Automatic Air Conditioner: Overview Nissan 350Z I

Description

1. One-touch joints are pipe joints which do not require tools during piping connection.
2. Unlike conventional connection methods using union nuts and flanges, controlling tightening torque at connection point is not necessary.
3. When removing a pipe joint, use a disconnector.

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Note. Garter spring cannot be removed from cage of male-side piping. Indicator ring remains near piping connection point, however, this is not a problem. (This is to check piping connection during factory assembly.)

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1. Clean piping connection point, and set a disconnector.
2. Slide disconnector in axial direction of piping, and stretch garter spring with tapered point of disconnector.
3. Slide disconnector farther so that inside diameter of garter spring becomes larger than outside diameter of female-side piping flare. Then male-side piping can be disconnected.

Scheme 4

1. Clean piping connection points, and insert male-side piping into female-side piping.
2. Push inserted male-side piping harder so that female-side piping flare stretches garter spring.
3. If inside diameter of garter spring becomes larger than outside diameter of female-side piping flare, garter spring seats on flare. Then, it fits in between male-side piping cage and female-side piping flare to anchor piping connection point.

Note. When garter spring seats on flare, and fits in between male-side piping cage and female-side piping flare, it clicks.

Note. One-touch joint connection is used in points below. Low-pressure flexible hose to evaporator (O-ring size: 16) High-pressure flexible hose to condenser (O-ring size: 12) High-pressure pipe 1 to evaporator (O-ring size: 8) High-pressure pipe 1 to condenser (O-ring size: 8)

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1. The O-ring has been relocated. It has also been provided with a groove for proper installation. This eliminates the chance of the O-ring being caught in, or damaged by, the mating part. The sealing direction of the O-ring is now set vertically in relation to the contacting surface of the mating part to improve sealing characteristics.
2. The reaction force of the O-ring will not occur in the direction that causes the joint to pull out, thereby facilitating piping connections.

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1. When the compressor is removed, store it in the same position as it is when mounted on the car. Malfunction to do so will cause lubricant to enter the low pressure chamber.
2. When connecting tubes, always use a torque wrench and a back-up wrench.
3. After disconnecting tubes, immediately plug all openings to prevent entry of dirt and moisture.
4. When installing an air conditioner in the vehicle, connect the pipes as the final stage of the operation. Do not remove the seal caps of pipes and other components until just before required for connection.
5. Allow components stored in cool areas to warm to working area temperature before removing seal caps. This prevents condensation from forming inside A/C components.
6. Thoroughly remove moisture from the refrigeration system before charging the refrigerant.
7. Always replace used O-rings.
8. When connecting tube, apply lubricant to circle of the O-rings shown in illustration. Be careful not to apply lubricant to threaded portion.
9. Lubricant name: Nissan A/C System Oil Type S
10. Part number: KLH00-PAGS0
11. O-ring must be closely attached to dented portion of tube.
12. When replacing the O-ring, be careful not to damage O-ring and tube.
13. Connect tube until you hear it click, then tighten the nut or bolt by hand until snug. Make sure that the O-ring is installed to tube correctly.
14. After connecting line, conduct leak test and make sure that there is no leakage from connections. When the gas leaking point is found, disconnect that line and replace the O-ring. Then tighten connections of seal seat to the specified torque.

IDENTIFICATION

Note. Vehicles with factory installed fluorescent dye have a green label.

Vehicles without factory installed fluorescent dye have a blue label.

IDENTIFICATION LABEL FOR VEHICLE

Vehicles with factory installed fluorescent dye have this identification label on the front side of hood.

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GENERAL INFORMATION

1. The V-6 variable compressor differs from previous units. The vent temperatures of the V-6 variable compressor do not drop too far below 5°C (41°F) when: Evaporator intake air temperature is less than 20°C (68°F). Engine is running at speeds less than 1,500 RPM. This is because the V-6 compressor provides a means of "capacity" control.
2. The V-6 variable compressor provides refrigerant control under varying conditions. During cold winters, it may not produce high refrigerant pressure discharge (compared to previous units) when used with air conditioning systems.
3. A "clanking" sound may occasionally be heard during refrigerant charge. The sound indicates that the tilt angle of the wobble (swash) plate has changed and is not a problem.
4. For air conditioning systems with the V-6 compressor, the clutch remains engaged unless: the system main switch, fan switch or ignition switch is turned OFF. When ambient (outside) temperatures are low or when the amount of refrigerant is insufficient, the clutch is disengaged to protect the compressor.
5. A constant range of suction pressure is maintained when engine speed is greater than a certain value. It normally ranges from 147 to 177 kPa (1.5 to 1.8 kg/cm 2 , 21 to 26 psi) under varying conditions. In previous compressors, however, suction pressure was reduced with increases in engine speed.

