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Home/Chevrolet/Aveo/Chevrolet Aveo I рестайлинг (2006-2012)/Repair manual/Automatic HVAC System/HVAC System - Automatic
Contents Section: Automatic HVAC System All sections

HVAC System - Automatic Chevrolet Aveo I рестайлинг

Automatic HVAC System 6 illustrations ~1785 words

Fastener Tightening Specifications

ApplicationSpecification
MetricEnglish
Control Assembly Retaining Screws2N.m18 lb in

Scheme 1

Scheme 1: HVAC Schematics
Scheme 1: HVAC Schematics

Scheme 2

Scheme 2
Scheme 2

Scheme 3

Scheme 3
Scheme 3

Scheme 4

Scheme 4
Scheme 4

Scheme 5

Scheme 5
Scheme 5

Scheme 6

Scheme 6
Scheme 6

Conditions for Setting the DTC

This DTC will set if the output of the in-car sensor indicates a probable short circuit or an open in the sensor or the associated wiring harness, or a malfunction of the automatic temperature control (ATC) controller.

StepActionValue(s)YesNo
1Disconnect the in-car sensor connector from the automatic temperature control (ATC) controller. Inspect the wiring from the sensor to the connector and the connector for any signs of damage. Measure the resistance between the in-car sensor connector terminals. Is there any sign of damage in the wiring or connector, or is the resistance measured outside the specified range at 25°C (77°F)?2.2K ohms ± 3%Go to Step 2Go to Step 3
2Repair the damaged wiring or the connector, or replace the in-car sensor as required. Did you find and correct the condition?System OK
3Turn the ignition to ON. Measure the voltage between the two connector terminals on the controller housing. Is the voltage measured greater than or equal to the value specified at 25°C (77°)?2.2 VGo to Step 7Go to Step 4
4Inspect the terminals on the in-car sensor connector. Is any problem found with the connector?Go to Step 5Go to Step 6
5Repair the connector terminals or replace the in-car sensor or ATC controller as required. Did you find and correct the condition?System OK
6Connect the in-car sensor to the controller. Turn the ignition switch to ON. Observe the temperature display area. Does this display indicate the continuing presence of a DTC 1 condition?Go to Step 7System OK
7Replace the ATC controller. Did you complete the replacement?System OK

This DTC will set if the output of the ambient air temperature sensor indicates a probable short circuit or an open in the sensor or the associated wiring harness, or a malfunction of the automatic temperature control (ATC) controller.

StepActionValue(s)YesNo
1Disconnect the ambient air sensor connector from the front bumper harness. Measure the resistance between the ambient air sensor connector terminals. Is the resistance measured equal to the specified range at 25°C (77°F)?2.2K ohms ± 3%Go to Step 5Go to Step 2
2Remove the ambient air sensor from behind the front bumper. Inspect the wiring for any open or short and examine the connector for any damage. Is there a problem with the wiring or the connector?Go to Step 3Go to Step 4
3Repair the problem found in the ambient air sensor wiring or the connector. Did you complete the repair?System OK
4Replace the ambient air sensor Did you complete the replacement?System OK
5Turn the ignition to ON. Measure the voltage between the two terminals in the ambient air sensor connector on the front bumper harness. Is the voltage measured greater than or equal to the specified value?2.2 VGo to Step 7Go to Step 6
6Connect the in-car sensor to the controller. Turn the ignition switch to ON. Observe the temperature display area. Does this display indicate the continuing presence of a DTC 2 condition?Go to Step 8System OK
7Pull the automatic temperature control (ATC) controller from the instrument panel, leaving the wiring harness connected. Measure the voltage between terminals A13 and B8 for the hatchback and between terminals A9 and A20 for the notchback by backprobing the connectors. Is the voltage measured less than or equal to the specified value?2.2 VGo to Step 8Go to Step 9
8Replace the ATC Controller. Did you complete the replacement?System OK
9Test the wiring for the ambient air sensor from the ATC controller, through connectors C209, C208, C202 and C303 for the hatchback or through connectors C207 and C217 for the notchback to the ambient air sensor connector on the front bumper harness. Repair any open or high resistance condition in the wiring or a connector terminal. Did you find and correct the condition?System OK

This DTC code will set if the output of the coolant sensor indicates a probable short circuit or an open in the sensor or the associated wiring harness, or a malfunction of the automatic temperature control (ATC) controller.

