refrigerant on the high pressure side is delivered into the low pressure side as flowing, vapor, cold refrigerant to increase the efficiency of the A/C system. Removing and installing, refer to «REFRIGERANT PIPE WITH INNER HEAT EXCHANGER»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__refrigerant-pipe-with-inner-heat-exchanger) .
15. Expansion Valve For the evaporator in the A/C system. Refrigerant lines with inner heat exchanger, disconnecting and reconnecting, refer to «REFRIGERANT PIPE WITH INNER HEAT EXCHANGER»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__refrigerant-pipe-with-inner-heat-exchanger) . Removing and installing, refer to «EXPANSION VALVE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__expansion-valve) . NOTE: After switching off the A/C compressor in this vehicle, it may take a relatively long time for the pressure on the high pressure side to decrease. This is because the expansion valve is cold and the pressure on the low pressure side increases quickly after shutting the compressor off, then the expansion valve closes and the refrigerant flows slowly to the low pressure side. If the A/C compressor is switched on, the pressure on the low pressure side goes down, the expansion valve open and the refrigerant can flow of the low pressure side. From the start of production through the change-over from MY 12, evaporators approximately 40 mm (1.6 in.) wide (block depth) are being installed (air conditioner part number "8K_ 820 005"). From MY 12, as a running change and depending on the version of the vehicle, an approximately 50 mm (2 in.) wide evaporator (block depth) is being installed (air conditioner part number "8T_ 820 005"). Pay attention to the correct allocation of the evaporator expansion valve (there are different versions).
16. Evaporator in the A/C System A/C unit (with evaporator) removing and installing, refer to «A/C UNIT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__ac-unit) . Evaporator with the A/C installed, removing and installing, refer to «EVAPORATOR, A/C UNIT INSTALLED»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__evaporator-ac-unit-installed) . NOTE: From the start of production through the change-over from MY 12, evaporators approximately 40 mm (1.6 in.) wide (block depth) are being installed (air conditioner part number "8K_ 820 005"). From MY 12, as a running change and depending on the version of the vehicle, an approximately 50 mm (2 in.) wide evaporator (block depth) is being installed (air conditioner part number "8T_ 820 005"). Pay attention to the correct allocation of the evaporator expansion valve (there are different versions).
17. Refrigerant Line Quick Acting Coupling - Low Pressure Side WARNING: The quick acting coupling connectors may be unlocked and opened only if the refrigerant circuit is empty. Disconnecting and connect the refrigerant lines from the quick acting coupling connectors, refer to «REFRIGERANT LINES DISCONNECTING FROM QUICK-RELEASE COUPLINGS AND CONNECTING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__refrigerant-lines-disconnecting-from-quick-release-couplings) . Replace the quick-release coupling completely with the O-ring and support ring. Refer to «REFRIGERANT LINES DISCONNECTING FROM QUICK-RELEASE COUPLINGS AND CONNECTING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__refrigerant-lines-disconnecting-from-quick-release-couplings)
18. Connection For The Evaporator In The Battery Cooling Module Low pressure side WARNING: The bolts of the connection point may only be loosened when the refrigerant circuit has been discharged.
19. Sealing Cap With a seal Always screw on
20. Low Pressure Side Service Connection Different versions (with primary sealing valve or with Schrader valve) depending on refrigerant line, distinguishing characteristics. Refer to «Description and Operation»(/audi/a5/i-2007-2011/remont/general-servicing-all-makes/#general-technical-data-refrigerant-r134a-servicing-coupe-1-of-2) . For removing and installing the service connection or the valve set when the refrigerant circuit is evacuated, for example, use an adapter from the socket for A/C valves T10364. For the A/C service station to measure pressures and to discharge the refrigerant circuit. Refer to «Description and Operation»(/audi/a5/i-2007-2011/remont/general-servicing-all-makes/#general-technical-data-refrigerant-r134a-servicing-coupe-1-of-2) . Depending on engine version, it may be necessary to remove some components in order to be able to connect to service coupling of the service station. WARNING: Only remove service connections when the refrigerant circuit is empty. The connection does not have a valve. NOTE: Depending on the allocation of the service connection an on the refrigerant line, and on the version of the vehicle, it may be necessary to remove the additional reinforcement on the left suspension strut dome so that the service coupling of the service station can be connected. Refer to «Removal and Installation»(/audi/a5/i-2007-2011/remont/suspension-front/#front-suspension-coupe) and «Removal and Installation»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#general-technical-data-refrigerant-r134a-servicing-coupe-2-of-2) . Depending on the vehicle version, service connections can also be connected to the connected refrigerant pipe instead of the refrigerant pipe with an inner heat exchanger.

REFRIGERANT LINES TO BATTERY COOLING MODULE OVERVIEW

With high voltage systems (hybrid vehicles)

Scheme 280

1. High Pressure Side Refrigerant Pipe Inside the engine compartment
2. O-Ring
3. Low Pressure Side Refrigerant Pipe In the front on the floor panel Removing and installing, refer to «FRONT REFRIGERANT LINES TO BATTERY COOLING MODULE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__front-refrigerant-lines-to-battery-cooling) .
4. Screw M8 thread 25 Nm M6 thread 9 Nm
5. O-Ring
6. High Pressure Side Refrigerant Pipe In the front on the floor panel Removing and installing, refer to «FRONT REFRIGERANT LINES TO BATTERY COOLING MODULE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__front-refrigerant-lines-to-battery-cooling) .
7. Screw M8 thread 25 Nm M6 thread 9 Nm
8. High Pressure Side Refrigerant Pipe In the rear on the floor panel Removing and installing, refer to «REAR REFRIGERANT LINES TO BATTERY COOLING MODULE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__rear-refrigerant-lines-to-battery-cooling) .
9. O-Ring Seals
10. Low Pressure Side Refrigerant Pipe In the rear on the floor panel Removing and installing, refer to «REAR REFRIGERANT LINES TO BATTERY COOLING MODULE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__rear-refrigerant-lines-to-battery-cooling) .
11. Screw M8 thread 25 Nm M6 thread 9 Nm
12. Screws M8 thread 25 Nm M6 thread 9 Nm
13. O-Ring Seals
14. Pass-Through For The Refrigerant Lines In The Luggage Compartment Removing and Installing, refer to «PASS-THROUGH REFRIGERANT LINES IN LUGGAGE COMPARTMENT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__pass-through-refrigerant-lines-in-luggage-compartment) .
15. O-Ring Seals
16. Screws M8 thread 25 Nm M6 thread 9 Nm
17. Nut Tightening specification 9 Nm
18. High Pressure Refrigerant Line To the battery cooling module inside the luggage compartment Removing and installing, refer to «REFRIGERANT LINES FOR BATTERY COOLING MODULE IN LUGGAGE COMPARTMENT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__refrigerant-lines-for-battery-cooling-module) .
19. Low Pressure Side Refrigerant Pipe To the battery cooling module inside the luggage compartment. Removing and installing, refer to «REFRIGERANT LINES FOR BATTERY COOLING MODULE IN LUGGAGE COMPARTMENT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__refrigerant-lines-for-battery-cooling-module) .
20. Screw Tightening specification: 9 Nm (screws with an M6 thread) and 25 Nm (screws with an M8 thread).
21. O-Ring Seals
22. Screw M8 thread 25 Nm M6 thread 9 Nm
23. Sheet Metal Nut Tightening specification 2.5 Nm
24. Screw M8 thread 25 Nm M6 thread 9 Nm
25. Hybrid Battery Refrigerant Shut-Off Valve 1 -N516- Removing and Installing, refer to «HYBRID BATTERY REFRIGERANT SHUT-OFF VALVE 1 -N516»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__hybrid-battery-refrigerant-shut-off-valve-1) . NOTE: Hybrid battery refrigerant shut-off valve 1 is installed in the high pressure side refrigerant pipe, item 1 «REFRIGERANT LINES TO BATTERY COOLING MODULE OVERVIEW»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__refrigerant-lines-to-battery-cooling-module) and «HYBRID BATTERY REFRIGERANT SHUT-OFF VALVE 1 -N516»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__hybrid-battery-refrigerant-shut-off-valve-1) (it does not have a number in this illustration).

FASTENER TIGHTENING SPECIFICATIONS

GENERAL INFORMATION

Special tools and workshop equipment required

1. Vehicle Diagnostic Tester and the connection cable.
2. A standard thermometer (for temperature measurements, if necessary a thermometer with 2 measuring probes for simultaneous measurement such as for temperature on the right and left)

Only for vehicles with mechanically driven A/C compressor and not for vehicles with a high voltage electrical system (hybrid vehicles)

1. A/C cooling output, testing requirements, refer to «A/C COOLING OUTPUT, TESTING REQUIREMENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__ac-cooling-output-testing-requirements) .
2. Check cooling performance, refer to «COOLING OUTPUT, CHECKING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__cooling-output-checking) .

Note. From MY 2010, these vehicles may have a Start/Stop System for specific engines as optional equipment. The setting on the Climatronic control module -J255- can prevent the Stop function. If, for example, "defrost" is selected, the stop function is not possible or will be interrupted and the engine will start. The same applies in the case of heating and cooling. The difference between the selected and actual temperature is greater than a specified value checked with the Vehicle Diagnostic Tester in "Guided Fault Finding". Vehicles with the Start/Stop System have an additional coolant recirculation pump -V50- (water pump -V36-) for the stop function, refer to COOLANT PUMP ; and to [For engine(s) CAUA] Description and Operation or to [For engine(s) CAEB] Description and Operation or to [For engine(s) CALA] Description and Operation and the Vehicle Diagnostic Tester in "Guided Fault Finding". The coolant pump (water pump) is controlled not only when the "Start/Stop System" is on, but also when the engine is running and when the temperature is set to "warm" on the Climatronic control module ("HI" appears in the display on the A/C control head and in the MMI). The coolant pump (water pump is activated to support the engine coolant pump. Check using the Vehicle Diagnostic Tester in "Guided Fault Finding". The coolant pump (water pump) versions and activation differ depending on the version of the vehicle and production period. From MY 12 beginning with start of production, pumps that were controlled by a 500 Hertz signal (500 pulses per second) are being replaced by pumps that are controlled by a 100 Hertz signal depending on the engine. Pumps, controlled by a 100 Hertz signal, also have a diagnostic function and are controlled by the engine control module. Check for the correct allocation; refer to the Vehicle Diagnostic Tester in "Guided Fault Finding", to the appropriate SYSTEM WIRING DIAGRAM. From MY 12 (introduction depending on the version of the vehicle), a revised fresh air blower control module -J126- (and fresh air blower -V2-, Climatronic control module, evaporator, expansion valves, motors and A/C are being used. Refer to the Vehicle Diagnostic Tester in "Guided Fault Finding". Read all the information regarding these components. Refer to A/C UNIT AND AIR INTAKE HOUSING OVERVIEW, BASIS A/C SYSTEM . From the start of production through the change-over from MY 12, evaporators approximately 40 mm (1.6 in.) wide (block depth) are being installed (air conditioner part number "8K_ 820 005"). From MY 12, as a running change and depending on the version of the vehicle, an approximately 50 mm (2 in.) wide evaporator (block depth) is being installed (air conditioner part number "8T_ 820 005"). Pay attention to the correct allocation of the evaporator expansion valve (there are different versions).

A/C COOLING OUTPUT, TESTING REQUIREMENTS

Only for vehicles with mechanically driven A/C compressor and not for vehicles with a high voltage electrical system (hybrid vehicles)

1. Ambient temperature greater than 15 °C (59 °F).
2. Radiator and condenser are clean (if necessary clean)
3. The ribbed belt for A/C compressor drive is OK and correctly tensioned and the belt pulley actually drives the A/C compressor (on vehicles with a 4- or 6-cylinder engine). Refer to «A/C COMPRESSOR BELT PULLEY»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__ac-compressor-belt-pulley) .
4. The A/C compressor ribbed belt is OK and is tensioned correctly, the Climatronic control module -J255- is activating the A/C clutch -N25- and the belt pulley is driving the A/C compressor (only on certain vehicles with an A/C compressor with a magnetic clutch, introduction from MY 12, for example, on vehicles with a certain 4 cylinder engines). Refer to «BELT PULLEY WITH A/C CLUTCH -N25- OVERVIEW»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__belt-pulley-with-ac-clutch-n25) and the Vehicle diagnostic tester in "Guided Fault Finding".
5. The A/C compressor drive unit is mounted correctly and the A/C compressor is actually driven (on 8 cylinder vehicles), refer to «A/C COMPRESSOR DRIVE UNIT OVERVIEW»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__ac-compressor-drive-unit-overview) .
6. All air ducts, covers and seals OK and properly installed
7. Air flow through dust and pollen filter not obstructed by dirt. Refer to «DUST AND POLLEN FILTER»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__dust-and-pollen-filter) .
8. Air intake apparatus (in fresh air and recirculating air mode) is not impaired by soiling or components installed as retrofit.
9. Vehicle not exposed to sunlight
10. The engine is warm (the coolant temperature is higher than 80 °C (176 °F)).
11. Climatronic control module DTC memory was checked and erased, basic setting was performed and the Climatronic control module coding was checked using the Vehicle diagnostic tester in "Guided Fault Finding"
12. The Climatronic control module adaptation was checked using the Vehicle diagnostic tester in "Guided Fault Finding".
13. All instrument panel vents open
14. The hood is closed.
15. The engine is running.

Set the "Basis" Climatronic control module display and control head as follows

1. "Auto" operating mode (indicator light on the AUTO button lights up).
2. Temperature preselect "cold" (display "LO" in the MMI display).
3. The A/C compressor is on (the indicator lamp on the AC button comes on).
4. Preselect for the fresh air blower "maximum speed" (in the Multi Media Interface display, level "10" or greater).

The Climatronic control module of "Comfort" version is set as follows

1. "Auto" mode (the indicator lamp in both AUTO buttons illuminate).
2. Temperature preselect "cold" for the driver's and passenger's side (display "LO" for the driver's and passenger's side in the A/C Control Head display and in the Multi Media Interface display).
3. The A/C compressor is on (the indicator lamp on the AC button comes on).
4. Preselect for the fresh air blower "maximum speed" (display in the A/C Control Head and in the Multi Media Interface display, level "10" or greater).

Note. The indicator lamp in the AUTO button(s) goes out when the fresh air blower speed is changed manually. The maximum possible fresh air blower speed depends on several conditions (coolant temperature, vehicle voltage, etc.)

On vehicles equipped with the "Comfort" A/C system, the Rear Temperature Selection Potentiometer -G538- is set to "cold" (installed in the rear center console vent).

On vehicles equipped with the "Comfort" A/C system, the vent in the rear center console is open.

Functions with engine running

The coolant fans (coolant fan -V7- and coolant fan 2 -V177-) run (activation and speed depend on pressure in coolant circuit and engine temperature).

Note. Depending on the version of the Climatronic control module, the coolant fans (coolant fan -V7- and coolant fan 2 -V177-) are only switched on at a certain pressure in the coolant circuit (currently, at a pressure of approximately 9 bar (130.5 psi)). The coolant fan(s) control is displayed in the measured values block. Refer to the Vehicle diagnostic tester in "Guided Fault Finding".

The Fresh Air Blower -V2- runs with maximum speed ("10" or greater).

Note. The maximum possible fresh air blower speed depends on several conditions (coolant temperature, vehicle voltage, etc.)

The air conditioner goes in recirculation mode (approximately 1 minute after starting the engine, the back pressure/fresh air door is closed and the recirculation door is opened, Fresh Air Blower. extracts the air from passenger compartment below instrument panel / behind the glove compartment).

Note. If one of these requirements is not filled, check the DTC memory, perform output diagnostic test mode and read the measured values block using the Vehicle diagnostic tester in "Guided Fault Finding".

COOLING OUTPUT, CHECKING

Not for vehicles with a high voltage system (hybrid vehicles)

Only on vehicles with mechanically driven A/C compressors

1. The requirements for testing the cooling capacity are fulfilled. Refer to «A/C COOLING OUTPUT, TESTING REQUIREMENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__ac-cooling-output-testing-requirements) .

Measure the ambient temperature (must be warmer than 15 °C (59 °F)).

Close the doors, the engine hood, the windows, the sunroof and the rear lid.

Open all instrument panel vents.

Start the engine.

Switch off the A/C compressor (set the "Econ" mode on the Climatronic control module -J255- A/C display control head. The indicator lamp in the AC button does not illuminate).

Perform a Guided Fault Finding on the A/C system using the Vehicle diagnostic tester in "Guided Fault Finding".

In "read measured values block" select the display group with the measured values for the compressor control and refrigerant circuit pressure and read the measured values using the Vehicle diagnostic tester in "Guided Fault Finding" function.

1. The A/C compressor is switched off, a current of 0 A (amps) will be displayed.
2. The pressure in the refrigerant circuit is same as the measured outside temperature or greater than the value in the chart.

Note. At absolute pressure, 0 bar corresponds to absolute vacuum. Normal ambient pressure equals approximately 1 bar (14.5 psi) absolute pressure and 0 bar pressure. On the scales of most pressure gauges, 0 bar pressure corresponds to an absolute pressure of one bar (can be seen from -1 mark below 0). Depending on version of the Climatronic control module -J255-, only integer values may be displayed in the measured values block, if the pressure measured lies between two values the display switches back and forth. Pressure in refrigerant circuit is governed by ambient temperature. On account of heat given off by components (e.g. radiator), pressure displayed with warm engine will be slightly higher than that given for the respective ambient temperature. If pressure displayed is below that indicated in table. Check the signal coming from the A/C pressure/temperature sensor -G395- using the Vehicle diagnostic tester in "Guided Fault Finding". If no fault is determined at the A/C pressure/temperature sensor, there is insufficient coolant in the circuit. Bring vehicle to a workshop that has the necessary tools and in which the work can be performed accordingly by qualified personnel. Refer to General, Technical Data .

Refrigerant circuit pressure OK

Switch the A/C compressor on by selecting the "Auto" mode on the Climatronic control module (the indicator lamps in the AUTO buttons and the AC button illuminate).

Using the dial on the Climatronic control module, set the temperature preselect to "cold" (for the driver and passenger side).

On vehicles with the "Comfort" A/C system, set the rear temperature selection potentiometer -G538- to "cold" (installed in the rear center console vent).

Using the rotary switch on the Climatronic control module set the vent direction to "instrument panel vents" (for the driver's and passenger's side).

Note. The indicator lamp in the one or both AUTO buttons goes out when the vent direction for the air or fresh air blower speed is manually changed. The maximum possible fresh air blower speed depends on several conditions (coolant temperature, vehicle voltage, etc.)

In the "read measured values block", read the specified current which is controlled by the A/C compressor regulator valve -N280- (if the specified current is greater than 0.3 A, then the A/C compressor should be switched on) using the Vehicle diagnostic tester in "Guided Fault Finding".

Note. The current is calculated by the Climatronic control module, the request is sent via the Data bus on the Vehicle Electrical System Control Module -J519-. Check using the Vehicle diagnostic tester in "Guided Fault Finding".

In "read measured values block" read the actual current which is controlled by the A/C compressor regulator valve (if the actual current is greater than 0.3 A, then the compressor is switched on) using the Vehicle diagnostic tester in "Guided Fault Finding".

Note. If no or very little current is displayed in measured values block, check actuation of A/C compressor regulator valve. Refer to A/C COMPRESSOR REGULATOR VALVE -N280-, CHECKING SWITCH-ON SIGNAL . The Climatronic control module actuates the A/C compressor regulator valve via the vehicle electrical system control module. The actuation of the A/C compressor regulator valve is displayed in the vehicle electrical system control module measured values block using the Vehicle diagnostic tester in "Guided Fault Finding". The actual current, which flows through the A/C compressor regulator valve is measured by the vehicle electrical system control module and sent by the Climatronic control module. Check using the Vehicle diagnostic tester in "Guided Fault Finding".

In "read measured values block" read the refrigerant circuit pressure measured by the A/C pressure/temperature sensor -G395- ; the displayed pressure increases above the value when the A/C compressor is switched off. Check using the Vehicle diagnostic tester in "Guided Fault Finding".

Note. If the pressure displayed in the measured values block does not change, then the A/C compressor actuation is OK. Check using the Vehicle diagnostic tester in "Guided Fault Finding". Check again if the compressor is really driven if the A/C compressor regulator valve -N280- is being actuated; if the A/C compressor is driven and A/C compressor regulator valve is actuated, then there is a malfunction in the refrigerant circuit. Bring vehicle to a workshop that has the necessary tools and in which the work can be performed accordingly by qualified personnel. Refer to General Information (it is possible that A/C compressor regulation is not OK). Bring the problems determined to the attention of the workshop. A/C compressor regulator valve is activated by the Climatronic control module (via the A/C compressor regulator valve) so that temperature of air downstream of evaporator reaches the specified value (approximately 2 to 5 °C (35 to 41 °F): A value greater than 0.55A is displayed after vehicle start, depending on temperature, engine speed and vehicle voltage measured. As soon as the temperature measured by the evaporator vent temperature sensor -G263- nears the target value, the activation, and thus the compressor output, is reduced. Under certain operating conditions, residual moisture in the refrigerant circuit can lead to an ice build-up at the A/C Compressor Regulator Valve (and at expansion valve). A/C compressor control is reduced by this ice build-up, evaporator is cooled too intensely and freezes. The ice on the evaporator may cause various customer concerns. Refer to ICE FORMATION ON EVAPORATOR, LOCALIZING MALFUNCTION .

Press the button for recirculation mode on the Climatronic control module, (the symbol for "recirculation mode" in the air recirculation button illuminates).

Set engine speed of 2000 rpm (start of time measurement).

In "read measured values block" read the measured values for the evaporator vent temperature sensor -G263- using the Vehicle diagnostic tester in "Guided Fault Finding".

Compare the displayed value (from the evaporator vent temperature sensor) with the values in the diagram.

Scheme 281

A - Measured air temperature of Evaporator Vent Temperature Sensor (after evaporator)

B - Ambient temperature

C - Permissible tolerance range

Depending on ambient temperature, air temperature measured must be within stated tolerance range -C- after 5 minutes.