StepActionValue(s)YesNo
1Disconnect the coolant temperature sensor connector from the automatic temperature control (ATC) harness. Inspect the wiring from the sensor to the connector and examine the connector for any signs of damage. Measure the resistance between the coolant temperature sensor connector terminals. Is there any sign of damage in the wiring or connector, or is the resistance measured outside the specified range at 25°C (77°F)?2.2K ohms ± 3%Go to Step 2Go to Step 3
2Repair the damaged wiring or the connector, or replace the coolant temperature sensor as required. Did you find and correct the condition?System OK
3Turn the ignition to ON. Measure the voltage between the two coolant temperature sensor connector terminals on the ATC harness. Is the voltage equal to the specified value at 40°C (104°F) and 50°C (122°F)?40°C (104°F)@ 3.7 V 50°C (122°F)@ 2.9 VGo to Step 7Go to Step 4
4Inspect the terminals on the coolant temperature sensor connector. Is any problem found with the connector?Go to Step 5Go to Step 6
5Repair the connector terminals or replace the coolant temperature sensor or ATC controller as required. Did you find and correct the condition?System OK
6Connect the coolant temperature sensor to the ATC harness. Turn the ignition switch to ON. Observe the temperature display area. Does this display indicate the continuing presence of a code 3 condition?Go to Step 9System OK
7Pull the ATC controller from the instrument panel, leaving the wiring harness connected. Measure the voltage between terminals A13 and B9 for hatchback or terminals A16 and A20 for notchback by backprobing the connectors. Is the voltage measured less than or equal to the specified value?40°C (104°F)@ 3.7 V 50°C (122°F)@ 2.9 VGo to Step 9Go to Step 8
8Test the wiring from controller terminals A13 and B9 to the coolant temperature sensor connector terminals on the ATC harness connectors. Repair any open or high resistance found in the wiring or connector terminals. Did you find and correct the condition?System OK
9Replace the ATC controller. Did you complete the replacement?System OK

This code will set if the output of the mix door indicator indicates that the door opening angle is out of range or does not change value when the door should be moving. This would indicate a short circuit or an open in the sensor or the associated wiring harness, a door motor that is not operating, or a malfunction of the automatic temperature control (ATC) controller.