Note. If the required values are not reached, check the measuring value for the Evaporator Vent Temperature Sensor. Compare the displayed values from the evaporator vent temperature sensor with the measured values from the center outlet temperature sensor -G191- (on the "Basis") / with the Left Front Upper Body Outlet Temperature Sensor -G385- (on the "Comfort"). The measured value from the evaporator vent temperature sensor only slightly deviated from the measured value from the center outlet temperature sensor / Left front upper body vent temperature sensor. Perform -Identifying malfunctions if specified values are not obtained-. Refer to REQUIRED COOLING OUTPUT NOT REACH, MALFUNCTION NOTIFICATION . If the measured value of the evaporator vent temperature sensor is greater than the measured value of the center outlet temperature sensor or of the left front upper body outlet temperature sensor, then make sure the is installed correctly. Refer to EVAPORATOR VENT TEMPERATURE SENSOR -G263 and perform an electrical test on this sensor using the Vehicle diagnostic tester in "Guided Fault Finding". The function of the A/C unit is, for example recognizable, when the refrigerant line "low pressure side" (wide line between the quick acting coupling and the compressor) cools down and the refrigerant line "high pressure side" (narrow line between the condenser and quick acting coupling) warms up. Refer to REFRIGERANT CIRCUIT COMPONENT OVERVIEW .

If the Evaporator Vent Temperature Sensor -G263- measured value (and with it the cooling performance of the A/C) is OK, and if there is no complaint, then the cooling capacity test is completed

1. If the evaporator vent temperature sensor measured value (and with it the A/C cooling output) is not OK, then determine the malfunction causing the difference from the specified value (the required A/C cooling output is not reached). Refer to «REQUIRED COOLING OUTPUT NOT REACH, MALFUNCTION NOTIFICATION»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__required-cooling-output-not-reach-malfunction) .
2. If the evaporator vent temperature sensor. measured value (and with it the A/C cooling output) is OK, and if there is still a complaint that the vent temperatures are too high or differ, check the actuation of the temperature doors. Refer to Basis «HEATING OUTPUT AND TEMPERATURE DOOR ACTIVATION, CHECKING, BASIS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__heating-output-and-temperature-door-activation) or Comfort «HEAT OUTPUT AND TEMPERATURE DOOR ACTIVATION, CHECKING, COMFORT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__heat-output-and-temperature-door-activation) .

REQUIRED COOLING OUTPUT NOT REACH, MALFUNCTION NOTIFICATION

Test Continuation "The A/C compressor actuation is switched off"

CONTINUATION OF TEST: "PRESSURE IN REFRIGERANT CIRCUIT INCREASES"

Note. The pressure in the refrigerant circuit depends on several factors. However, in general, the pressure should not exceed 20 bar (290 psi) at an ambient temperature of 20 to 25 °C (68 to 77 °F). Pressures up to 31 bar (450 psi) may occur due to extremely high performance under severe conditions (such as in southern countries with a hot climate, "stop and go" traffic and high humidity). At ambient temperatures below 25 °C (77 °F), pressure in refrigerant circuit does not normally exceed 16 bar (coolant fans run and cool condenser). The Climatronic control module calculates the pressure in the coolant circuit via the A/C pressure/temperature sensor -G395- and displays it using the Vehicle diagnostic tester in "Guided Fault Finding". At an absolute pressure less than approximately 1.8 bar (26 psi) and greater than approximately 32 bar (464 psi), the Climatronic control module does not switch on the A/C compressor (the A/C compressor regulator valve is not actuated). The A/C compressor is only switched on once the absolute pressure becomes greater than 1.8 bar (26 psi) or less than 16 bar (232 psi). Additional information regarding the pressure in the refrigerant circuit can be found in Guided Fault Finding using the Vehicle diagnostic tester in "Guided Fault Finding" If the pressure in the refrigerant circuit or the engine coolant temperature is too high, the Climatronic control module regulates the compressor performance (to avoid sudden A/C compressor cut-off). As soon as pressure in refrigerant circuit exceeds 30 bar (435 psi) (absolute pressure), full A/C compressor performance is only enabled again after pressure has become less than 27 bar (391 psi), or coolant temperature exceeds 115 °C (239 °F) (it is switched off completely at 118 °C (244 °F)).

ICE FORMATION ON EVAPORATOR, LOCALIZING MALFUNCTION

1. The A/C compressor regulator valve -N280- is activated by Climatronic control module -J255- so that temperature of air downstream of evaporator reaches the specified value (approximately 2 to 5 °C) (35 to 41 °F)
2. A value greater than 0.55A is displayed after vehicle start, depending on temperature, engine speed and vehicle voltage measured. As soon as the temperature measured by the evaporator vent temperature sensor -G263- nears the target value, the activation, and thus the compressor output, is reduced.

Under certain operating conditions, residual moisture in the refrigerant circuit can lead to an ice build-up at A/C compressor regulator valve (and at expansion valve). A/C compressor control is reduced by this ice build-up, evaporator is cooled too intensely and freezes. The freeze-up of the evaporator can be the cause for the following customer complaints

After a long drive, A/C system repeatedly or sporadically fails (no cooling or heating performance), after switching off vehicle and after a short time, A/C function is OK again.

The windows fog up from the inside after driving for a long time; also, when using the "Defrost" button on the Climatronic control module and the windows do not clear up right away, after turning off the vehicle (or after turning off the A/C) and waiting a short time, the A/C system is OK again.

Corrective action

Check the measured value from the evaporator vent temperature sensor with the "Read measuring value block" function using the Vehicle diagnostic tester in "Guided Fault Finding".

If the measured value of the Evaporator Vent Temperature Sensor is too high under the conditions described by the customer (although the A/C is working properly, depending on the outside temperature greater than 10 °C (50 °F) for example) check the Evaporator Vent Temperature Sensor (an incorrect measured value can cause the evaporator to ice up).

Is the measured value from the evaporator vent temperature sensor is below the adjustment requirement described by the customer (at a temperature above 0 °C (32 °F), longer when it is lower than 0 °C (32 °F)). Bring vehicle to a workshop that has the necessary tools and in which the work can be performed accordingly by qualified personnel. Refer to General Information . Bring the problems determined to the attention of the workshop.

Check the refrigerant line "low pressure side" (wide line between the quick-release coupling and the A/C compressor), refer to REFRIGERANT CIRCUIT COMPONENT OVERVIEW with the engine running. If this line is thickly iced-up when a problem occurs (a very thin layer of ice is permitted), this indicates that the temperature in the evaporator is too low. Bring vehicle to a workshop that has the necessary tools and in which the work can be performed accordingly by qualified personnel. Refer to General Information (it is possible that A/C compressor regulation is not OK). Bring the problems determined to the attention of the workshop.

Note. Ice build up can occur on the evaporator under extreme circumstances for particularly unfavorable A/C system settings (for example airflow direction is set to the instrument panel vents and these vents are closed, set to MAX AC for a minimal fresh air blower speed). With this setting, there is no air flowing through the evaporator making the temperature at the evaporator vent temperature sensor higher than the actual evaporator temperature. It can be assumed for the A/C system regulator, that the measured value of the evaporator vent temperature sensor has the actual evaporator temperature and continues to activate the A/C compressor regulator valve and the evaporator cools too much.

Special tools and workshop equipment required

1. Vehicle Diagnostic Tester and the connection cable.
2. Battery charger, 60A VAS 5903
3. A standard thermometer (for temperature measurements, if necessary a thermometer with 2 measuring probes for simultaneous measurement for example, for temperature on the right and left)

Not for vehicles with mechanically driven A/C compressors

Perform only on vehicles with a high voltage system (hybrid vehicles with electrically driven A/C compressors)

Read all the warnings for working on high voltage vehicles. Refer to HIGH VOLTAGE SYSTEM (HYBRID VEHICLES) REPAIRS .

Check all high voltage components and cables for damage if it is necessary to work near high voltage components. Refer to VISUAL INSPECTION OF HIGH-VOLTAGE COMPONENTS AND CABLES FOR DAMAGE and High Voltage System General Warnings in HIGH VOLTAGE SYSTEM (HYBRID VEHICLES) REPAIRS .

Working on a high voltage system when activated or with the ignition turned on

Charge the vehicle battery using the VAS 5903 in the battery support mode to minimize the number of automatic starts during the test- and measuring procedures while the ready mode is active. Refer to [For engine(s) CAUA, CAEB, CALA] General Information .

Move the selector level into position "P", activate the parking brake and arrange the necessary tools for testing and measuring procedures that require the ready mode to be active or that require the ignition to be on, so that they cannot come into contact with the turning components in the engine and so that they are not in the vicinity of the turning components of a running engine.

Note. Also move the selector lever into position "P" and activate the parking brake for testing and measuring procedures which require the ignition to be on, but do not require the ready mode to be active. The ready mode is displayed in the instrument cluster control module -J285- above the "powermeter". Refer to the Owners Information. Activate and deactivate the ready mode. Refer to the Owners Information (consult the display in the instrument cluster control module).

Note. The ready mode is displayed in the instrument cluster control module -J285- above the "powermeter". Activate the ready mode (and watch the display in the instrument cluster control module). Refer to the Owners Information. Also move the selector lever into "P" and activate the parking brake for testing and measuring procedures which require the ignition to be on, but do not require the ready mode to be active.

On a high voltage vehicle poor or insufficient cooling by the battery cooling module, even though the evaporator cooling in the A/C is OK, may be caused by the following

1. The activation or function of the positioning motors on the battery cooling module (hybrid battery recirculation door positioning motor 1 -V479- and hybrid battery recirculation door positioning motor 2 -V480- is not OK, check the activation using the Vehicle diagnostic tester in "Guided Fault Finding" (for the battery regulation control module -J840-).
2. The activation or function of hybrid battery refrigerant shut-off valve 2 -N517- (if the component for the expansion valve on the battery cooling module is not OK, check the activation, using the Vehicle diagnostic tester in "Guided Fault Finding" (for the battery regulation control module).
3. The measured values from the temperature sensor inside the battery cooling module are not OK (Temperature sensor before hybrid battery evaporator -G756-, Temperature sensor after hybrid battery evaporator -G757-), check the measured values using the Vehicle diagnostic tester in "Guided Fault Finding" (for the battery regulation control module).
4. Check if the air guide for the battery cooling module (to or from the traction battery -A2-) or to or from the battery cooling module (for the forced air extraction of the vehicle) is not OK, refer to «AIR GUIDES FOR BATTERY COOLING MODULE OVERVIEW»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__air-guides-for-battery-cooling-module) .

Note. There are 2 evaporators installed in this vehicle (one in the air conditioner and one in the battery cooling module). If the measured temperature on one of the evaporators corresponds to the target value or the target value falls short, but does not reach the required target value on the other evaporator, the following adjustment is performed: the battery regulation control module -J840- activates the electric A/C compressor with increased speed (thereby increasing the A/C cooling output and decreasing the pressure on the low pressure side as well as the evaporator temperature) via the electric drive power and control electronics -JX1- and the A/C compressor control module -J842-. If the target value falls short for the temperature of one of the evaporators, the battery regulation control module activates the hybrid battery refrigerant shut-off valve 1 -N516- or the hybrid battery refrigerant shut-off valve 2 -N517-, so that the evaporator which is too cold is no longer supplied with refrigerant. Refer to the Vehicle diagnostic tester in "Guided Fault Finding" Function for the A/C System. Since the power for the evaporator in the battery cooling module is noticeably smaller than the power for the evaporator in the A/C system, the required target temperature may still potentially be reached in the battery cooling module with too little refrigerant in the refrigerant circuit, but the target temperature in the evaporator in the A/C system will no longer be attainable (even though the A/C compressor is activated with increased air conditioner speed).

1. A/C cooling output, testing requirements, refer to «A/C COOLING OUTPUT, TESTING REQUIREMENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2) .
2. Cooling output, checking, refer to «COOLING OUTPUT, CHECKING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2) .

Only for vehicles with a high voltage system (hybrid vehicles with electrically driven A/C compressor), not for vehicles with mechanically driven A/C compressor

1. Ambient temperature greater than 15 °C (59 °F).
2. Radiator and condenser are clean (if necessary clean)
3. The vehicle battery is charged during the test in the battery support mode via the battery charger. Refer to «[For engine(s) CAUA, CAEB, CALA] General Information»(/audi/a5/i-2007-2011/remont/charging-system/#battery-starter-generator-cruise-control-coupe) .
4. All air ducts, covers and seals OK and properly installed
5. Air flow through dust and pollen filter not obstructed by dirt. Refer to «DUST AND POLLEN FILTER»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__dust-and-pollen-filter) .
6. Air intake apparatus (in fresh air and recirculating air mode) is not impaired by soiling or components installed as retrofit.
7. Vehicle not exposed to sunlight
8. The engine is warm (the coolant temperature is higher than 80 °C (176 °F)).
9. There are no faults in DTC memory for the electric drive power and control electronics -JX1-, the battery regulation control module -J840- and the A/C compressor control module -J842- using the Vehicle diagnostic tester in "Guided Fault Finding".
10. Climatronic control module DTC memory was checked and erased, basic setting was performed and the Climatronic control module coding was checked using the Vehicle diagnostic tester in "Guided Fault Finding"
11. The Climatronic control module adaptation was checked using the Vehicle diagnostic tester in "Guided Fault Finding".
12. All instrument panel vents open
13. The hood is closed.
14. The ignition is turned on and the ready mode is activated, the engine runs only, when for, example, the traction battery -A2- has not been charged enough.

Charge the vehicle battery using the VAS 5903 in the battery support mode to minimize the number of automatic starts during the test- and measuring procedures while the ready mode is active. Refer to [For engine(s) CAUA, CAEB, CALA] General Information .

Note. The ready mode is displayed in the instrument cluster control module -J285- above the "powermeter". Activate the ready mode (and observe the display in the instrument cluster control module). Refer to the Owners Information. Also move the selector lever into position "P" and activate the parking brake for testing and measuring procedures which require the ignition to be on, but do not require the ready mode to be active.

Set the "Basis" Climatronic control module -J255- as follows

1. "Auto" operating mode (indicator light on the AUTO button lights up).
2. Temperature preselect "cold" (display "LO" in the MMI display).
3. The A/C compressor is on (the indicator lamp on the AC button comes on).
4. Preselect for the fresh air blower "maximum speed" (in the Multi Media Interface display, level "10" or greater).

The Climatronic control module of "Comfort" version is set as follows

1. "Auto" mode (the indicator lamp in both AUTO buttons illuminate).
2. Temperature preselect "cold" for the driver's and passenger's side (display "LO" for the driver's and passenger's die in the A/C Control Head display and in the Multi Media Interface display).
3. The A/C compressor is on (the indicator lamp on the AC button comes on).
4. Preselect for the fresh air blower "maximum speed" (display in the A/C Control Head and in the Multi Media Interface display, level "10" or greater).

Note. The indicator lamp in the AUTO button(s) goes out when the fresh air blower speed is changed manually. The maximum possible fresh air blower speed depends on several conditions (coolant temperature, vehicle voltage, etc.)

On vehicles equipped with the "Comfort" A/C system, the Rear Temperature Selection Potentiometer -G538- is set to "cold" (installed in the rear center console vent).

On vehicles equipped with the "Comfort" A/C system, the vent in the rear center console is open.

Functions in active ready mode

The coolant fan (coolant fan -V7- and coolant fan 2 -V177-) run (activation and speed depend on pressure in coolant circuit and engine temperature).

Note. Depending on the version of the Climatronic control module, the coolant fan and coolant fan 2) are only switched on at a certain pressure in the coolant circuit (currently, at a pressure of approximately 9 bar (130.5 psi)). The coolant fan(s) control is displayed in the measured values block. Refer to the Vehicle diagnostic tester in "Guided Fault Finding".

The Fresh Air Blower -V2- runs with maximum speed ("10" or greater).

Note. The maximum possible fresh air blower speed depends on several conditions (coolant temperature, vehicle voltage, etc.)

The air conditioner goes in recirculation mode (approximately 1 minute after starting the engine/activating the ready mode, the back pressure/fresh air door is closed and the recirculation door is opened, fresh air blower extracts the air from passenger compartment below instrument panel / behind the glove compartment).

Note. If one of these requirements is not met, check the DTC memory for the Climatronic control module and then perform the output diagnostic test mode and read the measured values block. Refer to the Vehicle diagnostic tester in "Guided Fault Finding".

Only for vehicles with a high voltage system (hybrid vehicles with electrically driven A/C compressor), not for vehicles with mechanically driven A/C compressor

1. The requirements for testing the cooling capacity are fulfilled, refer to «A/C COOLING OUTPUT, TESTING REQUIREMENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2) .

Measure the ambient temperature (must be warmer than 15 °C) (59 °F).

Close the doors, the engine hood, the windows, the sunroof and the rear lid.

Open all instrument panel vents.

Charge the vehicle battery using the VAS 5903 in the battery support mode to minimize the number of automatic starts during the test- and measuring procedures while the ready mode is active. Refer to [For engine(s) CAUA, CAEB, CALA] General Information .

Note. The ready mode is displayed in the instrument cluster control module -J285- above the "powermeter". Activate the ready mode (and observe the display in the instrument cluster control module -J285-). Refer to the Owners Information. Also move the selector lever into position "P" and activate the parking brake for testing and measuring procedures which require the ignition to be on, but do not require the ready mode to be active.

The ignition is turned on and the ready mode is active, the engine runs only, when for example, the traction battery -A2- has not been charged enough.

Switch off the A/C compressor (set the "Econ" mode on the Climatronic control module -J255-. The indicator lamp in the AC button does not illuminate).

Perform a Guided Fault Finding on the A/C system using the Vehicle diagnostic tester in "Guided Fault Finding".

In the "read measured values block", select the display group with the measured values for the activation of the compressor control and refrigerant circuit pressure and read the measured values (for an electric A/C compressor -V470-, the display occurs in various measured value blocks). Refer to the Vehicle diagnostic tester in "Guided Fault Finding".

1. The A/C compressor is turned off if there is no compressor speed displayed.
2. The pressure in the refrigerant circuit is same as the measured outside temperature or greater than the value in the chart.

Note. At absolute pressure, 0 bar corresponds to absolute vacuum. Normal ambient pressure equals approximately 1 bar (14.5 psi) absolute pressure and 0 bar pressure. On the scales of most pressure gauges, 0 bar pressure corresponds to an absolute pressure of one bar (can be seen from -1 mark below 0). Depending on version of the Climatronic control module -J255-, only integer values may be displayed in the measured values block, if the pressure measured lies between two values the display switches back and forth. The display for the activation of the A/C compressor is different. For a mechanically driven A/C compressor, the target and actual current for the activation of the A/C compressor regulator valve -N280- is displayed. The specified and actual electrical A/C compressor -V470- RPM transmitted by the A/C compressor control module -J842-, appears in a different measured values block for an electrical A/C compressor. Refer to the Vehicle diagnostic tester in "Guided Fault Finding". Pressure in refrigerant circuit is governed by ambient temperature. On account of heat given off by components (for example, radiator), pressure displayed with warm engine will be slightly higher than that given for the respective ambient temperature. If pressure displayed is below that indicated in table. Check the signal coming from the A/C pressure/temperature sensor -G395- using the Vehicle diagnostic tester in "Guided Fault Finding". If no fault is determined at the A/C pressure/temperature sensor, there is insufficient coolant in the circuit. Bring vehicle to a workshop that has the necessary tools and in which the work can be performed accordingly by qualified personnel. Refer to General Information .

Refrigerant circuit pressure OK

Switch the A/C compressor on by selecting the "Auto" mode on the Climatronic control module (the indicator lamps in the AUTO buttons and the AC button illuminate).

Using the dial on the Climatronic control module, set the temperature preselect to "cold" (for the driver and passenger side).

On vehicles with the "Comfort" A/C system, set the rear temperature selection potentiometer -G538- to "cold" (installed in the rear center console vent).

Using the rotary switch on the Climatronic control module set the vent direction to "instrument panel vents" (for the driver's and passenger's side).

Note. The indicator lamp in the one or both AUTO buttons goes out when the vent direction for the air or fresh air blower speed is manually changed. The maximum possible fresh air blower speed depends on several conditions (coolant temperature, vehicle voltage, etc.)

Read the RPM in "read measured values block", with which the A/C compressor control module -J842- activates the electric A/C compressor (a RPM higher than 800/ min is displayed while the A/C compressor is running). Refer to the Vehicle diagnostic tester in "Guided Fault Finding".

Note. The Climatronic control module calculates the specified RPM and then data bus sends the request to the A/C compressor control module. Refer to the Vehicle diagnostic tester in "Guided Fault Finding". The A/C compressor operates in the drive mode with a speed of 800 through 8600 revolutions/minute. The A/C compressor will not activate at the maximum speed (the A/C compressor speed is limited to about 5000/min) specified (from approximately 8500/min) for a stopped or slow moving vehicles (until the vehicle reaches a speed of about 45km/h (28 mph). The A/C compressor power (the delivery volume) and a high fresh air blower speed (inefficient environmental controls) is not always sufficient enough for a A/C compressor speed of 5000/min to lower the temperature of the air for a very high outside air temperature (more than 35° C (95 °F) to the target value according to the evaporator. To check the regulation of the A/C compressor under these conditions activate the fresh air blower only more than approximately 40% of the maximum voltage and check the temperature for a reduced fresh air blower speed. Refer to the Vehicle diagnostic tester in "Guided Fault Finding". If little to no RPM is displayed in the measured values block (whether the required air temperature after the evaporator is not yet achieved; the RPM is less than 4000 /min), check the activation of the electric A/C compressor -V470- by the A/C compressor control module -J842-. Refer to the Vehicle diagnostic tester in "Guided Fault Finding".