StepActionValue(s)YesNo
1Disconnect the instrument panel (I/P) wiring harness connector from the air mix door (AMD) motor. Use an ohmmeter to measure the resistance between terminals 5 and 7 on the hatchback or 1 and 2 on the notchback on the AMD motor. Does the measured resistance indicate an open or a shorted condition?Open=infinity, short= 0ohmsGo to Step 4Go to Step 2
2Measure the voltage between terminals 2 and 3 on the hatchback or 1 and 2 on the notchback on the AMD motor. Is the resistance measured equal to the specified value?13.5 vGo to Step 3Go to Step 4
3Measure the resistance between terminals 6 and 2 and between terminals 6 and 3 on the AMD motor for the hatchback or measure the voltage between terminals 3 of the AMD and terminal A15 on the ATC for the notchback. Do these measurements equal to the values specified?3000 ohms for the hatchback or 6.0 ± 0.5v for the notchbackGo to Step 5Go to Step 4
4Replace the AMD motor. Did you complete the replacement?System OK
5Inspect the connector terminals at the AMD motor and the wiring in the ATC harness. Is there a problem with any terminal on either the harness connector or the motor connector or the wiring?Go to Step 6Go to Step 7
6Repair the problem found with a connector terminal or the wiring, or replace the motor as required. Did you find and correct the condition?System OK
7Remove the ATC controller from the instrument panel. Disconnect the harness connectors from the ATC controller. Inspect the connector terminals on the harness connectors and the controller connectors and the harness wiring. Is there a problem with any of these connectors or the wiring?Go to Step 8Go to Step 9
8Repair the problem found with a connector terminal or wiring. Did you complete the repair?System OK
9Measure continuity in the harness between the controller connectors and the following AMD motor connectors: Controller terminal A2 to motor terminal 7 Controller terminal A8 to motor terminal 5 Controller terminal B6 to motor terminal 2 Controller terminal B5 to motor terminal 6 Controller terminal B4 to motor terminal 3 For the hatchback or the following continuity checks for the notchback. Controller terminal B8 to motor terminal 1. Controller terminal A15 to motor terminal 3. Does the continuity equal the specified value?0 ohmsGo to Step 10Go to Step 11
10Repair the continuity problem. Did you complete the repair?System OK
11Connect the AMD motor to the ATC harness. Connect the ATC harness connectors to the controller. Turn the ignition to ON. Use backprobing for voltage measurements. Measure the voltage between ground and terminal B5 at the controller. Is the voltage measured less than or equal to the specified value?4 VGo to Step 12Go to Step 14
12Set the temperature controller to 18°C (64°F). Connect a voltmeter between ground and terminal A8 at the controller. It should display about 12 V. Raise the temperature setting on the controller to 32°C (90°F). Does the voltage equal the specified value?12 V to 0 VGo to Step 13Go to Step 15
13Connect a voltmeter between ground and terminal A2 at the controller. It should display about 12 V. Change the temperature setting to 18°C (64°F). Does the voltage equal the specified value?12 V to 0 VGo to Step 20Go to Step 15
14Inspect the wiring harness and the connector terminals associated with controller terminals B4, B5, and B6, and AMD motor terminals 2, 6, and 3. Repair any problem found. Did you complete the repair?System OK
15Inspect all wiring circuits between the controller and the AMD motor. Is there a problem in the wiring or the connectors?Go to Step 16Go to Step 17
16Repair the condition in the wiring between the ATC controller and the AMD motor. Did you complete the repair?System OK
17Inspect the AMD motor. Is there a problem in the AMD motor?Go to Step 18Go to Step 19
18Replace the AMD motor. Did you complete the replacement?System OK
19Replace the controller. Did you complete the replacement?System OK
20Observe the operation of the air mix door when the temperature setting is changed. Does the door move normally?Go to Step 22Go to Step 21
21Repair or replace the air mix door. Did you find and correct the condition?System OK
22Observe the operation of the AMD motor when the temperature setting is changed. Does the motor operate normally?Go to Step 24Go to Step 23
23Replace the AMD motor. Did you complete the replacement?System OK
24Connect everything and test the system. Does DTC 4 reset?Go to Step 25System OK
25Replace the controller. Did you complete the replacement?System OK

This code will set if the output of the sun sensor indicates a probable short circuit or an open in the sensor or the associated wiring harness, or a malfunction of the automatic temperature control (ATC) controller.

StepActionValue(s)YesNo
1Lift the sun sensor from the top of the dash panel. Secure the ATC harness below the sun sensor connector so it cannot fall through the opening in the top of the dash panel. Disconnect the sun sensor connector from the automatic temperature control (ATC) harness. Inspect the wiring from the sensor to the connector, and examine the connector for any signs of damage. Measure the resistance between the sun sensor connector terminals. Is there any sign of damage in the wiring or connector or does the resistance measured equal the value specified?0 ohmsGo to Step 2Go to Step 3
2Repair the damaged wiring or the connector, or replace the sun sensor as required. Did you find and correct the condition?System OK
3Turn the ignition to ON. Measure the voltage between the 2 sun sensor connector terminals on the ATC harness. Is the voltage measured less than or equal to the specified value?2.5-4.8 VGo to Step 7Go to Step 4
4Inspect the terminals on the sun sensor connector. Is any problem found with the connector?Go to Step 5Go to Step 6
5Repair the connector terminals or replace the sun sensor or ATC controller as required. Did you find and correct the condition?System OK
6Reconnect the sun sensor to the ATC harness. Turn the ignition switch to ON. Observe the temperature display area. Does this display indicate the continuing presence of a code 5 condition?Go to Step 9System OK
7Pull the ATC controller from the instrument panel, leaving the wiring harness connected. Measure the voltage between terminals A13 and B10 for the hatchback or terminals A19 and A20 for the notchback by backprobing the connectors. Is the voltage measured less than or equal to the specified value?2.5-4.8 VGo to Step 9Go to Step 8
8Test the wiring from controller terminals A13 and B10 for the hatchback or terminals A19 and A20 for the notchback to the sun sensor connector terminals on the ATC harness connectors. Repair any open or high resistance found in the wiring or connector terminals. Did you find and correct the condition?System OK
9Replace the ATC controller. Did you complete the replacement?System OK

Symptoms - HVAC Systems - Automatic

IMPORTANTThe following steps must be completed before using the symptom tables.
  1. Perform the «Diagnostic Trouble Code (DTC) List - Vehicle»(/chevrolet/aveo/i-2006-2012/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-trouble-code-dtc-list) before using the symptom tables in order to verify that all of the following are true: There are no DTCs set. The control module(s) can communicate via the serial data link.
  2. Review the system operation in order to familiarize yourself with the system functions. Refer to «Automatic HVAC Description and Operation»(/chevrolet/aveo/i-2006-2012/remont/automatic-hvac-system/#hvac-system-automatic) .

Visual/Physical Inspection

  1. Inspect for aftermarket devices which could affect the operation of the HVAC System. Refer to «Checking Aftermarket Accessories»(/chevrolet/aveo/i-2006-2012/remont/body-electrical/#wiring-systems-and-power-management-inline-harness-connector-end-views-diagnosis__checking-aftermarket-accessories) .
  2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
  3. Verify the A/C compressor clutch turns freely and is not seized.
  4. Verify that the customer is using the correct key to enable personalization and is not inadvertently activating auxiliary HVAC controls.
  5. The following conditions may cause window fogging: Wet carpet or mats High humidity Interior water leak Blocked A/C evaporator drain tube Maximum passenger capacity Blocked body pressure relief valves
  6. Inspect the air distribution system for causes of reduced air flow: Obstructed or dirty passenger compartment air filter, if equipped Blocked or damaged air inlet or outlet vents

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections .

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

  1. «Blower Motor Inoperative»(/chevrolet/aveo/i-2006-2012/remont/automatic-hvac-system/#hvac-system-automatic__blower-motor-inoperative)
  2. «Too Hot in Vehicle»(/chevrolet/aveo/i-2006-2012/remont/automatic-hvac-system/#hvac-system-automatic__too-hot-in-vehicle)
  3. «Too Cold in Vehicle»(/chevrolet/aveo/i-2006-2012/remont/automatic-hvac-system/#hvac-system-automatic__too-cold-in-vehicle)
  4. «Control Head Inoperative»(/chevrolet/aveo/i-2006-2012/remont/automatic-hvac-system/#hvac-system-automatic__control-head-inoperative)

Blower Motor Inoperative

StepActionValuesYesNo
1Turn ON the ignition. Observe the temperature indication screen of the controller. Does the digit flash?Go to Step 2Go to Step 3
2Run a self-diagnosis circuit check. Does the display indicate a defect code?Go to appropriate DTC table
3Turn ON the ignition. Measure the voltage between ground and terminal 2 of the blower motor. Does the voltage measure within the specified value?11-14 VGo to Step 4Go to Step 5
4Measure the voltage between ground and terminal B12 at the ACT switch. Does the voltage measure within the specified value?11-14 VGo to Step 6Go to Step 12
5Repair any problem found in terminal 2 at the blower motor circuit or ground G203. Did you complete the repair?System OK
6Measure the resistance between the connector terminals on the blower motor. Does the resistance measure equal to the specified value?5 ohmsGo to Step 8Go to Step 7
7Replace the blower motor. Did you complete the repair?System OK
8Turn OFF the ignition. Using an ohmmeter, measure the resistance between terminal 1 of the blower motor and terminal 2 of the power transistor. Does the resistance measure equal to the specified value?0 ohmsGo to Step 10Go to Step 9
9Repair the circuit between terminal 1 of the blower motor and terminal 2 of the power transistor. Did you complete the repair?System OK
10Measure the resistance between terminal 2 of the power transistor connector to ground Does the resistance measure equal to the specified value?0 ohmsGo to Step 11Go to Step 12
11Trace the circuit from terminal 2 of the power transistor connector to ground G203. Repair any problem found in the circuit to ground G203. Did you complete the repair?System OK
12Replace the ATC controller. Did you complete the repair?System OK