In "read measured values block" read the refrigerant circuit pressure measured by the A/C pressure/temperature sensor -G395- ; the displayed pressure increases above the value when the A/C compressor is switched off the Vehicle diagnostic tester in "Guided Fault Finding"

Note. There is a fault in the refrigerant circuit if the pressure displayed in the measured values block does not change even though the A/C compressor actuation is OK. Refer to the Vehicle diagnostic tester in "Guided Fault Finding". Bring vehicle to a workshop that has the necessary tools and in which the work can be performed accordingly by qualified personnel. Refer to General Information (it is possible that A/C compressor regulation is not OK). Bring the problems determined to the attention of the workshop. The A/C compressor is activated by the A/C compressor control module -J842- (at the request from the A/C system Climatronic control module) so that the air temperature according to the evaporator reaches the specified value (approximately 2 to 5 °C (35 to 41 °F). Activated after the vehicle starts, depending on the measured temperature, the engine speed and the electrical system voltage for the A/C compressor with a speed greater than 3000 /min. As soon as the temperature measured by the evaporator vent temperature sensor -G263- nears the target value, the activation, and thus the compressor output, is reduced. Under certain operating conditions, moisture in the refrigerant circuit can lead to ice build-up on the expansion valve for the evaporator in the A/C system. The A/C compressor/ expansion valve control is reduced by this ice build-up, evaporator is cooled too intensely and potentially freezes. The ice on the evaporator may cause various customer concerns. Refer to ICE FORMATION ON EVAPORATOR, LOCALIZING MALFUNCTION . There are 2 evaporators installed in this vehicle (one in the air conditioner and one in the battery cooling module). If the measured temperature on one of the evaporators corresponds to the target value or the target value falls short, but does not reach the required target value on the other evaporator, the following adjustment is performed: the battery regulation control module -J840- activates the electric A/C compressor with increased speed (thereby increasing the A/C cooling output and decreasing the pressure on the low pressure side as well as the evaporator temperature) via the electric drive power and control electronics -JX1- and the A/C compressor control module -J842-. If the target value falls short for the temperature of one of the evaporators, the battery regulation control module -J840- activates the hybrid battery refrigerant shut-off valve 1 -N516- or the hybrid battery refrigerant shut-off valve 2 -N517-, so that the evaporator which is too cold is no longer supplied with refrigerant. Refer to the Vehicle diagnostic tester in "Guided Fault Finding" Function for the A/C System. Since the power for the evaporator in the battery cooling module is noticeably smaller than the power for the evaporator in the A/C system, the required target temperature may still potentially be reached in the battery cooling module with too little refrigerant in the refrigerant circuit, but the target temperature in the evaporator in the A/C system will no longer be attainable (even though the A/C compressor is activated with increased air conditioner speed).

Press the button for recirculation mode on the Climatronic control module, (the symbol for "recirculation mode" in the air recirculation button illuminates).

In "read measured values block" read the measured values for the evaporator vent temperature sensor -G263- using the Vehicle diagnostic tester in "Guided Fault Finding".

Compare the displayed value (from the evaporator vent temperature sensor) with the values in the diagram.

A - Measured air temperature of evaporator vent temperature sensor (after evaporator)

B - Ambient temperature

C - Permissible tolerance range

Depending on ambient temperature, air temperature measured must be within stated tolerance range -C- after 5 minutes.

Note. If the required values are not reached, check the measuring value for the evaporator vent temperature sensor. Compare the displayed values from the evaporator vent temperature sensor with the measured values from the center outlet temperature sensor -G191- (on the "Basis") / with the Left Front Upper Body Outlet Temperature Sensor -G385- (on the "Comfort"). The measured value from the evaporator vent temperature sensor only slightly deviated from the measured value from the center outlet temperature sensor / left front upper body outlet temperature sensor. Perform -Identifying malfunctions if specified values are not obtained- REQUIRED COOLING OUTPUT NOT REACH, MALFUNCTION NOTIFICATION . If the measured value of the evaporator vent temperature sensor is greater than the measured value of the center outlet temperature sensor or of the left front upper body outlet temperature sensor, then make sure the evaporator vent temperature sensor is installed correctly. Refer to EVAPORATOR VENT TEMPERATURE SENSOR -G263 and perform an electrical test on this sensor using the Vehicle diagnostic tester in "Guided Fault Finding". The function of the A/C unit is, for example recognizable, when the refrigerant line "low pressure side" (wide line between the quick acting coupling and the compressor) cools down and the refrigerant line "high pressure side" (narrow line between the condenser and quick acting coupling) warms up. Refer to REFRIGERANT CIRCUIT COMPONENT OVERVIEW .

If the evaporator vent temperature sensor measured value (and with it the cooling performance of the A/C) is OK, and if there no complaint, then the cooling capacity test is completed

1. If the evaporator vent temperature sensor measured value (and with it the A/C cooling output) is not OK, then determine the malfunction causing the difference from the specified value, refer to «REQUIRED COOLING OUTPUT NOT REACH, MALFUNCTION NOTIFICATION»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2) .
2. If the evaporator vent temperature sensor measured value (and with it the A/C cooling output) is OK, and if there is still a complaint that the vent temperatures are too high or differ, check the actuation of the temperature flaps. Refer to Basis «HEATING OUTPUT AND TEMPERATURE DOOR ACTIVATION, CHECKING, BASIS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__heating-output-and-temperature-door-activation) or Comfort «HEAT OUTPUT AND TEMPERATURE DOOR ACTIVATION, CHECKING, COMFORT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__heat-output-and-temperature-door-activation) .

Note. The hybrid battery refrigerant shut-off valve 1 -N516- installed in the refrigerant line for the expansion valve in front of the evaporator in the A/C system, is not open when it is active. Check the functionality if this valve is activated or closed as refrigerant can flow through the expansion valve. Refer to the Vehicle diagnostic tester in "Guided Fault Finding" (for the battery regulation control module).

If the measured value of the evaporator vent temperature sensor (and thus the cooling output of the rear A/C system) is OK, and if there is a complaint due to a lack of cooling output for the battery cooling module

1. Check the activation and function of the battery cooling module by the battery regulation control module. Refer to the Vehicle diagnostic tester in "Guided Fault Finding".

Note. The hybrid battery refrigerant shut-off valve 2 -N517- attached to the battery cooling module expansion valve is closed when it is not active. Check the functionality. Refer to the Vehicle diagnostic tester in "Guided Fault Finding" (for the battery regulation control module).

TEST CONTINUATION "THE A/C COMPRESSOR ACTUATION IS SWITCHED OFF"

Note. The pressure in the refrigerant circuit depends on several factors. However, in general, the pressure should not exceed 20 bar (290 psi) at an ambient temperature of 20 to 25 °C (68 to 77 °F). Pressures up to 31 bar (450) may occur due to extremely high performance under severe conditions (such as in southern countries with a hot climate, "stop and go" traffic and high humidity). At ambient temperatures below 25 °C (77 °F), pressure in refrigerant circuit does not normally exceed 16 bar (232 psi) coolant fans run and cool condenser). The Climatronic control module calculates the pressure in the coolant circuit via the A/C pressure/temperature sensor -G395- and displays it on the Vehicle diagnostic tester in "Guided Fault Finding". At an absolute pressure of less than approximately 1.8 bar (26 psi) or greater than approximately 32 bar (464 psi), the Climatronic control module does not switch on the A/C compressor (the A/C compressor control module -J842- and therefore the electric A/C compressor -V470- is not activated). The A/C compressor is only switched on once the absolute pressure becomes greater than 1.8 bar (26 psi) or less than 16 bar (232 psi). Additional information regarding the pressure in the refrigerant circuit can be found in Guided Fault Finding using the Vehicle diagnostic tester in "Guided Fault Finding" function. If the pressure in the refrigerant circuit or the engine coolant temperature is too high, the Climatronic control module regulates the compressor performance (to avoid sudden A/C compressor cut-off). As soon as pressure in refrigerant circuit exceeds 30 bar (435 psi) (absolute pressure), full A/C compressor performance is only enabled again after pressure has become less than 27 bar (391 psi), or coolant temperature exceeds 115 °C (239 °F) it is switched off completely at 118 °C (244 °F).

1. The electric A/C compressor -V470- is activated via the A/C compressor control module -J842- from the Climatronic control module -J255- so that the air temperature reaches the specified value according to the evaporator (approximately 2 to 5 °C) (35 to 41 °F).
2. After the turning on the ignition and depending on the speed of the vehicle, the measured temperature and the electrical system voltage displays a value greater than 4000 /min. As soon as the temperature measured by the evaporator vent temperature sensor -G263- nears the target value, the activation, and thus the compressor output, is reduced.

If the measured value of the evaporator vent temperature sensor is faulty (too high), the following complaints may occur

After a long drive, A/C system repeatedly or sporadically fails (no cooling or heating performance), after switching off vehicle and after a short time, A/C function is OK again.

After a longer drive, the windows fog up on the inside, also when using the "Defrost" button, the Climatronic control module and the windows do not clear up right away, after turning the vehicle off and after a short wait, the function of the A/C unit is OK again.

Corrective action

Check the measured value from the evaporator vent temperature sensor with the "Read measuring value block" function of the Vehicle diagnostic tester in "Guided Fault Finding".

If the measured value of the evaporator vent temperature sensor is too high under the conditions described by the customer (although the A/C is working properly, depending on the outside temperature greater than 10 °C (50°F) for example check the evaporator vent temperature sensor (an incorrect measured value can cause the evaporator to ice up).

If the measured value of sensor for the evaporator vent temperature sensor is too low under conditions of use described by the customer (at an ambient temperature above 0 °C (32 °F), colder than 0 °C (32 °F) for long period of time), check the activation of the electric A/C compressor -V470- and the hybrid battery refrigerant shut-off valve 1 -N516- from the battery regulation control module -J840-. If, for instance, the hybrid battery refrigerant shut-off valve 1 in the hybrid engine is not correctly activated (no activation, even though it is only important to cool the traction battery -A2-) the evaporator in the A/C system may ice up.

Check the refrigerant line "low pressure side" (wide line between the quick-release coupling and the A/C compressor) with the engine running. Refer to REFRIGERANT CIRCUIT COMPONENT OVERVIEW . If this line is thickly iced-up when a problem occurs (a very thin layer of ice is permitted), this indicates that the temperature in the evaporator is too low. Check the measured values for the evaporator vent temperature sensor as well as the activation and functionality of the electric A/C compressor, of the hybrid battery refrigerant shut-off valve 1 -N516-, of the hybrid battery refrigerant shut-off valve 2 -N517-, of the A/C compressor control module -J842- and of the battery regulation control module -J840-. Bring the vehicle to a workshop that has the necessary tools and in which the work can be performed accordingly by qualified personnel if there is a malfunction in the electrical A/C compressor, hybrid battery refrigerant shut-off valve 1, hybrid battery refrigerant shut-off valve 2 or the A/C compressor control module. Refer to the Vehicle diagnostic tester in "Guided Fault Finding" and General Information . Bring the problems determined to the attention of the workshop.

Note. Ice build up can occur on the evaporator under extreme circumstances for particularly unfavorable A/C system settings (for example airflow direction is set to the instrument panel vents and these vents are closed, set to MAX AC for a minimal fresh air blower speed). With this setting, there is no air flowing through the evaporator making the temperature at the evaporator vent temperature sensor higher than the actual evaporator temperature. It can be assumed for the A/C system regulator, that the measured value of the evaporator vent temperature sensor has the actual evaporator temperature and continues to activate the A/C compressor regulator valve -N280- and the evaporator cools too much.

AIR QUALITY SENSOR -G238- / HUMIDITY SENSOR IN FRESH AIR INTAKE DUCT -G657-, CHECKING

Special Tools and Equipment

1. Vehicle Diagnostic Tester with diagnostic cable VAS 5051/5A
2. Commercially available gas lighter (for checking air quality sensor)

Note. There are different versions depending on the vehicle date of manufacture and which A/C system ("Basis" or "Comfort") is installed. Refer to AIR QUALITY SENSOR -G238- AND HUMIDITY SENSOR IN FRESH AIR INTAKE DUCT -G657- FUNCTION . The air quality sensor is installed only on vehicles with the "Comfort" A/C system. The humidity sensor in fresh air intake duct is only installed on vehicles from MY 12 as a running change. Refer to AIR QUALITY SENSOR -G238- AND HUMIDITY SENSOR IN FRESH AIR INTAKE DUCT -G657- FUNCTION . The air quality sensor and the humidity sensor in fresh air intake duct need approximately 2 minutes to reach their operating temperature after turning on the ignition. The function of the air quality sensor and of the humidity sensor in fresh air intake duct is limited during this warm-up phase. During the warm-up phase, air quality sensor malfunctions may occur under certain ambient conditions. Replace the air quality sensor only if the air quality sensor is repeatedly appearing as defective. If, switching the ignition off and then on again, (waiting at least 2 minutes) the air quality sensor malfunction display changes from "static" to "sporadic", then the air quality sensor is OK and the and the malfunction entry no longer needs to be monitored (erase the DTC memory) using the Vehicle diagnostic tester in "Guided Fault Finding". The function of the humidity sensor in fresh air intake duct can only be checked via the "Guided Fault Finding". The measured values of the humidity sensor in fresh air intake duct are evaluated via the "read measured values" function and compared to the temperature and humidity measured at the installation location of the humidity sensor in fresh air intake duct. Refer to the Vehicle diagnostic tester in "Guided Fault Finding".

Test Requirements

1. Vehicle standing in a clean atmosphere (away from running engines, exhaust vents, etc.)
2. Engine compartment and the plenum chamber are clean (not contaminated with oil or fuel)
3. The engine compartment and the plenum chamber were not sprayed with cleaning agents or preservatives containing solvents
4. "Automatic recirculating air mode" is switched on.

Note. It is possible to switch the "automatic recirculating air mode" on or off via the "A/C System" in the "Car" menu in the MMI (Multi Media Interface). Refer to the Infotainment / MMI Operating Instructions.

1. Check the function of the humidity sensor in fresh air intake duct. Refer to the Vehicle diagnostic tester in "Guided Fault Finding".

Checking

With High Voltage Systems (hybrid vehicles)

Read and follow all of the supplemental warnings for all work performed on vehicles with the high voltage system, refer to HIGH VOLTAGE SYSTEM (HYBRID VEHICLES) REPAIRS

If it is necessary for the following procedure to perform work in the vicinity of high voltage components, perform a visual inspection of the high voltage components and cables for damages, refer to VISUAL INSPECTION OF HIGH-VOLTAGE COMPONENTS AND CABLES FOR DAMAGE and always follow the warnings when working on the high voltage system. Refer to HIGH VOLTAGE SYSTEM (HYBRID VEHICLES) REPAIRS .

Turn off the ignition.

Remove the rubber seal -A- and the plenum chamber cover -B- (there are different versions). Refer to Removal and Installation .

Scheme 282

1. Inspect the high voltage components -D- (the electric drive power and control electronics -JX1-) and the high voltage cables -E- after removing the plenum chamber cover -B-. Refer to «VISUAL INSPECTION OF HIGH-VOLTAGE COMPONENTS AND CABLES FOR DAMAGE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__visual-inspection-of-high-voltage-components-and) .

1. Be careful not to damage any high voltage components -D- or the high voltage cables -E-. Refer to «VISUAL INSPECTION OF HIGH-VOLTAGE COMPONENTS AND CABLES FOR DAMAGE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__visual-inspection-of-high-voltage-components-and) .
2. Inspect the high voltage components -D- and high voltage cables -E- after completing the work procedure and before installing the plenum chamber cover -B-. Refer to «VISUAL INSPECTION OF HIGH-VOLTAGE COMPONENTS AND CABLES FOR DAMAGE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__visual-inspection-of-high-voltage-components-and) .

Working on a high voltage system when activated or with the ignition turned on

Charge the vehicle battery using the VAS 5903 in the battery support mode to minimize the number of automatic starts during the test- and measuring procedures while the ready mode is active. Refer to General Information

Move the selector level into position "P", activate the parking brake and arrange the necessary tools for testing and measuring procedures that require the ready mode to be active or that require the ignition to be on, so that they cannot come into contact with the turning components in the engine and so that they are not in the vicinity of the turning components of a running engine.

Note. Also move the selector lever into position "P" and activate the parking brake for testing and measuring procedures which require the ignition to be on, but do not require the ready mode to be active. The ready mode is displayed in the instrument cluster control module -J285- above the "powermeter". Refer to the Owners Information. Activate and deactivate the ready mode. Refer to the Owners Information (consult the display in the instrument cluster control module).

Without A High Voltage System

Turn off the ignition.

Pull the left rubber seal -B- as far as necessary. Refer to Removal and Installation .

Scheme 283

Remove the fresh air intake cover on the wind cowl -A- or the wind cowl (different styles). Refer to Removal and Installation .

Note. If necessary, carefully loosen the wind cowl from the windshield cross member -C-. Refer to Removal and Installation .

All vehicles

With the ignition switched off, connect the Vehicle Diagnostic Tester with Diagnostic Cable - 3 Meter VAS 5051/5A to the 16-pin Data Link Connector (DLC) of vehicle and perform the self diagnosis using the Vehicle diagnostic tester in "Guided Fault Finding" function.

Turn on the ignition (vehicles with the high voltage system).

Start the engine (vehicles without the high voltage system).

Note. The vehicle electrical system may turn off the engine on a vehicle with the Start/Stop System.

Check DTC memory of the Climatronic control module -J255- using the Vehicle diagnostic tester in "Guided Fault Finding".

Set the Climatronic control module to "Auto" ("Comfort" system).

Using the MMI (Multi Media Interface) set "automatic recirculating air mode" in the Climatronic control module display and control head (refer to => Infotainment / MMI operating instructions).

Wait 2 minutes. (Air Quality Sensor -G238- warm-up time).

Using the Vehicle diagnostic tester select "read measured values block" and then read the measured values for the air quality sensor using the Vehicle diagnostic tester in "Guided Fault Finding".

Note. The NOx- portion (nitrogen oxide) and the CO- portion (carbon monoxide) in the air measured by the air quality sensor is displayed in the measured values block; explanation for possible displays using the Vehicle diagnostic tester in "Guided Fault Finding"

Rotate the air quality sensor -A- approximately 90° to the left and remove it from the fresh air intake -C-.

Scheme 284

Allow a little bit of gas from a lighter -B- to flow past from the top area -A- of the air quality sensor.

Scheme 285

Note. If the air quality sensor comes in contact with cigarette smoke or with gas from an igniter, it will react since igniter gas is heavier than air. Remove the air quality sensor.

Select and read the air quality sensor measured values using the Vehicle diagnostic tester in "Guided Fault Finding".

Target values

1. The measured values increase contrary to the output value and show that both sensors in the air quality sensor are working correctly and the measured values are correctly evaluated.

Wait a short period time (approximately 1 minute, depending on amount of test gas flowing into the sensor).

Read the air quality sensor measured values.

Target values

1. The measured values will return to the output values and by doing so, show that both sensors are working correctly, and that the sensor electronics evaluated the measured values correctly.

Note. Due to changed pollution values, it is possible that different values can be displayed than those by the first measuring.

Read the display with the measured values for the A/C operating status (recirculation/fresh air operation).

Target values

1. The display field will show that the A/C is working in the fresh air mode.

Note. If a deviating value from the "fresh air mode" is displayed in the measured values block, then there is already a request for recirculating air mode (for example, due to the request for "maximum cooling output" or "manual recirculating air mode)" select a setting that does not require recirculating air mode. If it appears in the measured values block that the air quality sensor is already requesting automatic air recirculation, then, if necessary, clean the plenum chamber or move the vehicle into an area where the air is cleaner. Check using the Vehicle diagnostic tester in "Guided Fault Finding".

Allow a little bit of gas from a lighter -B- to flow past from the top area -A- of the air quality sensor.

Read the recirculation/fresh air mode display.

Target values

1. In the measured values block, it will be displayed that a request for air recirculation is present and that the A/C system is working in the air recirculation mode.

Note. If it shows in the measured values block that the air quality sensor has requested automatic air recirculation, this request will not be performed based on a shut-off requirement from the Climatronic control module. Repair cause for this switch off condition. Verify using the Vehicle diagnostic tester in "Guided Fault Finding". In order to avoid frequent shifting of the recirculated air/fresh air doors and the recirculation doors, the requirement of the air quality sensor for "Automatic air recirculation" mode remains for at least 25 seconds (minimum duration period), even if the pollutant concentration is so far reduced that recirculated air mode is no longer necessary.

Wait a short period time (approximately 1 minute, depending on amount of test gas flowing into the sensor).

1. If the measured value block shows that there is no longer a request for air recirculation, then the A/C system is working again in the fresh air mode.

If the function of Air Quality Sensor -G238- is OK for this test and there is a customer complaint continue as follows

Check the dust and pollen filter for soiling. Refer to DUST AND POLLEN FILTER .

With the ignition switched off, connect the Vehicle Diagnostic Tester with Diagnostic Cable - 3 Meter VAS 5051/5A to the 16-pin Data Link Connector (DLC) of vehicle and perform the self diagnosis using the Vehicle diagnostic tester in "Guided Fault Finding"

Using the Vehicle Diagnostic Tester select "Read measured value block" using the Vehicle diagnostic tester in "Guided Fault Finding".

Note. Second person is required to read out values displayed whilst driving.

Always pay attention to the safety instructions when using the Vehicle diagnostic tester in "Guided Fault Finding"

Read the displays in the measured value block for the air quality sensor values and the recirculation/fresh air mode request.

Drive the vehicle into an area with a relatively clean atmosphere (system in fresh-air mode).

Then drive vehicle into an area where the atmosphere is polluted (for example, onto an uphill road with truck traffic).

Read the displays in the different display fields. The displays in the different display fields must change; for example, when driving through a diesel exhaust cloud.

Note. Pay attention to the descriptions DUST AND POLLEN FILTER and AIR QUALITY SENSOR -G238- AND HUMIDITY SENSOR IN FRESH AIR INTAKE DUCT -G657- FUNCTION .

A/C COMPONENTS CONTROLLED OR ACTIVATED BY OTHER CONTROL MODULES, ELECTRICAL TESTS

Note. Different A/C components are not controlled directly by the Climatronic Control Head -J255-. The A/C compressor regulator valve -N280-, for example, is controlled by the vehicle electrical system control module -J519-. The data is exchanged via the databus system between both control modules. Check using the Vehicle diagnostic tester in "Guided Fault Finding". The measured values on the different A/C components are not evaluated directly by the Climatronic control module. For example, the pressure signal from the A/C Pressure/Temperature Sensor -G395- is evaluated from the Vehicle Electrical System Control Module and the measured values are sent via the data bus system to the Climatronic control module. Check using the Vehicle diagnostic tester in "Guided Fault Finding" function and the appropriate SYSTEM WIRING DIAGRAM. From MY 2010, some vehicles have a Start/Stop System for specific engines as optional equipment. The setting on the Climatronic control module can prevent the Stop function. If, for example, "defrost" is selected, the stop function is not possible or will be interrupted and the engine will start. The same applies in the case of heating and cooling. The difference between the selected and actual temperature is greater than a specified value. Check using the Vehicle diagnostic tester in "Guided Fault Finding".