Too Hot in Vehicle

StepActionYesNo
1Did you perform the Diagnostic System Check - Vehicle?Go to Step 2Go to Diagnostic Trouble Code (DTC) List - Vehicle
2Observe the blower motor operation. Is the blower motor functioning at all?Go to Step 3Go to Blower Motor Inoperative
3Use the blower push switch to cycle the blower through its different speeds. Does the motor function at different speeds?Go to Step 4Go to Blower Motor Inoperative
4Run the blower and the operate the MODE push switch manually. Inspect for airflow out the various outlets. Does the air flow from the different outlets as it should?Go to Step 6Go to Step 5
5Remove the heater outlet and inspect for obstructions. Remove any obstructions found. Is the heater operating?System OKGo to Step 8
6Observe the air mix door motor (AMD) while changing the temperature setting from 18-32°C (64-90°F) and then from 32-18°C (90-64°F). Is the AMD motor functioning properly?Go to Step 7Go to DTC 4
7Perform the checks found in HVAC preliminary checks. Refer to HVAC Preliminary Checks . Is the system operating normally now?System OKGo to Step 8
8Place the controller in the AUTO mode. Inspect for airflow through the inside air temperature assembly by placing a 5 cm (2 in) square piece of paper over the sensor air inlet. Does the paper stay in place?Go to Step 11Go to Step 9
9Inspect the intake hose for the in-car sensor. Is the hose in good condition?Go to Step 11Go to Step 10
10Repair or replace the intake hose. Is the repair complete?System OK
11Inspect the in-car sensor. Refer to DTC 1 . Is there a problem indicated in the sensor, the sensor wiring, or the controller?Go to Step 12Go to Step 13
12Repair or replace the sensor, the wiring, or the controller as required. Is the repair complete?System OK
13Inspect the ambient air temperature sensor. Refer to DTC 2 . Is there a problem indicated in the sensor, the sensor wiring, or the controller?Go to Step 14Go to Step 15
14Repair or replace the sensor, the wiring, or the controller, as required. Is the repair complete?System OK
15Inspect the sun sensor. Refer to DTC 5 . Is there a problem indicated in the sensor, the sensor wiring, or the controller?Go to Step 14Go to Step 16
16Perform the coolant temperature sensor test. Is the coolant temperature sensor malfunctioning?Go to Step 17Go to Step 18
17Replace the coolant temperature sensor. Is the repair complete?System OK
18Replace the air temperature controller (ATC). Refer to Heater and Air Conditioning Control Replacement . Is the repair complete?System OK

Too Cold in Vehicle

StepActionYesNo
1Did you perform the Diagnostic System Check - Vehicle?Go to Step 2Go to Diagnostic Trouble Code (DTC) List - Vehicle
2Inspect the coolant level. Is the coolant level correct?Go to Step 4Go to Step 3
3Add coolant as needed. Did you correct the condition?System OK
4Observe the blower motor operation. Is the blower motor functioning at all?Go to Step 5Go to Blower Motor Inoperative
5Use the blower push switch to cycle the blower through its different speeds. Does the motor function at different speeds?Go to Step 6Go to Blower Motor Inoperative
6Run the blower and operate the MODE push switch manually. Check for airflow out the various outlets. Does the air flow from the different outlets as it should?Go to Step 8Go to Step 7
7Remove the heater outlet and inspect for obstructions. Remove any obstructions found. Is the heater operating?System OKGo to Step 8
8Observe the air mix door (AMD) motor while changing the temperature setting from 18-32°C (64-90°F) and then from 32-18°C (90-64°F). Is the AMD motor adjusting to temperature properly?Go to Step 9Go to DTC 4
9Inspect the coolant hoses for leaks or kinks. Are the coolant hoses in good condition?Go to Step 11Go to Step 10
10Repair any problem with the coolant hoses. Is the heater operating?System OKGo to Step 11
11Inspect the surge tank cap. Is the surge tank cap in good condition?Go to Step 13Go to Step 12
12Repair or replace the surge tank cap as needed. Is the heater operating?System OKGo to Step 13
13Set the A/C switch to OFF. Set the temperature control to 32°C (90°F). Set the blower motor speed to full high, all segments illuminated on the display. Remove the surge tank cap. Start the vehicle and run the engine at idle. Watch for the flow of the coolant when the thermostat opens. Does the coolant flow?Go to Step 15Go to Step 14
14Inspect for the following conditions: A faulty thermostat A failed coolant pump impeller A restriction in the cooling system Make repairs as needed. Is the repair complete?System OK
15Inspect the temperature of the heater inlet and outlet hoses by feel. Is the heater inlet hose hot and the outlet hose warm?Go to Step 17Go to Step 16
16Back flush or replace the heater core. Is the repair complete?System OK
17Inspect the vehicle for cold air leaks at the following locations: Dash Heater cases Vents Are any leaks found?Go to Step 19Go to Step 18
18Repair any cold air leaks. Is the repair complete?System OK
19Inspect the coolant temperature sensor. Is there a problem indicated in the sensor, the sensor wiring or the controller?Go to Step 20Go to Step 21
20Repair or replace the sensor, the wiring, or the controller as required. Is the repair complete?System OK
21Inspect the in-car sensor. Refer to DTC 1 . Is there a problem indicated in the sensor, the sensor wiring, or the controller?Go to Step 20Go to Step 22
22Inspect the ambient air temperature sensor. Refer to DTC 2 . Is there a problem indicated in the sensor, the sensor wiring, or the controller?Go to Step 20Go to Step 23
23Inspect the sun sensor. Refer to DTC 5 . Is there a problem indicated in the sensor, the sensor wiring, or the controller?Go to Step 20Go to Step 24
24Replace the automatic temperature controller (ATC). Refer to Heater and Air Conditioning Control Replacement . Is the repair complete?System OK

Control Head Inoperative

StepActionValuesYesNo
1Check the fuse F19. Is the fuse open?Go to Step 2Go to Step 3
2Repair any short circuit and replace the open fuses. Did you complete the repair?System OK
3Remove the controller. Turn ON the ignition. Measure the voltage between terminal B2 and B3 of the connectors. Does the voltage measure within the specified value?11-14 VGo to Step 4Go to Step 5
4Inspect the connector and controller for damages. Repair the damaged parts or replace the controller. Did you complete the repair?System OK
5Measure the voltage between terminal B13 of the connector and ground. Does the resistance measure equal to the specified value?0 VGo to Step 6Go to Step 7
6Inspect the wiring harness between fuse F19 and the terminal B2 for damage. Replace the wiring harness if it is damaged. Did you complete the repair?System OK
7Inspect the wiring harness between terminal B3 and ground G203 for damage. Repair the wiring harness, or ground connection as required. Did you complete the repair?System OK

Removal Procedure

  1. Disconnect the negative battery cable.
  2. Remove the audio system trim molding.
  3. Remove the lower HVAC control assembly trim molding.
  4. Remove the HVAC control assembly screws.
  5. Disconnect the electrical connectors.
  6. Remove the HVAC control assembly.

Installation Procedure

  1. Connect the electrical connectors.
  2. Position the HVAC control assembly on the center molding and install the retaining screws and tighten to 2 N.m (18 lb in).
  3. Install the audio trim panel.
  4. Connect the negative battery cable.
  1. Disconnect the negative battery cable.
  2. Remove the instrument panel assembly. Refer to «Instrument Panel Assembly Replacement (Notchback)»(/chevrolet/aveo/i-2006-2012/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim) or «Instrument Panel Assembly Replacement (Hatchback)»(/chevrolet/aveo/i-2006-2012/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim) .
  3. Disconnect the electrical connector.
  4. Remove the motor retaining screws.
  5. Remove the motor.
  1. Install the motor.
  2. Install the motor retaining bolts and tighten.
  3. Connect the electrical connector.
  4. Install the instrument panel assembly. Refer to «Instrument Panel Assembly Replacement (Notchback)»(/chevrolet/aveo/i-2006-2012/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim) or «Instrument Panel Assembly Replacement (Hatchback)»(/chevrolet/aveo/i-2006-2012/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim)
  5. Connect the negative battery cable.
  1. Disconnect the negative battery cable.
  2. Remove the heater core cover. Refer to «Heater Core Replacement (Hatchback)»(/chevrolet/aveo/i-2006-2012/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) or «Heater Core Replacement (Notchback)»(/chevrolet/aveo/i-2006-2012/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
  3. Disconnect the electrical connector.
  4. Remove the sensor retaining screws.
  5. Remove the sensor from the heater core pipe.
  1. Install the sensor with the retaining screws and tighten.
  2. Connect the electrical connector.
  3. Install the heater core cover. Refer to «Heater Core Replacement (Hatchback)»(/chevrolet/aveo/i-2006-2012/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) or «Heater Core Replacement (Notchback)»(/chevrolet/aveo/i-2006-2012/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
  4. Connect the negative battery cable.
  1. Disconnect the negative battery cable.
  2. Remove the instrument panel assembly. Refer to «Instrument Panel Assembly Replacement (Notchback)»(/chevrolet/aveo/i-2006-2012/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim) or «Instrument Panel Assembly Replacement (Hatchback)»(/chevrolet/aveo/i-2006-2012/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim) .
  3. Disconnect the electrical connector.
  4. Remove the motor actuating rod by snapping out it out of the lever with needle-nose pliers.
  5. Remove the motor retaining bolts.
  6. Remove the mode door motor.
  1. Install the mode door motor.
  2. Install the motor retaining screws and tighten.
  3. Install the actuating rod.
  4. Connect the electrical connector.