COMPONENTS ACTUATED BY A/C SYSTEM, ELECTRICAL TEST

Note. Various vehicle electrical components (for example Rear window defogger -Z1- and heated seats) that do not belong to the heater are activated by the Climatronic Control Module -J255-. Using the rear window defogger as an example, the turn on request is sent via the Data bus to the comfort system central control module -J393- to turn on the rear window defogger. Refer to appropriate SYSTEM WIRING DIAGRAM. The Comfort system central module will then turn on the rear window defogger via the rear window defogger relay -J9-. Electrical testing of these components must be performed as described in Guided Fault Finding for the A/C system and the Central Control Unit for Comfort Systems. -J393-. Refer to the Vehicle diagnostic tester in "Guided Fault Finding".

1. Checking the rear window defogger -Z1-, refer to «REAR WINDOW DEFOGGER -Z1-, CHECKING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__rear-window-defogger-z1-checking) .
2. Front seat heating and ventilation, checking, refer to «FRONT SEAT HEATING AND VENTILATION, CHECKING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__front-seat-heating-and-ventilation-checking) .

REAR WINDOW DEFOGGER -Z1-, CHECKING

Note. If there is a condition that the heating for the rear window cannot be switched on (short circuit in the connection to the Rear Window Defogger Relay -J9-, interruption in the current supply to the Comfort System Central Control Module -J393- etc.), this will be stored as a malfunction in the Comfort System Central Control Module -J393- and the information will be sent via the data bus system to the Climatronic Control Unit -J255- ; this must be read in the DTC memory of the Comfort System Central Control Module using the Vehicle diagnostic tester in "Guided Fault Finding". The rear window defogger -Z1- control is displayed in the comfort system central control module measured value block. Check using the Vehicle diagnostic tester in "Guided Fault Finding". If the stored value in the vehicle electrical system control module -J519- or the measured voltage on terminal "30" falls below a value stored in the vehicle electrical system control module or in the Climatronic control module, the rear window heating will be switched off completely (or the power reduced) and by doing so, the load on the generator -C- is reduced. Refer to the Vehicle diagnostic tester in "Guided Fault Finding". If the heated rear window must be switched off due to low voltage, the window heater lamp button in the Climatronic control module stays on. If the switch-off lasts longer than 150 seconds, then the Climatronic control module will switch off the indicator lamp. The Climatronic control module measured values block indicates that the rear window heating is switched on or why no activation is occurring despite a request. Refer to the Vehicle diagnostic tester in "Guided Fault Finding". The function test for the heated rear window control is described in the Guided Fault Finding for the comfort system central control module -J393-. Refer to the Vehicle diagnostic tester in "Guided Fault Finding". The heated rear window stays switched on at outside temperatures up to 0 °C (32 °F) until ignition is switched off (heated rear window can be switched manually at anytime). If temperature becomes greater than 0 °C (32 °F) during a driving period, switch-off of rear window defogger occurs after the operating time stored in the Climatronic control module has elapsed (approximately 10 minutes). Refer to the Owner's manual. The heated rear window is switched off at an outside temperature higher than 0 °C (32 °F) by the Climatronic control module after approximately 10 minutes (activation time depends on the coding and the version of the Climatronic control module). Check using the Vehicle diagnostic tester in "Guided Fault Finding". From MY 2010, some vehicles have a Start/Stop System for specific engines as optional equipment. On vehicles with Start/Stop, the rear window defogging can be switched off whenever the Stop function is active (to protect the battery -A-). The setting for the rear window defogger remains stored in the Climatronic control module. After the engine is started again by the Start function, rear window defogging is switched on again. Check using the Vehicle diagnostic tester in "Guided Fault Finding".

FRONT SEAT HEATING AND VENTILATION, CHECKING

Components which participate in the control of the seat heating and seat ventilation

The Climatronic Control Module -J255- sends the request to switch on the seat heating / seat ventilation vie the data bus system comfort to the respective control unit (the control unit depends on the vehicle version and vehicle equipment level, refer to the Vehicle diagnostic tester in "Guided Fault Finding" function for each control unit).

1. On vehicles without a memory seat/steering column adjustment control module -J136-, the vehicle electrical system control module -J519- directly controls the driver seat heating. The seat ventilation, where applicable, is controlled via the left front seat ventilation control module -J800- by the vehicle electrical system control module -J519- (different measured values block assignment in the vehicle electrical system control module).
2. On vehicles without a passenger memory seat control module -J521-, the vehicle electrical system control module -J519- directly controls the passenger seat heating. The seat ventilation, where applicable, is controlled via the right front seat ventilation control module -J799- by the vehicle electrical system control module (different measured values block assignment in the vehicle electrical system control module -J519-).
3. On vehicles equipped with a driver seat with entry assist and/or memory function, the Memory Seat/Steering Column Adjustment Control Module -J136- directly controls the driver's seat heating and seat ventilation, if applicable (different measured value block assignment in the Vehicle Electrical System Control Module).
4. On vehicles with front passenger seat with power entry assist, the Passenger Memory Seat Control Module -J521- control the passenger seat heating.
5. From MY 2010, some vehicles have a Start/Stop System for specific engines as optional equipment. If the vehicle has the Start/Stop System, the seat heating and ventilation can be switched off whenever the Stop function is active (to protect the battery -A-). The setting for the heated seat control (and seat ventilation) remains stored in the Climatronic control module -J255-. After the engine is started again by the Start function, seat heating and ventilation is switched on again. Check using the Vehicle diagnostic tester in "Guided Fault Finding".

Note. The control of the right front seat ventilation control module -J799- and the left front seat ventilation control module -J800- by the vehicle electrical system control module -J519- takes place via a local Data bus. Refer to appropriate SYSTEM WIRING DIAGRAM. The control of the seat heating and seat ventilation can be different between the Audi A5 and Audi A4. Refer to appropriate SYSTEM WIRING DIAGRAM. The display of the different data for controlling the seat heating and ventilation (by the Climatronic control module transmitted setting, the specified and actual seat temperature, etc.) is performed by the different vehicle electrical system control module -J519- measured value blocks and / or by the Memory Seat/Steering Column Adjustment Control Module -J136-. Refer to the Vehicle diagnostic tester in "Guided Fault Finding" depending on the vehicle version and equipment.

Scheme 286

Scheme 287

Scheme 288

1. If there is a condition, where the heating or ventilation of the driver or passenger seat cannot be switched on (for example due to a short circuit in the connection to a seat heater element or an interruption in the current supply to the respective control unit, etc.), this will be stored as a malfunction in the vehicle electrical system control module -J519-, in the memory seat/steering column adjustment control module -J136- or in passenger memory seat control module -J521- (depending on the vehicle type and the vehicle equipment level). Currently no information is sent to the Climatronic control module via the data bus system; the DTC memory must be read out in each control unit or in the comfort system central control module -J393- using the Vehicle diagnostic tester in "Guided Fault Finding". In the event of a complaint regarding seat heating or seat ventilation, first check the event memory of the control modules activating the seat heating and seat ventilation.
2. The function test of the heated seats and seat ventilation control is described in the Guided Fault Finding for each control unit (vehicle electrical system control module -J519-, memory seat/steering column adjustment control module -J136- or passenger memory seat control module -J521-, depending on the vehicle version and vehicle equipment). Refer to the Vehicle diagnostic tester in "Guided Fault Finding".
3. If, for example on the vehicle electrical system control module the measured current on terminal "30" falls below the value stored in the vehicle electrical system control module, the heated seat and seat ventilation output will be reduced or switched off completely in order to reduce the load on the generator -C-. Refer to the Vehicle diagnostic tester in "Guided Fault Finding".
4. The measuring value block in the Climatronic control module displays which setting for the seat heating or the seat ventilation has been selected. Depending on the version and equipment level of the vehicle, the seat heating and seat ventilation control, the actual and specified seat temperature, the actual current flowing through the seat heating, etc. will appear in the individual control module (for example, inside measured values block for the vehicle electrical system control module. Refer to the Vehicle diagnostic tester in "Guided Fault Finding".
5. Depending on the vehicle version, the seat heating and ventilation for the front passenger seat can switch off after a certain period of time when it recognizes that the seat is empty. Refer to the Owner's Information.
6. there are different versions of the Climatronic Control Module. The different versions can be recognized, for example, by the symbols on the buttons -A- (for vehicles equipped with "seat heating") and -B- (vehicles with "seat heating / seat ventilation")
7. This illustration shows the Climatronic control module on the "Comfort", as it was installed at the start of production.
8. From MY 12, as a running change (depending on the model and version), a revised Climatronic control module is being installed.
9. If installed, the recognizable differences on the "Comfort" system are: the buttons -C- and rotary pressure adjuster control the seat heating and seat ventilation on the Climatronic control module -A- installed from start of production. Two separate buttons -D- and -E- on the Climatronic control module -B- operate the seat heating and the seat ventilation on vehicles from MY 12 as a running change. Also, the seat heating/seat ventilation on version -B- still have only 3 settings (contrary to the 6 setting on version -A-). A selected seat heating setting will be turned down one setting after a certain amount of time (refer to the Owner's Manual). The location of the buttons -F- and -G- is different between both versions.
10. Both versions -A- and -B- are on the "Basis" when installed. Only the seat heating buttons are different (when installed, there are no noticeable differences on vehicles without seat heating). The seat symbols in the buttons -C- and -D- point in different directions on the Climatronic control module -A- installed from start of production. The seat symbols in buttons -C- and -D- face the same direction the Climatronic control module -B- from MY 12. The version -B- Climatronic control module has 3 seat heating settings (version -A- has 6 settings). The selected seat heating setting will be turned down one setting after a certain period of time (refer to the Owner's Manual).
11. When the seat heating is on, the lamp in the button -A- or -B- "red" turns on and the selected seat heating setting appears in both the Climatronic control module -C- and the MMI display for a certain period of time on a Climatronic control module installed at start of production. On a Climatronic control module installed from MY 12, the selected setting is displayed directly in the button when the lamp turns on. The seat heating and seat ventilation can be used separately on these versions. Refer to the Owner's Manual and Infotainment / MMI Owner's Manual. Climatronic control module allocation
12. The seat heating and ventilation is adjusted by the Climatronic control module; the adjustment is transmitted to the vehicle electrical system control module -J519- via the Data bus. The specified temperatures for the different seat heating and seat ventilation settings are stored in the vehicle electrical system control module. Depending on the version of the vehicle electrical system control module and on the production date of the vehicle, the specified temperature for the seat heating and ventilation can be different with the same setting on the Climatronic control module. Refer to the Vehicle diagnostic tester in "Guided Fault Finding" (for the vehicle electrical system control module -J519-).

Note the following when operating the seat ventilation

1. When the seat ventilation is turned on, the lamp in the button -B- turns on "blue" on a Climatronic control module installed from start of production. The setting for the seat ventilation also appears in the Climatronic control module -C- and in the MMI display for a certain period of time. The selected setting is displayed directly inside the seat ventilation button when the lamp illuminates on a Climatronic control module installed from MY 12. Refer to the Owner's Manual and Infotainment / MMI Owner's Manual.
2. The specified temperature for the seat depends on the seat ventilation setting (approximately 33 °C (91 °F) at setting 1 and approximately 18 °C (64 °F) at setting 6). If the actual temperature in the seat is less than the specified temperature, then the seat heating will be controlled until the specified temperature is reached. Check using the Vehicle diagnostic tester in "Guided Fault Finding" (for example, for the vehicle electrical system control module -J519-).
3. Depending on seat temperature and selected level of seat ventilation, seat heater can be switched on automatically by the control module. If necessary, only seat cushion is heated in seat ventilation mode, seat bolster heating not switched on. Refer to appropriate SYSTEM WIRING DIAGRAM.
4. The blower activation for the seat cushion and seat backrest (2 blowers each in the seat backrest and seat cushion) depends on the seat ventilation setting (approximately 40% of the maximum output at setting 1, and approximately 85% at setting 6). If the temperature of the seat is below 15 °C (59 °F), the fans in the seat will not work. The fans for the seat and the backrest only work when the seat is warmer than 15 °C (59 °F) (the heating element heats the seat when the seat ventilation is on). Refer to the Vehicle diagnostic tester in "Guided Fault Finding" (for example, for the vehicle electrical system control -J519-, the Memory Seat/Steering Column Adjustment Control Module -J136- and the front passenger memory seat control module -J521-, depending on the vehicle) and to «Description and Operation»(/audi/a5/i-2007-2011/remont/seats/#seat-frames-coupe) and «Description and Operation»(/audi/a5/i-2007-2011/remont/seats/#seat-upholstery-covers-coupe) (for the component locations in the seat).
5. The seat heating control depends on the version of the Climatronic control module installed (3 or 6 setting seat heating or seat ventilation) and on the selected seat heating setting and the measured value of the seat temperature sensor (in setting 1 up to approximately 18 °C (64 °F) and in setting 3 or 6 up to approximately 40 / 60 °C) (104 / 140 °F). Refer to the Vehicle diagnostic tester in "Guided Fault Finding" (for example, for the vehicle electrical system control module -J519-, for the Memory Seat/Steering Column Adjustment Control Module and for the Passenger Memory Seat Control Module, depending on the vehicle) and «Description and Operation»(/audi/a5/i-2007-2011/remont/seats/#seat-frames-coupe) and «Description and Operation»(/audi/a5/i-2007-2011/remont/seats/#seat-upholstery-covers-coupe) (for the arrangement of the components in the seat).
6. With seat ventilation mode, seat can be heated up to the following seat temperature, depending on selected level of seat ventilation; also, at a low seat temperature, the output of the blower fan installed in the seat can be reduced. Refer to the Vehicle diagnostic tester in "Guided Fault Finding" (for example, for the vehicle electrical system control module, for the Memory Seat/Steering Column Adjustment Control Module and for the Passenger Memory Seat Control Module, depending on the vehicle).
7. The activation of the seat ventilation is controlled by different control units depending on the vehicle version and equipment level. The Climatronic control module sends the information to the respective control unit (depending on the version of the vehicle and the equipment level) via the data bus system Comfort and via the seat ventilation setting Memory Seat/Steering Column Adjustment Control Module -J136-, the Passenger Memory Seat Control Module -J521- and the Vehicle Electrical System Control Module -J519-). Refer to appropriate SYSTEM WIRING DIAGRAM. The Memory Seat/Steering Column Adjustment Control Module, and the Passenger Memory Seat Control Module directly control, for example, the different blowers installed in the seats. Via a LIN bus, the vehicle electrical system control module first activates the right front seat ventilation control module -J799- and if necessary, the left front seat ventilation control module -J800- (depending on the equipment level); and the right front seat ventilation control module -J799- and the left front seat ventilation control module -J800- then activate, for example, the different blowers installed in the seats. Refer to appropriate SYSTEM WIRING DIAGRAM and the Vehicle diagnostic tester in "Guided Fault Finding" for the Vehicle Electrical System Control Module, for the Memory Seat/Steering Column Adjustment Control Module and for the Passenger Memory Seat Control Module.

AUXILIARY HEATER HEATING ELEMENT -Z35-, TESTING

Note. Currently, certain gasoline engines (for example, vehicles that can use bioethanol "Flex Fuel Vehicle" from MY 10 and on high voltage vehicles) have an electric auxiliary heater. Refer to the Audi Sales Program. The air is supplied with heat energy after leaving the heater core if there is a request from the Climatronic Control module -J255-. The air is supplied with heat energy via the auxiliary heater heating element after it has left the A/C heater core. Vehicles without an auxiliary heater heating element have a honey comb installed inside the A/C System in place of the auxiliary heater heating element -Z35-. Refer to AUXILIARY AIR HEATER HEATING ELEMENT -Z35- / HONEY COMB . The respective engine control module activates the electrical auxiliary heater (the auxiliary heater heating element) (the control modules exchange information about this via the data bus system). Refer to the Vehicle diagnostic tester in "Guided Fault Finding" and appropriate SYSTEM WIRING DIAGRAM. The activation of the electric auxiliary heater (the auxiliary heater heating element) occurs for vehicles with a gasoline engine from the Climatronic control module -J255- control head via the local Data bus (controlled using the same outlet and also using the fresh air blower control module -J126-) on the auxiliary air heater control module -J604-. The auxiliary air heater control module -J604- activates the low heat output relay -J359- and the high heat output relay -J360- and these send the electricity to the auxiliary heater heating element -Z35-. Refer to the Vehicle diagnostic tester in "Guided Fault Finding" and appropriate SYSTEM WIRING DIAGRAM. The request to turn on the electric auxiliary heater being sent to the respective engine control module / auxiliary air heater control module -J604- appears in the measured values block for the Climatronic control module. Refer to the Vehicle diagnostic tester in "Guided Fault Finding". The auxiliary air heater control module -J604- installed on vehicles with a certain gasoline engines is currently not Vehicle Diagnosis, Testing and Information System VAS 5051 in "Guided Fault Finding" diagnostic-capable. Refer to the Vehicle diagnostic tester in "Guided Fault Finding" to verify. The test for the activation of the auxiliary heater heating element is found in Guided Fault Finding for the A/C system. Refer to the Vehicle diagnostic tester in "Guided Fault Finding". In MY 2009, as a running change, a new version of the auxiliary heater heating element is being installed (the heating element is a bit more narrow); be sure to use the correct version and note the allocation. From MY 2010, this vehicle has a Start/Stop System for specific engines as optional equipment. On vehicles with the Start/Stop System. the auxiliary heater heating element is switched off when the Stop function is active (to protect the battery -A-). After the engine is started with the Start function, the auxiliary heater heating element is switched on again. Refer to the Vehicle diagnostic tester in "Guided Fault Finding". Check resistance value of auxiliary heater heating element using the Vehicle diagnostic tester in "Guided Fault Finding".

Auxiliary air heater heating element -Z35- design and functionality

Scheme 289

1. The auxiliary heater heating element is comprised of several layers of resistance elements -E- and -F-. These can achieve a heating output of approximately 1000 W via all 3 -A- through -C-. These resistance elements have a positive temperature coefficient (the resistance increases with the temperature and current pick and the heating output decrease).
2. The resistance heating elements (-E- and -F-) are activated via the cables -A- through -C- ; the current flows through the ground connection -D-.
3. The auxiliary heater heating element is designed so that a current greater the 35 A can flow via the contacts -A- through -C- when switched on. Immediately after switching on, the resistance on the resistance heating elements -E- and -F- increases and the current goes down.
4. To reach the maximum heating output of approximately 1000 W (3 x 333 W), the resistance heating elements temperature must be low and the generator -C- must deliver enough current.
5. Wire -A- provides the voltage to the resistance heating elements -F- via the low heat output relay -J359-. Refer to appropriate SYSTEM WIRING DIAGRAM.
6. Wires -B- and -C- provide the voltage to the resistance heating elements -E- via the high heat output relay -J360-. Refer to appropriate SYSTEM WIRING DIAGRAM.
7. The resistance of the heating elements depends on the temperature; the resistance is approximately 0. 2 to 5 ohms (measured between the connections -A-, -B- and -C- (in the connector) and the ground connection -D

Note. To measure the resistances and to check the activation of the auxiliary heater heating element disconnect the connector on the A/C AUXILIARY AIR HEATER HEATING ELEMENT -Z35- / HONEY COMB Since resistances smaller than 10 ohms cannot be measured with sufficient exactness using workshop tools, a short circuit in the auxiliary heater heating element cannot be determined. Activate the preheating coolant, low heat output relay -J359- and the preheating coolant, high heat output relay -J360- in order to check the function, for example, "control diagnosis" of each engine control module and when doing so, measure the voltages between the contacts in the counter terminal to the terminal on the auxiliary heater heating element and the ground using the Vehicle diagnostic tester in "Guided Fault Finding".

1. The engine control module / auxiliary air heater control module -J604- activates the auxiliary heater heating element in 3 stages. Contacts -A-, -B- and -C- are supplied with voltage as follows. Refer to the wiring diagram appropriate SYSTEM WIRING DIAGRAM.

For stage "1" the voltage from the Preheating Coolant, Low Heat Output Relay -J359- is switched to the contact -A

For stage "2", stage "1" is switched off and the voltage is switched via the Preheating Coolant, High Heat Output Relay -J360- to contacts -B- and -C-.

For stage 3 "3", stage "2" and stage "1" are switched on. Check using the Vehicle diagnostic tester in "Guided Fault Finding".

Note. The control module constantly monitors the generator -C- load. The next stage is selected if the load remains under a certain limit. If the load exceeds a specified limit, then the stage is switched down.

Switch-on criteria for electric auxiliary heater activation

Note. The switch on conditions in the Climatronic control module must be met so that the request can be sent to the respective engine control module.

The Climatronic control module sends a request to switch on the auxiliary heater to the engine control module as long as the following requirements are fulfilled

1. Engine is running for a minimum of 8 seconds and engine speed is greater than 500 RPM.
2. Engine temperature is less than 75 °C (167 °F).
3. The calculated outside air temperature is lower than 8 °C (46 °F).
4. Vehicle voltage supply is greater than 12.2 volts and no request that forbids the switch-on is sent by Vehicle Electrical System Control Module -J519-.
5. No DTCs are stored in Climatronic control module.
6. No DTC is stored in Engine Control Module (ECM) and Generator (GEN) -C- load is less than 30 to 77% (depending on engine speed).
7. Based on the setting and the measured temperatures, the Climatronic control module has calculated that additional heat output is necessary to reach the intended passenger compartment temperature.
8. The Climatronic control module has calculated that more than 90% of the air will be guided through the heater core.

Note. The engine control module / auxiliary air heater control module -J604- activates the auxiliary heater heating element (3-stage) via both auxiliary heating relays (low heat output relay -J359- and preheating coolant, high heat output relay -J360-), so that the load on the generator -C- does not exceed 95%. Refer to the Vehicle diagnostic tester in "Guided Fault Finding" for the A/C control module and to appropriate SYSTEM WIRING DIAGRAM. Thus the next stage is switched on only in the event generator load is less than 30 to 77%, depending on engine speed.