  5. Install the instrument panel assembly. Refer to «Instrument Panel Assembly Replacement (Notchback)»(/chevrolet/aveo/i-2006-2012/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim) or «Instrument Panel Assembly Replacement (Hatchback)»(/chevrolet/aveo/i-2006-2012/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim) .
  6. Connect the negative battery cable.
  1. Disconnect the negative battery cable.
  2. Remove the instrument panel assembly. Refer to «Instrument Panel Assembly Replacement (Notchback)»(/chevrolet/aveo/i-2006-2012/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim) or «Instrument Panel Assembly Replacement (Hatchback)»(/chevrolet/aveo/i-2006-2012/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim) .
  3. Disconnect the electrical connector.
  4. Remove the actuating rod by snapping it out of the lever with needle-nose pliers.
  5. Remove the air temperature actuator retaining screws.
  6. Remove the air temperature actuator.
  1. Install the air temperature actuator.
  2. Install the retaining screws and tighten.
  3. Install the actuating rod.
  4. Connect the electrical connector.
  5. Install the instrument panel assembly. Refer to «Instrument Panel Assembly Replacement (Notchback)»(/chevrolet/aveo/i-2006-2012/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim) or «Instrument Panel Assembly Replacement (Hatchback)»(/chevrolet/aveo/i-2006-2012/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim) .
  6. Connect the negative battery cable.
  1. Disconnect the negative battery.
  2. Remove the evaporator core. Refer to «Air Conditioning Evaporator Core Replacement»(/chevrolet/aveo/i-2006-2012/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
  3. Remove the intake sensor with the connector.
  1. Install the intake sensor with the connector.
  2. Install the evaporator core. Refer to «Air Conditioning Evaporator Core Replacement»(/chevrolet/aveo/i-2006-2012/remont/automatic-hvac-system/#heating-ventilation-and-air-conditioning) .
  3. Connect the negative battery.
  1. Disconnect the negative battery cable.
  2. Remove the front bumper. Refer to «Front Bumper Fascia Replacement (Hatchback)»(/chevrolet/aveo/i-2006-2012/remont/exterior-body-panels/#bumper-system-fascia) or «Front Bumper Fascia Replacement (Notchback)»(/chevrolet/aveo/i-2006-2012/remont/exterior-body-panels/#bumper-system-fascia) .
  3. Disconnect the ambient air temperature sensor electrical connector.
  4. Remove the ambient air temperature sensor from the bracket.
  1. Install the ambient air temperature sensor into its bracket.
  2. Connect the electrical connector.
  3. Install the front bumper. Refer to «Front Bumper Fascia Replacement (Hatchback)»(/chevrolet/aveo/i-2006-2012/remont/exterior-body-panels/#bumper-system-fascia) or «Front Bumper Fascia Replacement (Notchback)»(/chevrolet/aveo/i-2006-2012/remont/exterior-body-panels/#bumper-system-fascia)
  4. Connect the negative battery cable.
  1. Disconnect the negative battery cable.
  2. Remove the instrument panel assembly. Refer to «Instrument Panel Assembly Replacement (Notchback)»(/chevrolet/aveo/i-2006-2012/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim) or «Instrument Panel Assembly Replacement (Hatchback)»(/chevrolet/aveo/i-2006-2012/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim)
  3. Disconnect the electrical connector.
  4. Remove the retaining screws.
  5. Remove the air inlet tube.
  6. Remove the inside air temperature sensor.
  1. Install the inside air temperature sensor with the retaining screws and tighten.
  2. Install the air inlet tube and connect the electrical connector.
  3. Install instrument panel assembly. Refer to «Instrument Panel Assembly Replacement (Notchback)»(/chevrolet/aveo/i-2006-2012/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim) or «Instrument Panel Assembly Replacement (Hatchback)»(/chevrolet/aveo/i-2006-2012/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim)
  4. Connect the negative battery cable.
  1. Disconnect the negative battery cable.
  2. Gently pry up on the sun load sensor to remove it.
  3. Secure the electrical connector to prevent it from falling beneath the dash.
  4. Disconnect the electrical connector and remove the sun load sensor.
  1. Connect the electrical connector.
  2. Insert and press the sun load sensor into position in the dash.
  3. Connect the negative battery cable.