Switch-off criteria for electric auxiliary heater activation

Note. The activation is switched off as soon as a switch on requirement is no longer filled in the Climatronic control module or respective engine control module or one of the switch off criteria has been detected.

The Climatronic control module switches off the request to switch on the electrical auxiliary heater.

1. When one of the switch-on requirements is no longer met.
2. The calculated outside air temperature is higher than 11 °C (52 °F).
3. Generator load is greater than 95%.
4. The Climatronic control module has calculated that less than 60% of the air will be guided through the heater core (position of temperature doors)

TESTING OF COMPONENTS FOR THE A/C SYSTEM FOR VEHICLES WITH HIGH VOLTAGE SYSTEM

Hybrid vehicles

1. Components for the A/C system (and the refrigerant circuit) which are the same for vehicles with and without a high voltage system, can be tested, removed, and installed as described for vehicles without the high voltage system (for example, A/C system motor). Refer to the Vehicle diagnostic tester in "Guided Fault Finding" (A/C system).
2. A/C system components, which are almost identical on vehicles with and without the high voltage system, but can, for example, be differentiated by their function, are tested, removed and installed in the same way as described as for vehicles without the high voltage system (for example, the Climatronic control module -J255-). Refer to Vehicle diagnostic tester in "Guided Fault Finding" (A/C system).
3. Components that are different for the A/C system (and the refrigerant circuit) for vehicles with and without a high voltage system (for example, the electric A/C compressor -V470- and the A/C compressor control module -J842-) are tested, removed, and installed as described for the vehicles with the high voltage system (for example, the A/C compressor control module -J842- with address word "40". Refer to the Vehicle diagnostic tester in "Guided Fault Finding"). The A/C compressor control module (and also the electric A/C compressor) are supplied electricity from the electric drive power and control electronics -JX1-. Check the electric drive power and control electronics (address word "51") if there is a complaint. Refer to the Vehicle diagnostic tester in "Guided Fault Finding" and to the appropriate SYSTEM WIRING DIAGRAM.
4. Components for the A/C system (and the refrigerant circuit) which are only equipped for vehicles with a high voltage system (for example, the electric components for the battery cooler module, the refrigerant cut-off valve 1 for the hybrid-battery -N516-, the refrigerant cut-off valve 2 for the hybrid-battery -N517- etc.) are installed and removed as described for vehicles with a high voltage system. These components are not directly controlled from the Climatronic control module. The battery regulation control module -J840- controls these components (address word "8C"). Refer to the Vehicle diagnostic tester in "Guided Fault Finding" and to the appropriate SYSTEM WIRING DIAGRAM.

Read and follow all of the supplemental warnings for all work performed on vehicles with the high voltage system, refer to HIGH VOLTAGE SYSTEM (HYBRID VEHICLES) REPAIRS .

Charge the vehicle battery using the VAS 5903 in the battery support mode to minimize the number of automatic starts during the test- and measuring procedures while the ready mode is active. Refer to [For engine(s) CAUA, CAEB, CALA] General Information .

Activate ready mode (with the ignition turned on, observe the display in the instrument cluster control module -J285-).

Note. The ready mode is displayed in the instrument cluster control module above the "powermeter". Activate the ready mode (and observe the display in the instrument cluster control module). Refer to the Owners Manual. Also move the selector lever into position "P" and activate the parking brake for testing and measuring procedures which require the ignition to be on, but do not require the ready mode to be active.

A/C PRESSURE/TEMPERATURE SENSOR -G395-, CHECKING PRESSURE SIGNAL

Note. The coolant performance cannot be checked when the A/C pressure/temperature sensor is removed, the Climatronic control module -J255- does not switch on the A/C compressor. Check using the Vehicle diagnostic tester in "Guided Fault Finding". Check the refrigerant pressure sensor and the refrigerant temperature measured values using the Vehicle diagnostic tester in "Guided Fault Finding". The A/C pressure/temperature sensor exchanges information with the vehicle electrical system control module -J519- via a local Data bus. The vehicle electrical system control module transmits the data via the Data bus to the Climatronic control module. The temperature measured by the A/C pressure/temperature sensor differs from the actual refrigerant temperature because of the A/C pressure/temperature sensor design and its component location. Because of this, it is not currently evaluated and is not used to regulate the A/C system. Only A/C pressure/temperature sensor may be installed for this vehicle. After switching off the A/C compressor on this vehicle, it may take a long time until the pressure on the high pressure side (the expansion valve is "cold" and the pressure on the low pressure side increases quickly after switching off, the expansion valve closes and the refrigerant can flow slowly on the low pressure side.

Preparation

Turn off the ignition.

Remove the upper cover on the lock carrier cover. Refer to Removal and Installation .

Disconnect the electrical connector -A-.

Scheme 290

Routing for the 3-pin connector on the A/C pressure/temperature sensor -A-.

1. Ground
2. Signal output - via the local Data bus to the vehicle electrical system control module -J519
3. Terminal "75" (positive)

Test sequence

Switch on the ignition.

Check the ground and positive connection to the terminal -A-.

Check the connection and the function of the A/C pressure/temperature sensor as described in the Vehicle diagnostic tester in "Guided Fault Finding".

Note. The A/C compressor (A/C compressor regulator valve -N280-) is not actuated when the connector -A- is disconnected. The A/C pressure/temperature sensor is an electronic control module over which a local Data bus exchanges information with the vehicle electrical system control module -J519-. Refer to the Vehicle diagnostic tester in "Guided Fault Finding".

A/C COMPRESSOR REGULATOR VALVE -N280-, CHECKING SWITCH-ON SIGNAL

Note. The test for an A/C compressor manufactured by "Denso" of type "6 SEU 14" is described in the following. Test is to be performed in the same way for vehicles with a different compressor type or a different manufacturer. The following describes checking a vehicle with a 6 cylinder TDI engine; the procedure can vary on vehicles with a different engine (4, 6 or 8 cylinder engine). Not installed on an electric A/C compressor; refer to ELECTRIC A/C COMPRESSOR REMOVING FROM BRACKET .

Preparation

Turn off the ignition.

Remove front noise insulation. Refer to Removal and Installation .

Test Sequence

Disconnect electrical connector -B- on A/C compressor regulator valve -A-.

Scheme 291

Using an adapter cable from the connector test kit V.A.G 1594 C recreate the connection between terminal -A- and terminal -B- on the A/C compressor regulator valve.

Note. The A/C compressor regulator valve is controlled by the vehicle electrical system control module -J519- requested by the Climatronic control module -J255-. Check via the Vehicle diagnostic tester in "Guided Fault Finding" and appropriate SYSTEM WIRING DIAGRAM. The above illustration shows a A/C compressor where the connector -A- leading to the vehicle wiring harness is directly connected on the A/C compressor regulator valve (connector -B-). Depending on the version of the A/C compressor, the connector -B- may also have a short wire. The A/C compressor regulator valve control is displayed in the vehicle electrical system control module -J519- measured values block. The maximum control current depends on the version of the Climatronic control module. Refer to the Vehicle diagnostic tester in "Guided Fault Finding" and appropriate SYSTEM WIRING DIAGRAM. The measured current, that flows through the A/C compressor regulator valve, is displayed in the Climatronic control module measured values block and in the vehicle electrical system control module -J519- measured values block. Refer to the Vehicle diagnostic tester in "Guided Fault Finding". If the required actual current is not flowing through the A/C compressor regulator valve check Vehicle Electrical System Control Module -J519- positive and ground connections and the wire connections between the Vehicle Electrical System Control Module and the A/C Compressor Regulator Valve for short circuit, contact resistance and interchanged wires according to the wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAM. An adapter cable can also be used for this test. To do this, use one connector each -A- and -B- (part number 1J0 973 702 and 1J0 973 802 and related terminal contacts), two standard sockets for banana connectors -C- and two wires with 0.5 mm 2 diameter.

Connect the DSO Measuring Lead 1 & 2 VAS 5051/8 to the adapter cables.

Measuring lead (signal wire) to terminal -2- of connector -B

Measuring lead (shielding, Ground) to terminal -1- of connector -B

In Vehicle Diagnostic Tester select operating mode Test Instruments: DSO (Digital Storage Oscilloscope)

Select 5 V/Div = 0.5 ms/Div (5 volts DC and 0.5 milliseconds per unit)

Start the engine.

Adjust the temperature preset to maximum cooling on the Climatronic control module.

Switch the A/C compressor regulator valve activation on and off by pressing the "AC" button (with an indicator lamp when the A/C compressor is on) on the Climatronic control module.

Shown on screen of oscilloscope, depending on setting of Climatronic control module

In operating mode "OFF" or "AC off" (indicator light in "AC" button does not come on), no square wave signal (the A/C compressor regulator valve is not activated).

In operating mode "Auto" and "AC on" (indicator lamps in buttons come on) and temperature preselect for maximum cooling output, a square wave signal with an impulse width -A- between 75% and 100% (the control valve is activated).

Scheme 292

Note. The Fig. shows a signal with a duty cycle of approximately 80 %. The impulse width -A- is dependent upon the desired cooling output, vehicle voltage, etc. (over the width of region -A-, the voltage is regulated via the A/C compressor regulator valve from the vehicle electrical system control module -J519- based on the request from the Climatronic control module). The signal distance -B- is always 2 milliseconds (corresponds to frequency of 500 Hertz). The duty cycle is determined by the ratio of impulse width -A- and signal distance -B-.

The impulse width of the square-wave signal changes depending on the Climatronic control module setting and the environmental conditions (duty cycle between 100% and larger than 30%, the A/C compressor regulator valve is activated so the compressor output necessary to reach the specified temperatures is achieved).

Note. Whenever the mode is adjusted to "Auto", and "AC On" (the indicator lamps on the buttons light up), and the temperature preset is set to stop "Lo", then the A/C compressor regulator valve is activated so that the maximum permissible current of approximately 0.65 A flows through the A/C compressor regulator valve (maximum A/C compressor output). In control mode, actuation time is governed by required cooling output and vehicle electrical system voltage, for example. It is however always of sufficient duration to achieve a mean current of 0.3 A.

1. A/C compressor regulator valve, Checking, refer to «A/C COMPRESSOR REGULATOR VALVE -N280-, CHECKING ACTIVATION»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__ac-compressor-regulator-valve-n280-checking) .

A/C COMPRESSOR REGULATOR VALVE -N280-, CHECKING ACTIVATION

Note. Perform an electrical test on the A/C compressor regulator valve as described in Guided Fault Finding for the A/C system using the Vehicle diagnostic tester in "Guided Fault Finding". The vehicle electrical system control module -J519- actuates the A/C compressor regulator valve. The request to activate the A/C compressor regulator valve and the necessary current to regulate compressor output to reach the desired temperature at the evaporator. Sent to the vehicle electrical system control module via the Climatronic control module data bus. The vehicle electrical system control module then activates the A/C compressor regulator valve. If a fault in the A/C compressor regulator valve is detected, then it will be stored in the vehicle electrical system control module -J519- DTC memory and in the Climatronic control module. It will be necessary to the check the vehicle electrical system control module DTC memory when reading the Climatronic control module DTC memory. Refer to the Vehicle diagnostic tester in "Guided Fault Finding". The A/C compressor regulator valve actuation is displayed in the vehicle electrical system control module measured values block. Refer to the Vehicle diagnostic tester in "Guided Fault Finding".

A/C COMPRESSOR BELT PULLEY AND CLUTCH PLATE GAP, CHECKING

Note. The gap dimension must be within the permissible range over the entire circumference. Gap dimension may also be measured with A/C compressor installed. If the gap dimension is outside of the permissible range, first remove the clutch plate and then remove or insert spacers to get to attain the correct dimension.

Turn off the ignition.

Perform the preliminary work as for replacing the belt pulley. Refer to A/C COMPRESSOR BELT PULLEY .

Scheme 293

1. Tighten the clutch plate -C- on the A/C compressor shaft -E- to 30 Nm.

Measure the dimension "1" between the belt pulley -B- and the clutch plate -C- with a depth gauge -F- at 3 places on the clutch plate -C- circumference and then write down the measured values.

Apply 12 volts to the 1-pin connector -A-.

Connect the ground to the compressor housing -D-.

Measure the dimension "2" between the belt pulley -B- and the clutch plate -C- with a depth gauge -F- at 3 places on the clutch plate -C- circumference and then write down the measured values.

Calculate the gap dimension using dimensions "1" and "2".

Gap dimension specified value: 0.4 to 0.6 mm (up to 0.8 mm on an A/C clutch already used).

Special tools and workshop equipment required

1. Battery charger, 60A VAS 5903
2. A standard thermometer (for temperature measurements, if necessary a thermometer with 2 measuring probes for simultaneous measurement e.g. for temperature on the right and left)

With high voltage systems (hybrid vehicles)

Read and follow all of the supplemental warnings for all work performed on vehicles with the high voltage system, refer to HIGH VOLTAGE SYSTEM (HYBRID VEHICLES) REPAIRS .

If it is necessary for the following procedure to perform work in the vicinity of high voltage components, perform a visual inspection of the high voltage components and cables for damages, refer to VISUAL INSPECTION OF HIGH-VOLTAGE COMPONENTS AND CABLES FOR DAMAGE and always follow the warnings when working on the high voltage system. Refer to HIGH VOLTAGE SYSTEM (HYBRID VEHICLES) REPAIRS .

Working on a high voltage system when activated or with the ignition turned on

Charge the vehicle battery using the VAS 5903 in the battery support mode to minimize the number of automatic starts during the test- and measuring procedures while the ready mode is active. Refer to General Information

Move the selector level into position "P", activate the parking brake and arrange the necessary tools for testing and measuring procedures that require the ready mode to be active or that require the ignition to be on, so that they cannot come into contact with the turning components in the engine and so that they are not in the vicinity of the turning components of a running engine.

Note. Also move the selector lever into position "P" and activate the parking brake for testing and measuring procedures which require the ignition to be on, but do not require the ready mode to be active. The ready mode is displayed in the instrument cluster control module -J285- above the "powermeter". Refer to the Owner's Manual. Activate and deactivate the ready mode. Refer to the Owner's Manual (consult the display in the instrument cluster control module).

Note. If the ignition is turned on and the ready mode is active, the engine runs or starts only, when heated coolant is necessary to reach the temperature setting in the vehicle interior or for example the traction battery -A2- (hybrid battery) has not been charged enough. The coolant flow through is maintained by the heater core for the A/C system via the coolant pump -V50- when the ignition is turned on and the drive ready mode is active (the engine is not running). Refer to [For engine(s) CAUA] Description and Operation or to [For engine(s) CAEB] Description and Operation or to [For engine(s) CALA] Description and Operation . The activation of the coolant recirculation pump occurs, depending on the version of the vehicle, directly from the Climatronic control module -J255- or at the request of the Climatronic control module from the corresponding engine control module. Refer to appropriate SYSTEM WIRING DIAGRAM.

Activate the ready mode (observe the display in the instrument cluster control module -J285-). Refer to the Owner's Manual.

All vehicles

If coolant circuit is not completely bled after filling, air may accumulate in heater core of A/C unit, thus reducing heating performance of A/C system, additional noises may occur or customer may complain of different air temperatures flowing out of vents at driver's side and front passenger's side at the same setting.

Corrective action

Perform a longer road test at a higher engine RPM with the setting "A/C system maximum heating output" (at least for 10 minutes, engine RPM higher than 2, 500). Select a low gear during the test to prevent excessive vehicle speed.

If customer complains of poor heating performance at specific engine speeds, check incorporation of heater core in A/C system in the coolant circuit. If both coolant hoses (supply and return) of engine are interchanged, coolant is flowing in the wrong direction through the heater core. Refer to [For engine(s) CAUA] Description and Operation or to [For engine(s) CAEB] Description and Operation or to [For engine(s) CALA] Description and Operation .

If a different air temperature is coming out of the vents during A/C system control mode, it may be caused by the following.

1. One or more of the temperature doors in the heater core housing do not close completely or do not reach their end position.
2. There is air in the heater core (fluctuating flow through heater core and heat is not distributed uniformly).
3. A foam seal has loosened during installation of heater core and air may flow past at heater core. Refer to «HEATER CORE/HOUSINGS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) .
4. If, when installing the auxiliary air heater heating element -Z35- / honey comb, a foam seal has come loose, air can flow out where the seal has separated. Refer to «AUXILIARY AIR HEATER HEATING ELEMENT -Z35- / HONEY COMB»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__auxiliary-air-heater-heating-element-z35) .
5. The A/C system refrigerant circuit is not filled with the correct quantity of refrigerant (perform a cooling performance test). Refer to «A/C COOLING OUTPUT, CHECKING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2) .

Note. From MY 2010, this vehicle has a Start/Stop System for specific engines as optional equipment. The setting on the Climatronic control module -J255- can prevent the Stop function. If, for example, "defrost" is selected, the stop function is not possible or will be interrupted and the engine will start. The same applies in the case of heating and cooling. The difference between the selected and actual temperature is greater than a specified value. Refer to the Vehicle diagnostic tester in "Guided Fault Finding". Vehicles with the Start/Stop System have an additional coolant pump -V50- (water pump -V36-) for the start/stop function, refer to COOLANT PUMP ; refer to [For engine(s) CAUA] Description and Operation or to [For engine(s) CAEB] Description and Operation or to [For engine(s) CALA] Description and Operation and the Vehicle diagnostic tester in "Guided Fault Finding". The coolant pump (water pump) is controlled not only when the "Start/Stop System" is on, but also when the engine is running and when the temperature is set to "warm" on the Climatronic control module ("HI" appears in the display on the A/C control head and in the MMI). The coolant pump (water pump is activated to support the engine coolant pump. Refer to the Vehicle diagnostic tester in "Guided Fault Finding". The coolant pump (water pump) versions and activation differ depending on the version of the vehicle and production period. From MY 12 beginning with start of production, pumps that were controlled by a 500 Hertz signal (500 pulses per second) are being replaced by pumps that are controlled by a 100 Hertz signal depending on the engine. Pumps, controlled by a 100 Hertz signal, also have a diagnostic function and are controlled by the engine control module. Check for the correct allocation; refer to the Vehicle diagnostic tester in "Guided Fault Finding", to the appropriate SYSTEM WIRING DIAGRAM.

The actuation of the temperature doors differs between the "Basis" A/C system and the "Comfort" A/C system Refer to HEATER CORE HOUSING TEMPERATURE DOORS

On the "Comfort" A/C system, the right font temperature door is actuated by the Right Temperature door Motor -V159- and left front temperature door by the Left Temperature door Motor -V158-. Both temperature doors for the rear right footwell vent and the rear left footwell vent, as well as the vent in the rear center console are connected by a connector rod; they are actuated by the Rear Temperature door Motor -V137

On the "Basis" A/C system, the upper and lower temperature flaps (for the front right vents and the right footwell vents) as well as the upper and lower temperature flaps (for the front left vents and the left footwell vents) are connected to each other by the shafts. The right and left temperature door shafts are connected to each other by a connector rod; they are both actuated by the Temperature Regulator door Motor -V68-.

1. Heating output and temperature door activation, testing requirements, refer to «HEATING OUTPUT AND TEMPERATURE DOOR ACTIVATION, TESTING REQUIREMENTS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__heating-output-and-temperature-door-activation) .
2. Heat output and temperature door activation, checking, refer to Basis «HEATING OUTPUT AND TEMPERATURE DOOR ACTIVATION, CHECKING, BASIS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__heating-output-and-temperature-door-activation) or Comfort «HEAT OUTPUT AND TEMPERATURE DOOR ACTIVATION, CHECKING, COMFORT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__heat-output-and-temperature-door-activation) .

HEATING OUTPUT AND TEMPERATURE DOOR ACTIVATION, TESTING REQUIREMENTS

With high voltage systems (hybrid vehicles)

Read and follow all of the supplemental warnings for all work performed on vehicles with the high voltage system, refer to HIGH VOLTAGE SYSTEM (HYBRID VEHICLES) REPAIRS .

If it is necessary for the following procedure to perform work in the vicinity of high voltage components, perform a visual inspection of the high voltage components and cables for damages, refer to VISUAL INSPECTION OF HIGH-VOLTAGE COMPONENTS AND CABLES FOR DAMAGE and always follow the warnings when working on the high voltage system. Refer to HIGH VOLTAGE SYSTEM (HYBRID VEHICLES) REPAIRS .

Working on a high voltage system when activated or with the ignition turned on

Charge the vehicle battery using the VAS 5903 in the battery support mode to minimize the number of automatic starts during the test- and measuring procedures while the ready mode is active. Refer to General Information

Move the selector level into position "P", activate the parking brake and arrange the necessary tools for testing and measuring procedures that require the ready mode to be active or that require the ignition to be on, so that they cannot come into contact with the turning components in the engine and so that they are not in the vicinity of the turning components of a running engine.

Note. Also move the selector lever into position "P" and activate the parking brake for testing and measuring procedures which require the ignition to be on, but do not require the ready mode to be active. The ready mode is displayed in the instrument cluster control module -J285- above the "powermeter". Refer to the Owner's Manual. Activate and deactivate the ready mode. Refer to the Owner's Manual (consult the display in the instrument cluster control module).

All vehicles

Note. From 01.2008, A/C units which have an additional connection for the glove compartment cooling are being installed. On vehicles without glove compartment cooling, this connection is sealed with a plug. Refer to GLOVE COMPARTMENT COOLING TO AIR INTAKE MANIFOLD CONNECTION . If the plug or the air guide are not installed correctly, then cold air will be guided into the passenger footwell and the customer will complain about poor heating performance on the passenger side.

1. Coolant circuit has been bled according to specifications. Refer to «[For engine(s) CAUA] General Information»(ref-520122-S09688826772012123100000) or to «[For engine(s) CAEB] General Information»(ref-520126-S21222093122012123100000) or to «[For engine(s) CALA] General Information»(/audi/a5/i-2007-2011/remont/cooling-fan/#32l-cooling-system-engine-codes-cala-coupe-as-of-122008)
2. The engine is warm (the coolant temperature is higher than 80 °C (176 °F)).
3. Radiator and condenser are clean (if necessary clean)
4. All air ducts, covers and seals OK and properly installed
5. Air flow through dust and pollen filter not obstructed by dirt. Refer to «DUST AND POLLEN FILTER»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__dust-and-pollen-filter) .
6. Air intake apparatus (in fresh air and recirculating air mode) is not impaired by soiling or components installed as retrofit.
7. The glove compartment cooling connection is sealed with a plug (on vehicles without the option "glove compartment cooling") or the air guide into the glove compartment is installed to specification (on vehicles with the option "glove compartment cooling"). Refer to «GLOVE COMPARTMENT COOLING TO AIR INTAKE MANIFOLD CONNECTION»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__glove-compartment-cooling-to-air-intake) .
8. Vehicle not exposed to sunlight
9. Climatronic Control Module -J255- DTC memory was checked and erased, basic setting was performed and the Climatronic control module. coding was checked using the Vehicle diagnostic tester in "Guided Fault Finding".
10. The Climatronic Control Module adaptation was checked using the Vehicle diagnostic tester in "Guided Fault Finding".
11. All instrument panel vents open
12. The hood is closed.

With high voltage systems (hybrid vehicles)

1. The ignition is turned on and the ready mode is active, the engine runs or starts only, when heated refrigerant is necessary to reach the temperature setting in the vehicle interior or for example the traction battery -A2- (hybrid battery) has not been charged enough.
2. With the ignition turned on and the temperature preselect "warm" on the Climatronic control module ("HI" in the display and control head and in the MMI display).

For vehicles without a high voltage system

1. The engine is running.
2. With the engine running and the temperature preselect "warm" on the Climatronic control module ("HI" in the display and control head and in the MMI display).

All vehicles

1. When the engine is running (ready mode is active for vehicles with a high voltage system) and the temperature preset is set to "warm" on the Climatronic control module (display "HI" in the display for the A/C system control head and the Multi Media Interface).

This is not activated on vehicles with a climatronic refrigerant shut-off valve -N422- / coolant shut-off valve -N82- (not installed on all vehicles). Refer to COOLANT RECIRCULATION PUMP -V50- (WATER PUMP -V36-) .

This is actuated on vehicles with a coolant pump (water pump) (not on all vehicles, installed, for example, on the 6 cylinder FSI vehicles and on vehicles having the Start/Stop System but without an "auxiliary heater" and on high voltage vehicles) Refer to COOLANT PUMP .

Set the "Basis" Climatronic control module as follows

1. "Auto" operating mode (indicator light on the AUTO button lights up).
2. Temperature preselect "cold" (display "LO" in the MMI display).
3. The A/C compressor is on (the indicator lamp on the AC button comes on).
4. Preselect for the fresh air blower "maximum speed" (in the Multi Media Interface display, level "10" or greater).

The "Comfort" Climatronic Control Module is set as follows

1. "Auto" mode (the indicator lamp in both AUTO buttons illuminate).
2. Temperature preselect "cold" for the driver's and passenger's side (display "LO" for the driver's and passenger's side in the A/C Control Head display and in the Multi Media Interface display).
3. The A/C compressor is on (the indicator lamp on the AC button comes on).
4. Preselect for the fresh air blower "maximum speed" (display in the A/C Control Head and in the Multi Media Interface display, level "10" or greater).

Note. The indicator lamp in the or both AUTO button(s) goes out when the fresh air blower speed is changed manually. The maximum possible fresh air blower speed depends on several conditions (coolant temperature, vehicle voltage, etc.)

On vehicles equipped with the "Comfort" A/C system, the Rear Temperature Selection Potentiometer -G538- is set to "cold" (installed in the rear center console vent).

On vehicles equipped with the "Comfort" A/C system, the vent the rear center console is open.

The activation and function of the auxiliary heater is OK on vehicles with a gasoline engine with an auxiliary heater.

Note. Check the activation and function of the auxiliary heater on vehicles with an auxiliary air heater heating element -Z35- if the complaint is that the heating output is insufficient when the outside air temperatures are low. Refer to AUXILIARY HEATER HEATING ELEMENT -Z35-, TESTING . As a running change in MY 10, gasoline engines that can run on bioethanol (Flex Fuel Vehicles) were introduced, which currently have an auxiliary heater heating element. Refer to AUXILIARY HEATER HEATING ELEMENT -Z35-, TESTING . Currently an auxiliary air heater heating element is installed for vehicles with a high voltage system (hybrid vehicles) and a gasoline engine AUXILIARY HEATER HEATING ELEMENT -Z35-, TESTING .

Functions when the engine is running (non hybrid vehicles) / drive ready mode activated (hybrid vehicles)

Note. For vehicles with the high voltage system (hybrid vehicles) and for vehicles with the start stop system, the engine only runs potentially when an additional heat output is needed to reach the set temperature.

The coolant fan (coolant fan -V7- and coolant fan 2 -V177-) run (activation and speed depend on pressure in coolant circuit and engine temperature).

Note. Depending on the version of the Climatronic control module, the coolant fan and coolant fan 2 are only switched on at a certain pressure in the coolant circuit (currently, at a pressure of approximately 9 bar (130 psi)). The coolant fan(s) control is displayed in the measured values block. Refer to the Vehicle diagnostic tester in "Guided Fault Finding".

The Fresh Air Blower -V2- runs with maximum speed ("10" or greater).

Note. The maximum possible fresh air blower speed depends on several conditions (coolant temperature, vehicle voltage, etc.)

The A/C goes into recirculating air mode for approximately 1 minute after starting the engine (after activating the ready mode on high voltage vehicles) the back pressure/fresh air door is closed and the recirculation door is opened, fresh air door -V2- extracts the air from passenger compartment below instrument panel / glove compartment.

Note. If one of these requirements is not filled, check the DTC memory, perform output diagnostic test mode and read the measured values block using the Vehicle diagnostic tester in "Guided Fault Finding".

If the above mentioned requirements are fulfilled

1. Check the heating output and temperature door activation (on the "Basis" A/C system). Refer to «HEATING OUTPUT AND TEMPERATURE DOOR ACTIVATION, CHECKING, BASIS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__heating-output-and-temperature-door-activation) .
2. Check the heating output and temperature door activation (on the "Comfort" A/C system). Refer to «HEAT OUTPUT AND TEMPERATURE DOOR ACTIVATION, CHECKING, COMFORT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__heat-output-and-temperature-door-activation) .

HEATING OUTPUT AND TEMPERATURE DOOR ACTIVATION, CHECKING, BASIS

Test requirements are met, refer to HEATING OUTPUT AND TEMPERATURE DOOR ACTIVATION, TESTING REQUIREMENTS .

Close the engine hood.

Close the doors, the windows, the sunroof and the rear lid.

Open all instrument panel vents.

Turn on the ignition and activate the ready mode, the engine start by itself if needed (high voltage vehicles).

Start the engine (not high voltage vehicles).

Set the Climatronic control module -J255- as follows

1. "Auto" operating mode (indicator light on the AUTO button lights up).
2. Temperature preselect "cold" (display "LO" in the MMI display).
3. The A/C compressor is on (the indicator lamp on the AC button comes on).
4. Preselect for the fresh air blower "maximum speed" (in the MMI display, level "10" or greater).
5. Set the vent direction using the rotary switch on the A/C Control Head to "footwell vents" and "instrument panel vents" (displayed in the Multi Media Interface display).

Note. The indicator lamp in the AUTO button goes out when the vent direction for the air or fresh air blower speed is manually changed. The maximum possible fresh air blower speed depends on several conditions (coolant temperature, vehicle voltage, etc.)

Perform Guided Fault Finding on A/C system and select the "Read measuring value block" function using the Vehicle diagnostic tester in "Guided Fault Finding".

Let the A/C run a few minutes with maximum cooling output (A/C compressor is switched on, indicator lamp in the AC button comes on).

Compare the evaporator vent temperature sensor -G263- measured value to the measured values from the center outlet temperature sensor -G191- and the footwell vent temperature sensor -G192-).

Target values

1. The center outlet temperature sensor -G191- and footwell outlet temperature sensor -G192- measured values may not be greater than maximum 5 °C (41 °F) after 5 minutes, than the evaporator vent temperature sensor -G263- measured value.

If the required values are not reached, perform a Fault Finding at a temperature increase on the evaporator HEATING OUTPUT AND TEMPERATURE DOOR ACTIVATION, CHECKING, BASIS => Temperature Increase Downstream from Evaporator, Determining Malfunction

Using a commercially available thermometer, measure the air temperature coming out of the instrument panel vents (left, right and center) and out of the front and rear footwells and compare the measured values with displayed measured values from the center outlet temperature sensor and the footwell outlet temperature sensor.

Target values

1. The measured values with the thermometer may be maximum 5 °C (41 °F) lower or higher than the measured values from the center outlet temperature sensor and the footwell outlet temperature sensor.

If the required values are not reached, perform a fault finding at a temperature increase on the evaporator HEATING OUTPUT AND TEMPERATURE DOOR ACTIVATION, CHECKING, BASIS => Temperature Increase Downstream from Evaporator, Determining Malfunction

Using the dial on the Climatronic control module, select the "Warm" ("Hi" in the MMI display).

Using a commercially available thermometer, measure the air temperature coming out of the instrument panel vents (left, right and center) and out of the front and rear footwells and compare the measured values with displayed measured values from the center outlet temperature sensor and the footwell outlet temperature sensor.

Target values

1. The measured values from the center outlet temperature sensor and the footwell outlet temperature sensor in the display fields are greater than 52 °C (125 °F) (depending on the engine temperature at the time).
2. The measured values (temperature of the air coming out of the vents), after 5 minutes, may be maximum 5 °C (41 °F) greater or smaller than the measured values from the center outlet temperature sensor and the footwell outlet temperature sensor.

Note. Depending on the engine, for example, on the 8 cylinder engine, it may be necessary to increase the engine from 1, 200 to 1, 500 to reach the required temperature. The heating performance of the engine or coolant flowing through the heater core may not be sufficient when the engine is running in idle to bring the necessary warming energy into the heater core (for example, on an 8 cylinder engine with an idle RPM of approximately 650). At the setting "Warm" the specified outflow temperature on the evaporator is controlled to approximately 10 °C (50 °F) by the Climatronic control module. On high voltage vehicles, lower the fresh air blower -V2- speed. The coolant pump -V50- delivery is not always enough to supply the required heat output when the engine is running and the fresh air blower is set to the highest setting.

If the specified values are not reached, check the following

1. Repeat the heating output at an engine RPM of approximately 1, 500 to 2, 000 (at a low fresh air blower speed on high voltage vehicles). If the heating performance is not reached at the engine RPM (fresh air blower speed), the fault is not with the A/C unit but rather inside the coolant circuit (a combination of the A/C system in the coolant circuit, engine coolant pump delivery, the coolant flowing through the heater core, etc. Refer to «HEATER CORE/HOUSINGS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) and «[For engine(s) CAUA] Description and Operation»(ref-520122-S38578899852012123100000) or to «[For engine(s) CAEB] Description and Operation»(ref-520126-S15924086162012123100000) or to «[For engine(s) CALA] Description and Operation»(/audi/a5/i-2007-2011/remont/cooling-fan/#32l-cooling-system-engine-codes-cala-coupe-as-of-122008) ).
2. Ventilation of coolant circuit, refer to «[For engine(s) CAUA] General Information»(ref-520122-S09688826772012123100000) or to «[For engine(s) CAEB] General Information»(ref-520126-S21222093122012123100000) or to «[For engine(s) CALA] General Information»(/audi/a5/i-2007-2011/remont/cooling-fan/#32l-cooling-system-engine-codes-cala-coupe-as-of-122008) .
3. The integration of the heater core in the coolant circuit, refer to «[For engine(s) CAUA] Description and Operation»(ref-520122-S38578899852012123100000) or to «[For engine(s) CAEB] Description and Operation»(ref-520126-S15924086162012123100000) or to «[For engine(s) CALA] Description and Operation»(/audi/a5/i-2007-2011/remont/cooling-fan/#32l-cooling-system-engine-codes-cala-coupe-as-of-122008) .
4. Actuation and function of the temperature regulator door motor -V68- and the actuation of the temperature door (via the connecting rod), refer to «HEATER CORE HOUSING TEMPERATURE DOORS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__heater-core-housing-temperature-doors) , «TEMPERATURE REGULATOR DOOR MOTOR -V68- AND REAR TEMPERATURE DOOR MOTOR -V137»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__temperature-regulator-door-motor-v68-and) and the Vehicle diagnostic tester in "Guided Fault Finding".
5. Foam seal on heater core for heater of A/C unit, refer to «HEATER CORE REMOVING AND INSTALLING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__heater-core-removing-and-installing) .
6. Coolant regulator (engine coolant may not warm properly if regulator is malfunctioning), refer to «[For engine(s) CAUA] Description and Operation»(ref-520122-S38578899852012123100000) or to «[For engine(s) CAEB] Description and Operation»(ref-520126-S15924086162012123100000) or to «[For engine(s) CALA] Description and Operation»(/audi/a5/i-2007-2011/remont/cooling-fan/#32l-cooling-system-engine-codes-cala-coupe-as-of-122008) .
7. Check the engine coolant pump for correct function (if the coolant pump is defective, it is possible that not enough coolant is flowing through the heater core for heating in the A/C unit). Refer to «[For engine(s) CAUA] Description and Operation»(ref-520122-S38578899852012123100000) or to «[For engine(s) CAEB] Description and Operation»(ref-520126-S15924086162012123100000) or to «[For engine(s) CALA] Description and Operation»(/audi/a5/i-2007-2011/remont/cooling-fan/#32l-cooling-system-engine-codes-cala-coupe-as-of-122008) .
8. Coolant pump -V50- activation and function (if the coolant pump is faulty, then not enough coolant is flowing through the heater core in the air conditioner for heating). Refer to the Vehicle diagnostic tester in "Guided Fault Finding".

Note. The coolant pump -V50- maintains the coolant flow through the heater core heater in the A/C system when the engine is not running for vehicles with a start-stop system and for high voltage vehicles.

TEMPERATURE INCREASE DOWNSTREAM FROM EVAPORATOR, DETERMINING MALFUNCTION

HEAT OUTPUT AND TEMPERATURE DOOR ACTIVATION, CHECKING, COMFORT

Test requirements are met, refer to HEATING OUTPUT AND TEMPERATURE DOOR ACTIVATION, TESTING REQUIREMENTS .

Close the engine hood.

Close the doors, the windows, the sunroof and the rear lid.

Open all instrument panel vents.

Turn on the ignition and activate the ready mode, the engine start by itself if needed (high voltage vehicles).

Start the engine (not high voltage vehicles).

Set the Climatronic control module -J255- as follows

1. "Auto" for the driver and passenger side (the indicator lamp in the AUTO buttons come on).
2. Temperature preset for the driver and front passenger side set to "cold" ("LO" in the Climatronic control module or in the MMI display).
3. The A/C compressor is on (the indicator lamp on the AC button comes on).
4. Preselect for the fresh air blower "maximum speed" (in the Climatronic control module and in the Multi Media Interface display, level "10" or greater).
5. Set the air vent direction using the dial on the display and control head for the driver and passenger side to "footwell" and "instrument panel vents" (in the Climatronic control module and in the MMI)

Note. The indicator lamp in the AUTO -buttons turns off when performing manual changes for the airflow direction and/or the fresh air blower speed. The maximum possible fresh air blower speed depends on several conditions (coolant temperature, vehicle voltage, etc.) If the dial for setting the driver side temperature is held for a longer time, then this setting will be taken over as well for the passenger side.

Set the rear temperature selection potentiometer -G538- to "cold" (installed in the vent in the rear center console).

Open the vents in the rear center console.

Perform Guided Fault Finding on A/C system and select the "Read measuring value block" function using the Vehicle diagnostic tester in "Guided Fault Finding".

Let the A/C run a few minutes with maximum cooling output (A/C compressor is switched on, indicator lamp in the AC button comes on).

Compare the measured values taken from the evaporator vent temperature sensor -G263- with the measured values taken from the left front upper body outlet temperature sensor -G385-, the right front upper body outlet temperature sensor -G386-, the left footwell vent temperature sensor -G261- and the right footwell vent temperature sensor -G262-).

Target values

1. After 5 minutes, the temperature sensor measured values from the heater core (left front upper body outlet temperature sensor, right front upper body outlet temperature sensor, left footwell vent temperature sensor and right footwell vent temperature sensor) may not be greater than 5 °C (41 °F), than the value of the evaporator vent temperature sensor.

If the required values are not reached, perform a fault finding at a temperature increase on the evaporator HEAT OUTPUT AND TEMPERATURE DOOR ACTIVATION, CHECKING, COMFORT => Temperature Increase Downstream from Evaporator, Determining Malfunction

Using a commercially available thermometer, measure the air coming out of the vents in the rear center console and the rear footwell vents (left and right under the front seats) and compare the measured values with the temperatures displayed in the measured values block.

Target values

1. The measured values may be 5 °C (41 °F) greater than the displayed measured values for the temperature sensor.

If the required values are not reached, perform a fault finding at a temperature increase on the evaporator HEAT OUTPUT AND TEMPERATURE DOOR ACTIVATION, CHECKING, COMFORT => Temperature Increase Downstream from Evaporator, Determining Malfunction

Using the dial on the Climatronic control module, set the temperature for the passenger side to "Warm" (display "HI" in the Climatronic Control Module and in the MMI display).

Read the measured values displayed in the measured values block (evaporator vent temperature sensor -G263-, left front upper body outlet temperature sensor -G385-, right front upper body outlet temperature sensor -G386-, left footwell vent temperature sensor -G261- and right footwell vent temperature sensor -G262-).

Using a commercially available thermometer, measure the temperature of the air coming out of the vents in the rear center console (left and right).

Target values

1. The temperature on the right front upper body outlet temperature sensor and right footwell vent temperature sensor increase to above 52 °C (125 °F) an (depending on the engine temperature at the time).
2. The temperature on the left front upper body outlet temperature sensor and left footwell vent temperature sensor increases by less than 10 °C (50 °F) in contrast to the measured value of the evaporator vent temperature sensor.
3. The measured temperature of the air coming out of the vents in the rear center console increases by less than 20 °C (68 °F).

Note. Depending on the engine, for example, on the 8 cylinder engine, it may be necessary to increase the engine from 1, 200 to 1, 500 to reach the required temperature. The heating performance of the engine or coolant flowing through the heater core may not be sufficient when the engine is running in idle to bring the necessary warming energy into the heater core (for example, on an 8 cylinder engine with an idle RPM of approximately 650). The actuation of the temperature doors for the rear vents (by the Rear Temperature door Motor -V137-) is performed by a characteristic curve in the Climatronic control module. If the setting between the left and right side in the Climatronic control module and / or the setting on the Rear Temperature Selection Potentiometer -G538- differs very much, then the temperature doors for the rear vents are no longer set in the end stops. The actuation of the temperature flaps for the temperature of the air coming out of the rear vents depends on the setting of the on the rear temperature selection potentiometer -G538- which has a tendency to be somewhat warmer or cooler the air for the front vents. On high voltage vehicles, lower the fresh air blower -V2- speed. The coolant pump -V50- delivery is not always enough to supply the required heat output when the engine is running and the fresh air blower is set to the highest setting.

IF THE SPECIFIED VALUES ARE NOT REACHED, CHECK THE FOLLOWING

1. Repeat the heating output at an engine RPM of approximately 1, 500 to 2, 000 (at a low fresh air blower speed on high voltage vehicles). If the heating performance is not reached at the engine RPM (fresh air blower speed), the fault is not with the A/C unit but rather inside the coolant circuit (a combination of the A/C system in the coolant circuit, engine coolant pump delivery, the coolant flowing through the heater core, etc. Refer to «HEATER CORE/HOUSINGS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2) and «DESCRIPTION AND OPERATION»(ref-520122-S38578899852012123100000) or to «[For engine(s) CAEB] Description and Operation»(ref-520126-S15924086162012123100000) or to «[For engine(s) CALA] Description and Operation»(/audi/a5/i-2007-2011/remont/cooling-fan/#32l-cooling-system-engine-codes-cala-coupe-as-of-122008) ).
2. The actuation and function of the right temperature door motor -V159-, of the left temperature door motor -V158- and the actuation of the front left and right temperature doors; refer to «HEATER CORE HOUSING TEMPERATURE DOORS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__heater-core-housing-temperature-doors) , «RIGHT TEMPERATURE DOOR MOTOR -V159»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__right-temperature-door-motor-v159) and the Vehicle diagnostic tester in "Guided Fault Finding".
3. Actuation and function of the rear temperature door motor -V137- and the actuation of the rear left and right temperature door (via the connecting rod), refer to «HEATER CORE HOUSING TEMPERATURE DOORS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__heater-core-housing-temperature-doors) and «TEMPERATURE REGULATOR DOOR MOTOR -V68- AND REAR TEMPERATURE DOOR MOTOR -V137»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__temperature-regulator-door-motor-v68-and) and the Vehicle diagnostic tester in "Guided Fault Finding".
4. Foam seal on heater core for heater of A/C unit, refer to «HEATER CORE REMOVING AND INSTALLING»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__heater-core-removing-and-installing) .
5. The foam seal on the Auxiliary Air Heater Heating Element -Z35- / on the honey comb, refer to «AUXILIARY AIR HEATER HEATING ELEMENT -Z35- / HONEY COMB»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__auxiliary-air-heater-heating-element-z35) .
6. Ventilation of coolant circuit, refer to «[For engine(s) CAUA] Description and Operation»(ref-520122-S38578899852012123100000) or to «[For engine(s) CAEB] Description and Operation»(ref-520126-S15924086162012123100000) or to «[For engine(s) CALA] Description and Operation»(/audi/a5/i-2007-2011/remont/cooling-fan/#32l-cooling-system-engine-codes-cala-coupe-as-of-122008) .
7. The integration of the heater core in the coolant circuit, refer to «[For engine(s) CAUA] Description and Operation»(ref-520122-S38578899852012123100000) or to «[For engine(s) CAEB] Description and Operation»(ref-520126-S15924086162012123100000) or to «[For engine(s) CALA] Description and Operation»(/audi/a5/i-2007-2011/remont/cooling-fan/#32l-cooling-system-engine-codes-cala-coupe-as-of-122008)
8. The separations in the air distribution housing between the left and right side and between rear and front, refer to «AIR DISTRIBUTOR HOUSING DOORS AND PARTITIONS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__air-distributor-housing-doors-and-partitions) .
9. Coolant regulator (engine coolant may not warm properly if regulator is malfunctioning), refer to «[For engine(s) CAUA] Description and Operation»(ref-520122-S38578899852012123100000) or to «[For engine(s) CAEB] Description and Operation»(ref-520126-S15924086162012123100000) or to «[For engine(s) CALA] Description and Operation»(/audi/a5/i-2007-2011/remont/cooling-fan/#32l-cooling-system-engine-codes-cala-coupe-as-of-122008) .
10. Check the engine coolant pump for correct function (if the coolant pump is defective, it is possible that not enough coolant is flowing through the heater core for heating in the A/C unit). Refer to «[For engine(s) CAUA] Description and Operation»(ref-520122-S38578899852012123100000) or to «[For engine(s) CAEB] Description and Operation»(ref-520126-S15924086162012123100000) or to «[For engine(s) CALA] Description and Operation»(/audi/a5/i-2007-2011/remont/cooling-fan/#32l-cooling-system-engine-codes-cala-coupe-as-of-122008) .
11. Coolant pump -V50- activation and function (if the coolant pump is faulty, then not enough coolant is flowing through the heater core in the air conditioner for heating). Refer to the Vehicle diagnostic tester in "Guided Fault Finding".