Controller

The operation of the A/C system is controlled by the switches on the control head. This console-mounted heating and ventilation system consists of control knobs and a vacuum fluorescent display (VFD) indicating the status of the control settings selected.

Temperature Control Push Knobs

  1. Raise the temperature of the air entering the vehicle by turning the rotary switch clockwise (red arrow direction).
  2. Lower the temperature of the air entering the vehicle by turning the switch counterclockwise (blue arrow direction).
  3. Actuate the air mix door by an electric motor.
  4. Vary the mix of the air passing through the heater core with the air bypassing the core.
  5. Each press of a switch changes the set temperature by increments of 0.5°C (1°F). This is shown in the temperature window on the function display.

Vacuum Fluorescent Display (VFD)

  1. Temperature setting-Indicates the temperature set with temperature control knob.
  2. Auto status-Indicated whether the system is operating in the full automatic mode or manual mode.
  3. Defroster icon-Indicates manual selection of full defrost mode.
  4. Mode-Indicated by icon, the mode chosen by the system in auto (or by the operator in manual) is shown by an illumination arrow indicating the air path.
  5. A/C-A snowflake icon indicating whether the A/C is ON or OFF.
  6. Fan speed-Indicates the fan speed by illuminating a bar based on the segment at the front, for low speed, and adding additional segments in order up to the eighth, for high speed.

Seven Additional Push Knobs

  1. Full defrost-Causes the mode motors to direct all air to the windshield and aide window outlets for maximum defrosting.
  2. Air intake-Switches between fresh air intake, the default, and recirculating air. Airflow arrows on the display indicate the mode in effect.
  3. Full auto switch-Maintains the set temperature automatically. In this mode, the fully automatic temperature control (FATC) system controls the following: The air mix door motor The mode door motor The blower motor speed The inlet air door motor A/C ON/OFF
  4. OFF switch-Turns the automatic air conditioning and fan control off.
  5. Mode switch-Allows manual selection of the airflow direction. Selection is shown on the function display. Each time the mode switch is pressed, the next function is displayed.
  6. A/C switch-Allows manual selection and control of the air conditioning function.
  7. Defogger switch-Turns ON the electric defogging heater in the rear window and the outside rearview mirrors, if the vehicle is equipped with heated mirrors.
  8. Fan control rotary knob-Allows for manual selection of the fan speed.

Pressure Transducer

Pressure transducer switching incorporates the functions of the high-pressure and the low-pressure cutout switches along with the fan cycling switch. The pressure transducer is located in the high-side liquid refrigerant line behind the right strut tower, between the right strut tower and the front of dash. The output from this pressure transducer goes to the electronic control module (ECM), which controls the compressor function based on the pressure signal.

Wide-Open Throttle (WOT) Compressor Cutoff

During full-throttle acceleration, the throttle position (TP) sensor sends a signal to the ECM, which then controls the compressor clutch.

High RPM Cutoff

As engine RPM approached the maximum limit, the ECM will disengage the compressor clutch until the engine slows the a lower RPM.

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