Note. The coolant pump -V50- maintains the coolant flow through the heater core in the A/C system when the engine is not running for vehicles with a start-stop system and for high voltage vehicles.

Using the dial on the Climatronic control module, set the temperature on the driver side to "Warm" (display "HI" for the driver and passenger side in the Climatronic control module and in the MMI display).

Read the measured values of the heater core temperature sensor (left front upper body outlet temperature sensor -G385-, right front upper body outlet temperature sensor -G386-, left footwell vent temperature sensor -G261- and right footwell vent temperature sensor -G262-).

Using a commercially available thermometer, measure the temperature of the air coming out of the vents in the rear center console (left and right).

Target values

1. The temperature on the right front upper body outlet temperature sensor and right footwell vent temperature sensor increases to above 52 °C (125 °F) within 5 minutes (depending on the engine temperature at the time).
2. The temperatures from the temperature sensor displayed in the measure values block (left front upper body outlet temperature sensor, right front upper body outlet temperature sensor, left footwell vent temperature sensor and right footwell vent temperature sensor) even out within 5 minutes (the difference in temperature is less than 5 °C (41 °F) and the temperature is greater than 52 °C) (125 °F).
3. The measured temperature coming out of the vents in the left and right side of the rear center console increases but does not reach the displayed temperatures for the temperature sensor (left front upper body outlet temperature sensor, right front upper body outlet temperature sensor, left footwell vent temperature sensor and right footwell vent temperature sensor) (has a tendency to be cooler than the setting on the rear temperature selection potentiometer -G538-), refer to «HEAT OUTPUT AND TEMPERATURE DOOR ACTIVATION, CHECKING, COMFORT =>»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__heat-output-and-temperature-door-activation) .

Note. Depending on the engine, for example, on the 8 cylinder engine, it may be necessary to increase the engine from 1, 200 to 1, 500 to reach the required temperature. The heating performance of the engine or coolant flowing through the heater core may not be sufficient when the engine is running in idle to bring the necessary warming energy into the heater core (for example, on an 8 cylinder engine with an idle RPM of approximately 650). At the setting "Warm" for the driver and passenger side the specified outflow temperature on the evaporator is controlled to approximately 10 °C (50 °F) by the Climatronic control module. On high voltage vehicles, lower the fresh air blower -V2- speed. The coolant pump -V50- delivery is not always enough to supply the required heat output when the engine is running and the fresh air blower is set to the highest setting.

If the specified values are not reached, check the following HEAT OUTPUT AND TEMPERATURE DOOR ACTIVATION, CHECKING, COMFORT .

If the specified values are not reached, proceed as follows

Set the rear temperature selection potentiometer -G538- to "warm" (installed in the vent in the rear center console).

Using a thermometer, measure the temperature of the air coming out of the vents in the rear center console and the rear footwells (left and right sides) and compare with the displayed measured values for the temperature sensor (left front upper body vent temperature sensor -G385-, right front upper body vent temperature sensor -G386-, left footwell vent temperature sensor -G261- and right footwell vent temperature sensor -G262-).

Target values

1. The measured air temperature coming out of the vents in the rear center console and the rear footwell vents (left and right side increases and reaches within 5 minutes a value, which is 10 °C (50 °F) less than the small value measured and displayed by the temperature sensors.
2. The difference between the measured temperature on the left and right side is less than 5 °C (41 °F).

If the specified values are not reached, check the following

1. Check the actuation and function of the rear temperature door motor -V137- and the actuation of the rear left and right temperature doors (via the connecting rod), refer to «HEATER CORE HOUSING TEMPERATURE DOORS»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__heater-core-housing-temperature-doors) and «TEMPERATURE REGULATOR DOOR MOTOR -V68- AND REAR TEMPERATURE DOOR MOTOR -V137»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-2-of-2__temperature-regulator-door-motor-v68-and) and the Vehicle diagnostic tester in "Guided Fault Finding".
2. Additional tests should the specified values not be reached, refer to «HEAT OUTPUT AND TEMPERATURE DOOR ACTIVATION, CHECKING, COMFORT»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__heat-output-and-temperature-door-activation) .

If the specified values are not reached, proceed as follows

Using the dial on the Climatronic control module, set the temperature the front passenger side to "Cold" (display "LO" in the Climatronic control module and in the MMI display).

Compare the displayed measured value from the evaporator vent temperature sensor -G263- to the measured values from the right front upper body outlet temperature sensor -G386- and from the right footwell vent temperature sensor -G262- and then read the measured valued for the left front upper body outlet temperature sensor -G385- and the left footwell vent temperature sensor -G261-.

Target values

1. The measured and displayed temperatures on the left front upper body outlet temperature sensor on the left footwell vent temperature sensor will change slightly and will remain greater than 52 °C (125 °F) depending on the engine temperature at the time).
2. The temperature on the right front upper body outlet temperature sensor and on the right footwell vent temperature sensor will drop and after 5 minutes at the latest, it will reach a value of maximum 10 °C (50 °F) than the values from the evaporator vent temperature sensor.

Note. Depending on the engine, for example, on the 8 cylinder engine, it may be necessary to increase the engine from 1, 200 to 1, 500 to reach the required temperature. The heating performance of the engine or coolant flowing through the heater core may not be sufficient when the engine is running in idle to bring the necessary warming energy into the heater core (for example, on an 8 cylinder engine with an idle RPM of approximately 650). At the setting "Warm" for the driver and passenger side the specified outflow temperature on the evaporator is controlled to approximately 10 °C (50 °F) by the Climatronic control module. If the temperature setting "cold" is selected for one side, the Climatronic control module will lower the die specified outflow temperature on the evaporator and will control this to approximately 2 °C (35 °F). On high voltage vehicles, lower the fresh air blower -V2- speed. The coolant pump -V50- delivery is not always enough to supply the required heat output when the engine is running and the fresh air blower is set to the highest setting.

If the specified values are not reached, check the following HEAT OUTPUT AND TEMPERATURE DOOR ACTIVATION, CHECKING, COMFORT .

If the specified values are reached, the test is complete.

DRIVE PLATE WITH OVERLOAD PROTECTION, CHECKING RUN-OUT AND ADJUSTING

Remove the A/C compressor. Refer to S5 A/C COMPRESSOR or RS5 A/C COMPRESSOR .

Clean the drive plate flange -A-.

Scheme 294

Secure a dial gauge -B- using a dial gauge holder -C- (for example using dial gauge holder VW 387) on A/C compressor.

Set probe of dial gauge -D- on flange of drive plate -A- with a pre-tension of approximately 1.0 mm.

Turn compressor drive unit -E- a few turns.

Specification

Run-out deviation is less than 0.21 mm (run-out of dial indicator, difference between smallest and largest measured value 0.2 mm maximum)

If run-out deviation is greater than 0.2 mm, loosen bolts on drive plate, refer to DRIVE PLATE WITH OVERLOAD PROTECTION and re-adjust drive plate.

A/C PRESSURE/TEMPERATURE SENSOR -G395

Note. The cooling output cannot be checked when the A/C pressure/temperature sensor is removed. The Climatronic control module -J255- display and control head does not switch on the A/C compressor. The refrigerant circuit remains closed, connection with valve. Only A/C pressure/temperature sensor -G395- may be installed on this vehicle (the LIN bus performs the data exchange). A high pressure sensor -G65- cannot be installed on this vehicle (it only delivers square-wave signals).

REMOVING

Turn off the ignition.

Remove the upper cover on the lock carrier cover. Refer to Description and Operation .

Disconnect the electrical connector -A-.

Disconnect the A/C pressure/temperature sensor -A- from the condenser connector -C-.

Scheme 295

INSTALLING

Installation is done is reverse order, observe the following

Replace the O-ring -B-. Refer to REFRIGERANT CIRCUIT O-RINGS

Tighten the A/C Pressure/Temperature Sensor -A-.

1. Tightening specification: 5 Nm.

Check the Climatronic control module -J255- display and control head DTC memory and erase any displayed malfunctions if necessary. Refer to the Vehicle Diagnostic Tester under "Guided Fault Finding".

Checking the A/C pressure/temperature sensor signal, refer to A/C PRESSURE/TEMPERATURE SENSOR -G395-, CHECKING PRESSURE SIGNAL .

Note. The signal from the A/C pressure/temperature sensor is checked as described in Guided Fault Finding for the A/C system. Refer to the Vehicle Diagnostic Tester under "Guided Fault Finding". The vehicle electrical system control module -J519- evaluates the A/C pressure/temperature sensor signal. It is transmitted via the Data bus to the Climatronic control module -J255-. Refer to appropriate SYSTEM WIRING DIAGRAM. If a malfunction in the signal from the A/C pressure/temperature sensor is recognized, then the malfunction will be entered in the vehicle electrical system control module memory and in the Climatronic control module. It will be necessary to the check the vehicle electrical system control module DTC memory when reading the Climatronic control module DTC memory. Refer to the Vehicle Diagnostic Tester under "Guided Fault Finding". The A/C pressure/temperature sensor measured values are displayed in the vehicle electrical system control module measured values block using the Vehicle Diagnostic Tester under "Guided Fault Finding". The displayed temperature is currently not used by the Climatronic control module.

A/C UNIT AIR INTAKE HOUSING

Note. From 01.2008, A/C units which have an additional connection for the glove compartment cooling are being installed. On vehicles without glove compartment cooling, this connection is sealed with a plug. Refer to GLOVE COMPARTMENT COOLING TO AIR INTAKE MANIFOLD CONNECTION . Make sure that the correct right heater housing and air intake housing are installed. From MY 12, a new version is being used. Read all the information regarding this component. Refer to A/C UNIT AND AIR INTAKE HOUSING OVERVIEW, BASIS A/C SYSTEM .

Switch on the ignition.

Set the air flow direction to "DEF" on the Climatronic control module -J255-.

Move the passenger seats as far back as possible.

Turn off the ignition.

Remove the glove compartment. Refer to Storage Compartments and Covers in Removal and Installation .

Remove the right (passenger) footwell vent. Refer to RIGHT FOOTWELL VENT .

Remove the screw clips -A- and remove the insulation mat -B-.

Scheme 296

Remove bolts -A-.

Scheme 297

Loosen the air duct for the right instrument panel vent from the instrument panel crossmember, but do not remove it.

Note. The air guide from the air guide channel -B- is attached to the right instrument panel vent with two screws. To loosen, remove the screw which is installed at the bottom and is accessible.

Remove the air guide channel -B- leading to the right instrument panel vent (passenger side).

Remove the lower A-pillar trim -C- and the bracket -B-. Refer to Interior Trim .

Scheme 298

Disconnect the terminal -A- from the Fresh Air Blower Control Module -J126-.

Remove the headlamp range control module -J431- -1- (headlamp range/cornering lamp control module -J745-) and mount. Refer to Removal and Installation , if applicable.

Scheme 299

Remove the fresh air blower -V2-. Refer to FRESH AIR BLOWER -V2 .

Note. The A/C unit air intake housing can be removed and installed with the fresh air blower still installed, however since space it limited, it is better to remove the fresh air blower.

Loosen the cables -A- from the mounting points on the air intake housing.

Scheme 300

Disengage locking mechanism -C- (between the A/C and the air intake housing -B-) for example, using a screwdriver -D- (lift slightly and pull in the direction of the arrow)

Pull the air intake housing -B- (after disengaging the locking mechanism -C-) to the right and down (in the direction of the arrow).

Mark the terminals leading to the Air Flow Door Motor -V71- -E- and -F- leading to the Recirculation Door Motor -V113- (due to the danger of confusing them with other identical terminals) and disconnect them from these control motors.

Loosen the upper A/C strap -E- from the air intake housing bracket -D-.

Scheme 301

Loosen both lower mounting points between the A/C -B- and the air intake housing -A-.

Remove the air intake housing.

Installation is carried out in the reverse order while observing the following.

Check the evaporator -A- and the air guide in the A/C leading to the evaporator -B- for dirt and clean is necessary.

Scheme 302

Check the dust and pollen filter and the air guide in the air intake housing leading to the A/C -C- for dirt and clean if necessary.

Check the groove around the A/C -D- and the bevel around the air intake housing -E- for damage.

Note. If the groove or the bevel are damaged, fill the damaged spot with, for example, silicone sealant D176 001 A3. When using the A/C, air could leak from here and this could result in noises.

Check the seal on the fresh air intake shaft -A- for damage before installing the air intake manifold -C-. Replace the seal if it is damaged.

Scheme 303

Check the position of the lock, only if the latch -B- is in the position shown, can the air intake housing -C- and the A/C -D- be joined together.

According to the markings, connect the terminals leading to the Air Flow Door Motor -E- and leading to the Recirculation Door Motor -F- with the control motors.

Insert both lower air intake housing straps -A- into the mounting points on the A/C -B-.

Lift the air intake housing to the right far enough so that the upper A/C strap -C- fits into the air intake housing bracket -D- and then press both parts together.

Note. If the latch -E- should slip forward while installing, both parts cannot be joined together When joining the two parts together, make sure no other components get jammed in and that the bevel on air intake housing fits into the groove on the A/C all around.

Slide the latch -C- opposite the direction of the arrow (this locks the A/C with the air intake housing -B-).

Loosen the cables -A- into the mounting points on the air intake housing.

Note. When routing the wires, make sure that they are routed on the control motors so that they cannot get caught in any moving parts on the motors.

Reinstall the removed parts in the opposite order.

Switch on the ignition.

Perform a basic setting and the output Diagnostic Test Mode (DTM) on the A/C system using the Vehicle Diagnostic Tester under "Guided Fault Finding".

Note. On this vehicle, the control motors are equipped with electronics. During the first basic setting, a new control motor learns its position on the air conditioner and can then be controlled by the Climatronic Control Module -J255- (currently all control motors are identical). Check using the Vehicle Diagnostic Tester under "Guided Fault Finding". During the basic setting, the control motors are assigned and adapted corresponding to the switching sequence of the wiring. If this sequence does not conform the specification, the control motors will adapt incorrectly and the door control will be wrong. Refer to A/C CONTROL MOTOR BLOCK DIAGRAM . Make sure then both control motors, the airflow door motor -V71- and the recirculation door motor -V113- are connected correctly. Check the activation using the "A/C output diagnostic test mode". When the glove compartment is removed, the air recirculation door - F- is visible. Refer to Vehicle Diagnostic Tester in "Guided Fault Finding" function.

Check the DTC memory for the Climatronic control module control head and erase any entries if necessary using the Vehicle Diagnostic Tester in "Guided Fault Finding" function.

Turn off the ignition.

Remove the air intake housing. Refer to A/C UNIT AIR INTAKE HOUSING .

Loosen the catches -A- and remove the air intake duct -B- from the air intake housing -C-.

Scheme 304

Installation is carried out in the reverse order while observing the following.

Insert the air intake duct -B- into the brackets -C- on the air intake housing -C- and join both parts together.

Note. If one of the retaining tabs -A- has broken off or if one of the welded points no longer holds, both housing parts can be bolted together with screws -D-.

Install the removed parts in the opposite order.

Perform a basic setting and the output Diagnostic Test Mode (DTM) on the A/C system using the Vehicle Diagnostic Tester under "Guided Fault Finding".

Check the Climatronic control module -J255- display and control head DTC memory and erase any displayed malfunctions if necessary using the Vehicle Diagnostic Tester under "Guided Fault Finding".

AIR QUALITY SENSOR -G238- / HUMIDITY SENSOR IN FRESH AIR INTAKE DUCT -G657

Note. There are different versions depending on the vehicle date of manufacture and which A/C system ("Basis" or "Comfort") is installed. Refer to AIR QUALITY SENSOR -G238- AND HUMIDITY SENSOR IN FRESH AIR INTAKE DUCT -G657- FUNCTION . The air quality sensor is installed only on vehicles with the "Comfort" A/C system. The humidity sensor in fresh air intake duct is only installed on MY 12 vehicles as a running change. Refer to AIR QUALITY SENSOR -G238- AND HUMIDITY SENSOR IN FRESH AIR INTAKE DUCT -G657- FUNCTION . The air quality sensor / humidity sensor in fresh air intake duct are highly sensitive electronic components that can get damaged if they come in direct contact with solvents, fuels or chemicals (e.g. impurities may enter through area -A-). Therefore, never install an air quality sensor / humidity sensor in fresh air intake duct that was stored, for example, in a tool box. Following removal, do not set down air quality sensor / humidity sensor in fresh air intake duct in areas where it could come into contact with solvents, fuels or certain chemical compounds (liquids or vapors). There are different versions of the air quality sensor / humidity sensor in fresh air intake duct with different functions.

Installed on high voltage systems (hybrid vehicles)

Read and follow all of the supplemental warnings for all work performed on vehicles with the high voltage system. Refer to HIGH VOLTAGE SYSTEM (HYBRID VEHICLES) REPAIRS

If it is necessary for the following procedure to perform work in the vicinity of high voltage components, perform a visual inspection of the high voltage components and cables for damages, refer to VISUAL INSPECTION OF HIGH-VOLTAGE COMPONENTS AND CABLES FOR DAMAGE and always follow the warnings when working on the high voltage system. .

Turn off the ignition.

Remove the rubber seal -A- and the plenum chamber cover -B- (there are different versions). Refer to Removal and Installation .

1. Inspect the high voltage components -D- (the electric drive power and control electronics -JX1-) and the high voltage cables -E- after removing the plenum chamber cover -B-. Refer to «VISUAL INSPECTION OF HIGH-VOLTAGE COMPONENTS AND CABLES FOR DAMAGE»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__visual-inspection-of-high-voltage-components-and) .

1. Be careful not to damage any high voltage components -D- or the high voltage cables -E-. .
2. Inspect the high voltage components -D- and high voltage cables -E- after completing the work procedure and before installing the plenum chamber cover -B-. .

For vehicles without a high voltage system

Switch off ignition.

Pull the left rubber seal -B- as far as necessary. Refer to Removal and Installation .

Remove the fresh air intake cover on the wind cowl -A- or the wind cowl (different styles). Refer to Body Front .

Note. If necessary, carefully loosen the wind cowl from the windshield cross member -C- Removal and Installation .

All vehicles

Turn the air quality sensor / humidity sensor in fresh air intake duct -A- approximately 90° to the left and remove it from the fresh air intake -C-.

Disconnect the connector -B- from the air quality sensor / humidity sensor in fresh air intake duct.

Terminal assignment in connector -B

1 - B+ (terminal "15")

2 - Ground (terminal "31")

3 - Signal wire to the Vehicle Electrical System Control Module -J519-. Refer to the appropriate SYSTEM WIRING DIAGRAM.

Note. The signal from the air quality sensor / humidity sensor in fresh air intake duct cannot be monitored by workshop equipment. The vehicle electrical system control module evaluates the data from the air quality sensor / humidity sensor in fresh air intake duct and then transmits it to the Climatronic control module -J255- display and control unit via the Data bus. There are different versions of the air intake shroud for the fresh air intake -C- (with and without a mount for the for the air quality sensor / humidity sensor in fresh air intake duct -A-, in the front or on the side). The measured values from the air quality sensor / humidity sensor in fresh air intake duct are displayed in the Climatronic control module display and control head measured values block and in the vehicle electrical system control module -J519- measured values block. Explanatory notes of the displays refer to the Vehicle Diagnostic Tester in "Guided Fault Finding" function.

AUXILIARY AIR HEATER HEATING ELEMENT -Z35- / HONEY COMB

Note. Currently, vehicles with certain gasoline engines (for example, vehicles that can use bioethanol "Flex Fuel Vehicle" from MY 10 and on high voltage vehicles) have an electric auxiliary heater. Refer to the Audi Sales Program. The air is supplied with heat energy after leaving the heater core if there is a request from the Climatronic Control Module -J255- A/C control head. The respective engine control module activates the auxiliary heater heating element) (the control modules exchange information about this via the data bus system). Refer to the Vehicle Diagnostic Tester in "Guided Fault Finding" and appropriate SYSTEM WIRING DIAGRAM. The activation of the auxiliary heater heating element occurs for vehicles with a gasoline engine from the Climatronic control module control head via the local Data bus (controlled using the same outlet and also using the fresh air blower control module -J126-) on the auxiliary air heater control module -J604-. The auxiliary air heater control module activates the low heat output relay -J359- and the high heat output relay -J360- (and these send the electricity to the auxiliary heater heating element). Refer to the Vehicle diagnostic tester in "Guided Fault Finding" and appropriate SYSTEM WIRING DIAGRAM. Make sure the auxiliary air heater heating element is working. Refer to AUXILIARY HEATER HEATING ELEMENT -Z35-, TESTING . Vehicles without an auxiliary air heater heating element have a honey comb inside the air conditioner as a place holder. Refer to AIR ROUTING IN AIR INTAKE HOUSING AND A/C UNIT In MY 2009, as a running change, a new version of the auxiliary air heater heating element is being installed (the heating element is a bit more narrow); be sure to use the correct version and note the allocation.

Switch on the ignition.

Set the air flow direction to "DEF" on the Climatronic control module.

Move the passenger seats as far back as possible.

Turn off the ignition.

Remove the air intake housing. Refer to A/C UNIT AIR INTAKE HOUSING .

Disconnect the connector from the Evaporator Vent Temperature Sensor -G263-. Refer to EVAPORATOR VENT TEMPERATURE SENSOR -G263 .

Carefully fold back the carpet around the center console and loosen the ground connection to the auxiliary air heater heating element -A- from the ground point on the right side of the center tunnel. Refer to the appropriate SYSTEM WIRING DIAGRAM.

Scheme 305

Disconnect the connector -B- and loosen the connector -C- from the right heater core housing.

Loosen the wiring for the auxiliary air heater heating element -D- from the mounts on the heater core housing.

Remove the right heater core housing. Refer to RIGHT HEATER CORE HOUSING, MOTOR MOUNTING PLATE REMOVED or RIGHT HEATER CORE HOUSING AND RIGHT MOTOR MOUNTING PLATE .

Remove the auxiliary air heater heating element -A- from the A/C unit.

Scheme 306

Installation is carried out in the reverse order while noting the following

The installed auxiliary air heater heating element (the honeycomb) has, depending the version of the A/C, is supplied with foam seals -A- and -B-.

Scheme 307

1 - Honeycomb for a vehicle equipped with a "Basis" A/C system.

2 - Honeycomb for a vehicle equipped with a "Comfort" A/C system.

3 - Auxiliary air heater heating element for a vehicle equipped with a "Basis" A/C system.

4 - Auxiliary air heater heating element for a vehicle equipped with a "Comfort" A/C system.

Note. On vehicles with the "Comfort" A/C system, there are different temperature settings for the left and right sides as well as for the rear. The seal -B- separates the air guides for the left and right sides. Refer to AIR ROUTING IN AIR INTAKE HOUSING AND A/C UNIT . The seal -B- must be applied in the center of the honey comb on the auxiliary air heater heating element. Seal may curl up on insertion if not correctly bonded on. If the seal is damaged or installed incorrectly, cold air can flow over the auxiliary air heater heating element (on the honeycomb); on vehicles equipped with the "Comfort" A/C system, it is possible that there is no clear separation between the left and right side.

With the auxiliary air heater heating element removed, check the A/C, the heater corer and the evaporator -B- (honeycomb) for dirt; if necessary clean.

Install the auxiliary air heater heating element (honeycomb) -A- in the A/C unit.

Note. On the "Comfort" A/C system, be careful when installing the groove - / spring connection -C- and -D-.

Install the removed parts in the opposite order.

Perform a basic setting and the output Diagnostic Test Mode (DTM) on the A/C system using the Vehicle diagnostic tester in "Guided Fault Finding".

Note. On this vehicle, the control motors are equipped with electronics. During the first basic setting, a new control motor learns its position on the air conditioner and can then be controlled by the A/C Control Head Climatronic Control Module -J255- (currently all control motors are identical). Check using the Vehicle diagnostic tester in "Guided Fault Finding". During the basic setting, the control motors are assigned and adapted corresponding to the switching sequence of the wiring. If this sequence does not conform with the specification, the control motors will adapt incorrectly and the door control will be wrong. Refer to A/C CONTROL MOTOR BLOCK DIAGRAM .

Switch on the ignition.

Check the Climatronic Control Module DTC memory and erase any displayed malfunction if necessary using the Vehicle diagnostic tester in "Guided Fault Finding".

If necessary, check the auxiliary air heater heating element activation and function after installing. Refer to AUXILIARY HEATER HEATING ELEMENT -Z35-, TESTING .

Adjust and check the air flow direction on the different air ducts via Climatronic control module, if the quantity of air actually changes at each setting.

BATTERY COOLING MODULE, SERVICE POSITION

With high voltage systems (hybrid vehicles)

Read and follow all of the supplemental warnings for all work performed on vehicles with the high voltage system. Refer to HIGH VOLTAGE SYSTEM (HYBRID VEHICLES) REPAIRS

If it is necessary for the following procedure to perform work in the vicinity of high voltage components, perform a visual inspection of the high voltage components and cables for damages. Refer to VISUAL INSPECTION OF HIGH-VOLTAGE COMPONENTS AND CABLES FOR DAMAGE and always follow the warnings when working on the high voltage system. .

Bring the battery cooling module into the service position

Turn off the ignition.

Remove the luggage compartment floor. Refer to Removal and Installation .

Remove the rear outlet air guide for the traction battery. Refer to TRACTION BATTERY REAR OUTLET AIR GUIDE .

Remove the front outlet air guide for the traction battery, refer to TRACTION BATTERY FRONT OUTLET AIR GUIDE .

Remove the air guide for the battery coolant module, refer to TRACTION BATTERY INLET AIR GUIDE .

Disconnect and free up the connectors -1, 2-.

Scheme 308

Remove the nuts -arrows-.

Cover Traction battery -A2- with Audi fender protector V.A.G 1917A -2-.

Scheme 309

Remove the battery coolant module -1- and lay it on the covered battery module as illustrated.

Installing

Installation is carried out in the reverse order while observing the following.

Reinstall the previously removed component.

Switch on the ignition.

After installing, check and, if necessary, erase the displayed faults in the DTC memory for the Climatronic control module -J255- control head and the battery regulation control module -J840-. Refer to the Vehicle diagnostic tester in "Guided Fault Finding".

BATTERY COOLING MODULE CONDENSATION WATER DRAIN

With high voltage systems (hybrid vehicles)

Read and follow all of the supplemental warnings for all work performed on vehicles with the high voltage system. Refer to HIGH VOLTAGE SYSTEM (HYBRID VEHICLES) REPAIRS

If it is necessary for the following procedure to perform work in the vicinity of high voltage components, perform a visual inspection of the high voltage components and cables for damages. Refer to VISUAL INSPECTION OF HIGH-VOLTAGE COMPONENTS AND CABLES FOR DAMAGE and always follow the warnings when working on the high voltage system. .

CHECKING

Turn off the ignition.

Remove the luggage compartment floor. Refer to Removal and Installation .

Bring the battery cooling module in the service position. Refer to BATTERY COOLING MODULE, SERVICE POSITION .

Check the condensation water drain -3- for debris and make sure it is installed correctly.

Scheme 310

Remove the luggage compartment floor. Refer to Removal and Installation .

Bring the battery cooling module in the service position. Refer to BATTERY COOLING MODULE, SERVICE POSITION .

Remove the nuts -2- and -3- and move the heat shield slightly to the left.

Scheme 311

Unlock the plastic ring -arrows- and push the condensation water drain into the battery cavity.

Remove the condensation water drain from the bracket.

Installation is carried out in the reverse order while observing the following.

Note. Replace the condensation water drain if the plastic ring is damaged. Caulk the plastic ring with silicon if it is loose.

Note the installation position when attaching the plastic ring

Scheme 312

1. The tabs -1- for the plastic ring must be positioned between both of the markings for the condensation water drain -arrows-.

Attach the condensation water drain -arrow A- so that the tabs -1- engage in the opening -2- in the bracket.

Install the grommet in the opening in the battery cavity. Insert the top tab -4- first and then lock the bottom one.

Note. If the grommet on the battery cavity is not completely caulked, caulk this position with for example silicone adhesive D 176 001 A3. The adhesive surface must be clean and free of grease when applying the silicone adhesive.

Check that the condensation water drain is in the correct position.

Scheme 313

1. The tab -2- must face the seam -1- in the bracket.

Install the remaining removed components.

Switch on the ignition.

After installing, check and, if necessary, erase the displayed faults in the DTC memory for the Climatronic control module -J255- control head and the battery regulation control module -J840-. Refer to the Vehicle diagnostic tester in "Guided Fault Finding".

BATTERY FAN 1 -V457

With high voltage systems (hybrid vehicles)

Read and follow all of the supplemental warnings for all work performed on vehicles with the high voltage system. Refer to HIGH VOLTAGE SYSTEM (HYBRID VEHICLES) REPAIRS

If it is necessary for the following procedure to perform work in the vicinity of high voltage components, perform a visual inspection of the high voltage components and cables for damages. Refer to VISUAL INSPECTION OF HIGH-VOLTAGE COMPONENTS AND CABLES FOR DAMAGE and always follow the warnings when working on the high voltage system. .

Note. Voltage is supplied via the fan activation relay -J937-. Refer to appropriate SYSTEM WIRING DIAGRAM. Controlled by the battery regulation control module -J840-. Refer to the Vehicle diagnostic tester in "Guided Fault Finding".

Turn off the ignition.

Remove the luggage compartment floor. Refer to Removal and Installation .

Bring the battery cooling module in the service position, refer to BATTERY COOLING MODULE, SERVICE POSITION .

Turn the boot -1- on the electrical connector upright and disconnect the connector.

Scheme 314

Remove the bolts -arrows-, and remove the Battery fan 1.

Installation is carried out in the reverse order while observing the following.

Install the remaining removed components.

Switch on the ignition.

After installing, check and, if necessary, erase the displayed faults in the DTC memory for the Climatronic control module -J255- control head and the battery regulation control module -J840-. Refer to the Vehicle diagnostic tester in "Guided Fault Finding".

Special tools and workshop equipment required

1. Hook 3438

Note. In both versions ("Basis" or "Comfort") the Climatronic control module are removed and installed in the same way.

Check the Climatronic control module coding and adaptation using the "Replace Control Unit" function of the Guided Fault Finding (if the Climatronic Control Module should be replaced). Refer to the Vehicle diagnostic tester in "Guided Fault Finding".

Turn off the ignition.

Attach the 3438 -A- in one of the openings -B- or -C- in the Climatronic control module according to the illustration.

Scheme 315

Carefully pull the Climatronic Control Module in the -direction of arrow- out of center console.

Note. The Climatronic Control Module is held in the center control brackets with clamps (left and right).

Disconnect the Climatronic Control Module connectors

Loosen the harness connector release catch -C- for the connectors -A- and -B- by pulling the direction of the arrow -arrow-.

Scheme 316

Press the connector release catch -D- -arrow- and remove the connectors -A- and -B-.

Installation is carried out in the reverse order while observing the following.

1. When replacing the Climatronic control module be sure to pay attention to precise assignment. Refer to «CLIMATRONIC CONTROL MODULE -J255- A/C CONTROL HEAD ALLOCATION»(/audi/a5/i-2007-2011/remont/automatic-hvac-system/#air-conditioning-coupe-1-of-2__climatronic-control-module-j255-ac-control)

Mount the trim to the A/C control head on the Audi Q5.

Clean the adhesive surface -D- on the A/C control head -A- for example with cleaning solution D 009 401 04.

Install the Climatronic control module -A-.

Note. The trim piece -B- is supplied with a two-sided adhesive strip already installed -C-. If the trim piece -B- is going to be re-used when replacing the Climatronic control module -A-, then remove the adhesive strip -C- from the trim -B-. Clean the adhesive surface on the trim -B- as described in the instructions which came with the adhesive strip. Affix to the trim piece -B- a strip (dimension: 204 mm x 10 mm) of the two-sided adhesive strip -C- with material strength approximately 1.2 mm (for example with adhesive tape D 438 515 A1.

Mount the trim piece -B- with the adhesive tape -C- onto the adhesive surface -D- on the A/C control head -A- and the align it -B-.

Press the trim piece -B- onto the surface -D-.

1. After replacing / installing the Climatronic control module, always perform the follow work using the Vehicle diagnostic tester in "Guided Fault Finding" function.

Re-code (or check the coding) of the Climatronic control module.

Perform the basic setting, Climatronic control module.

Check DTC memory of Climatronic control module (correct the cause for any malfunctions displayed) and erase.

Check the adaptation of the front control and display unit Climatronic control module and correct if necessary.

Perform the Output Diagnostic Test, Climatronic control module (depending on the type of complaint).

See also:
• General Information
• Removal and Installation
• Description and Operation
• COMPRESSOR
• A/C COMPRESSOR
• ELECTRIC A/C COMPRESSOR
• A/C COMPRESSOR
• A/C COMPRESSOR
• [For engine(s) CALA] Description and Operation
• Specifications
• Removal and Installation
• COMFORT A/C UNIT AND AIR DISTRIBUTION HOUSING
• Removal and Installation
• Removal and Installation
• Removal and Installation
• PLENUM CHAMBER WATER DRAIN
• CONDENSATION WATER DRAIN HOSE
• DUST AND POLLEN FILTER
• A/C COMPRESSOR INPUT SHAFT, LOOSENING AND TIGHTENING
• DRIVE PLATE WITH OVERLOAD PROTECTION
• A/C COMPRESSOR DRIVE PLATE
• DRIVE PLATE WITH ANTI-FRICTION BEARING
• Removal and Installation
• A/C UNIT
• AIR CONDITIONER, LEVERS AND CONNECTING ELEMENTS
• A/C UNIT AIR INTAKE HOUSING
• EVAPORATOR, A/C UNIT INSTALLED
• EVAPORATOR HOUSING
• RECIRCULATION DOOR MOTOR -V113
• AIR FLOW DOOR MOTOR -V71
• EXPANSION VALVE
• DEFROSTER DOOR MOTOR -V107
• FOOTWELL DOOR MOTOR -V261- AND LEFT FOOTWELL DOOR MOTOR -V108
• LEFT RETAINING PLATE WITH FOOTWELL DOOR MOTOR -V261
• TEMPERATURE REGULATOR DOOR MOTOR -V68- AND REAR TEMPERATURE DOOR MOTOR -V137
• FOOTWELL VENT TEMPERATURE SENSOR -G192- / LEFT FOOTWELL VENT TEMPERATURE SENSOR -G261
• CENTER VENT TEMPERATURE SENSOR -G191
• FRESH AIR BLOWER CONTROL MODULE -J126
• CENTER VENT ADJUSTMENT MOTOR -V102
• FRESH AIR BLOWER -V2
• Maintenance, Diagnosis
• LEFT TEMPERATURE DOOR MOTOR -V158
• LEFT CENTER VENT MOTOR -V110
• LEFT RETAINING PLATE WITH LEFT FOOTWELL DOOR MOTOR -V108- AND LEFT CENTER VENT MOTOR -V110
• RIGHT FOOTWELL VENT TEMPERATURE SENSOR -G262
• RIGHT TEMPERATURE DOOR MOTOR -V159
• RIGHT CENTER VENT MOTOR -V111
• RIGHT RETAINING PLATE WITH RIGHT FOOTWELL DOOR MOTOR -V109- AND RIGHT CENTER VENT MOTOR -V111
• RIGHT FOOTWELL DOOR MOTOR -V109
• Removal and Installation
• TRACTION BATTERY INLET AIR GUIDE
• TRACTION BATTERY FRONT OUTLET AIR GUIDE
• TRACTION BATTERY LEFT AND RIGHT AIR GUIDES
• TRACTION BATTERY REAR OUTLET AIR GUIDE
• PASSENGER COMPARTMENT FORCED AIR EXTRACTION
• INSTRUMENT PANEL VENTS AND REAR VENTS
• FRESH AIR INTAKE
• RIGHT FOOTWELL VENT
• Removal and Installation
• LEFT FOOTWELL VENTS
• BATTERY COOLING MODULE
• EXPANSION VALVE WITH HYBRID BATTERY REFRIGERANT SHUT-OFF VALVE 2 -N517
• HYBRID BATTERY RECIRCULATION DOOR POSITIONING MOTORS 1 AND 2 -V479- / -V480
• TEMPERATURE SENSOR BEFORE -G756- AND AFTER HYBRID BATTERY EVAPORATOR -G757
• Description and Operation
• A/C COMPRESSOR CLUTCH PLATE
• BELT PULLEY WITH A/C CLUTCH
• A/C COMPRESSOR BELT PULLEY
• Seat Frames
• Seat Upholstery, Covers
• LEFT FRONT UPPER BODY VENT TEMPERATURE SENSOR -G385
• OUTSIDE AIR TEMPERATURE SENSOR -G17
• INTERIOR TEMPERATURE SENSOR FAN -V42
• SUNLIGHT PHOTO SENSOR -G107
• RIGHT FRONT UPPER BODY VENT TEMPERATURE SENSOR -G386
• Removal and Installation
• REFRIGERANT LINES DISCONNECTING FROM QUICK-RELEASE COUPLINGS AND CONNECTING
• FLUID RESERVOIR
• DRYER CARTRIDGE
• Removal and Installation
• HYBRID BATTERY REFRIGERANT SHUT-OFF VALVE 1 -N516
• ELECTRIC A/C COMPRESSOR REMOVING FROM BRACKET
• PASS-THROUGH REFRIGERANT LINES IN LUGGAGE COMPARTMENT
• [For engine(s) CALA] Removal and Installation
• A/C COMPRESSOR REFRIGERANT LINES
• REFRIGERANT LINES FOR BATTERY COOLING MODULE IN LUGGAGE COMPARTMENT
• REFRIGERANT PIPE WITH INNER HEAT EXCHANGER
• FRONT REFRIGERANT LINES TO BATTERY COOLING MODULE
• REAR REFRIGERANT LINES TO BATTERY COOLING MODULE
• Removal and Installation
• HEATER CORE REMOVING AND INSTALLING
• Removal and Installation
• RIGHT HEATER CORE HOUSING, MOTOR MOUNTING PLATE REMOVED
• RIGHT HEATER CORE HOUSING AND RIGHT MOTOR MOUNTING PLATE
• SAFETY PRECAUTIONS WHEN HANDLING REFRIGERANT
• SAFETY PRECAUTIONS WHEN WORKING ON VEHICLES WITH START/STOP SYSTEM
• REFRIGERANT CIRCUIT DRAINING
• WORKING ON THE REFRIGERANT CIRCUIT
• PAINTING ON VEHICLES WITH AIR CONDITIONING SYSTEM
• GENERAL REPAIR INFORMATION
• HIGH VOLTAGE SYSTEM (HYBRID VEHICLES) REPAIRS
• A/C AND REFRIGERANT SAFETY PRECAUTIONS
• REFRIGERANT CIRCUIT COMPONENT OVERVIEW
• A/C SYSTEM CONTROL AND REGULATION COMPONENTS OUTSIDE PASSENGER COMPARTMENT
• REFRIGERANT CIRCUIT, SERVICING
• CONTACT CORROSION
• A/C COMPONENTS CONTROLLED OR ACTIVATED BY OTHER CONTROL MODULES, ELECTRICAL TESTS
• COMPONENTS ACTUATED BY A/C SYSTEM, ELECTRICAL TEST
• VISUAL INSPECTION OF HIGH-VOLTAGE COMPONENTS AND CABLES FOR DAMAGE
• BELT PULLEY WITH A/C CLUTCH -N25- OVERVIEW
• CLIMATRONIC CONTROL MODULE -J255- A/C CONTROL HEAD ALLOCATION
• A/C SYSTEM, OPERATING AFTER FILLING REFRIGERANT CIRCUIT
• CONDENSER, CHECKING VERSION
• AUXILIARY HEATER HEATING ELEMENT -Z35-, TESTING
• AIR QUALITY SENSOR -G238- AND HUMIDITY SENSOR IN FRESH AIR INTAKE DUCT -G657- FUNCTION
• EVAPORATOR, CLEANING WITH ULTRASOUND A/C CLEANING SYSTEM
• REFRIGERANT CIRCUIT O-RINGS
• DRIVE PLATE WITH OVERLOAD PROTECTION, CHECKING RUN-OUT AND ADJUSTING
• AIR DISTRIBUTOR HOUSING DOORS AND PARTITIONS
• A/C UNIT AIR INTAKE HOUSING
• A/C CONTROL MOTOR BLOCK DIAGRAM
• GLOVE COMPARTMENT COOLING TO AIR INTAKE MANIFOLD CONNECTION
• A/C UNIT AND AIR INTAKE HOUSING OVERVIEW, BASIS A/C SYSTEM
• AUXILIARY AIR HEATER HEATING ELEMENT -Z35- / HONEY COMB
• DUST AND POLLEN FILTER WITH ACTIVATED CHARCOAL INSERT
• INSTRUMENT PANEL CENTER VENT AIR DUCT PLUG, INSTALLING
• AIR INTAKE AND OUTLET OPENINGS
• AIR ROUTING IN AIR INTAKE HOUSING AND A/C UNIT
• HEATER CORE HOUSING TEMPERATURE DOORS
• REAR VENT AIR GUIDE SLOTS, SEALING
• BATTERY COOLING MODULE CONDENSATION WATER DRAIN
• BATTERY COOLING MODULE, SERVICE POSITION
• BATTERY FAN 1 -V457
• A/C COMPRESSOR BELT PULLEY AND CLUTCH PLATE GAP, CHECKING
• FRONT SEAT HEATING AND VENTILATION, CHECKING
• COMPONENTS ON LEFT SIDE OVERVIEW
• REAR WINDOW DEFOGGER -Z1-, CHECKING
• CLIMATRONIC REFRIGERANT SHUT-OFF VALVE -N422- / COOLANT SHUT-OFF VALVE -N82- LOCATION, CONTROL AND FUNCTION
• AIR QUALITY SENSOR -G238- / HUMIDITY SENSOR IN FRESH AIR INTAKE DUCT -G657-, CHECKING
• A/C PRESSURE/TEMPERATURE SENSOR -G395
• A/C PRESSURE/TEMPERATURE SENSOR -G395-, CHECKING PRESSURE SIGNAL
• A/C COMPRESSOR REGULATOR VALVE -N280-, CHECKING SWITCH-ON SIGNAL
• COOLANT RECIRCULATION PUMP -V50- (WATER PUMP -V36-)
• AIR GUIDES FOR BATTERY COOLING MODULE OVERVIEW
• BATTERY COOLING MODULE OVERVIEW
• A/C COMPRESSOR
• A/C COMPRESSOR DRIVE UNIT OVERVIEW
• REFRIGERANT LINES TO BATTERY COOLING MODULE OVERVIEW
• A/C COOLING OUTPUT, TESTING REQUIREMENTS
• COOLING OUTPUT, CHECKING
• ICE FORMATION ON EVAPORATOR, LOCALIZING MALFUNCTION
• REQUIRED COOLING OUTPUT NOT REACH, MALFUNCTION NOTIFICATION
• HEATING OUTPUT AND TEMPERATURE DOOR ACTIVATION, CHECKING, BASIS
• HEAT OUTPUT AND TEMPERATURE DOOR ACTIVATION, CHECKING, COMFORT