LUBRICANT RETURN OPERATION

Adjust the lubricant quantity according to the test group shown below.

1. CHECK LUBRICANT RETURN OPERATION Can lubricant return operation be performed? A/C system works properly. There is no evidence of a large amount of lubricant leakage. YES or NO YES: GO TO 2. NO: GO TO 3 .
2. PERFORM LUBRICANT RETURN OPERATION, PROCEEDING AS FOLLOWS: Start engine, and set the following conditions: Test condition Engine speed: Idling to 1,200 RPM A/C or AUTO switch: ON Blower speed: Max. position Temp. control: Optional [Set so that intake air temperature is 25 to 30°C (77 to 86°F).] Intake position: Recirculation (REC) Perform lubricant return operation for about 10 minutes. Stop engine. CAUTION: If excessive lubricant leakage is noted, do not perform the lubricant return operation. GO TO 3.
3. CHECK COMPRESSOR Should the compressor be replaced? YES or NO YES: Go to " «LUBRICANT ADJUSTING PROCEDURE FOR COMPRESSOR REPLACEMENT»(ref-184466-S07358046382005082600000) ". NO: GO TO 4.
4. CHECK ANY PART Is there any part to be replaced? (Evaporator, condenser, liquid tank or in case there is evidence of a large amount of lubricant leakage.) YES or NO YES: Go to " «LUBRICANT ADJUSTING PROCEDURE FOR COMPONENTS REPLACEMENT EXCEPT COMPRESSOR»(ref-184466-S07358046382005082600000) ". NO: Carry out the A/C performance test.

Description of Air Conditioner LAN Control System

The LAN (Local Area Network) system consists of unified meter and A/C amp. (auto amp.), mode door motor, air mix door motor and intake door motor.

A configuration of these components is shown in the diagram. (Scheme 10)

Scheme 10

OPERATION

The unified meter and A/C amp. (auto amp.) receives data from each of the sensors. The amplifier, sends mode door, air mix door and intake door opening angle data to the mode door motor LCU, air mix door motor LCU and intake door motor LCU.

The mode door motor, air mix door motor and intake door motor read their respective signals according to the address signal. Opening angle indication signals received from the unified meter and A/C amp. (auto amp.) and each of the motor position sensors are compared by the LCUs in each motor with the existing decision and opening angles. Subsequently, HOT/COLD, DEFROST/VENT or FRESH/RECIRCULATION operation is selected. The new selection data is returned to the unified meter and A/C amp. (auto amp.).

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Description of Control System

The control system consists of input sensors, switches, unified meter and A/C amp. (auto amp; microcomputer) and outputs.

The relationship of these components is shown in the diagram below

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CAN Communication System Description

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only.

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1. Type 1

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1. Type2
2. Type3

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1. Type 4
2. Type 5

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1. Type 6
2. Type 7

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The self-diagnostic system diagnoses sensors, door motors, blower motor, etc. by system line. Self-diagnosis is step 1 to 7. (Scheme 28) There are two ways of changing method during self-diagnosis.

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1. Switching to self-diagnosis step 1 to 4. Shifting from normal control to the self-diagnostic system is accomplished by starting the engine (turning the ignition switch from OFF to ON) and pressing A/C switch for at least 5 seconds. The "A/C" switch must be pressed within 10 seconds after starting the engine (ignition switch is turned ON). This system will be canceled by either pressing intake switch or turning the ignition switch OFF. Shifting from one step to another is accomplished by means of turning fan control dial, as required.
2. Switching to self diagnosis steps 5 to 7 (Auxiliary mechanism). Shifting from normal control to the self-diagnostic system is accomplished by starting the engine (turning the ignition switch from OFF to ON) and pressing intake switch for at least 5 seconds. The "intake" switch must be pressed within 10 seconds after starting the engine (ignition switch is turned ON). This system will be canceled by either pressing A/C switch or turning the ignition switch OFF. Shifting from one step to another is accomplished by means of turning fan control dial, as required.

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1. SET IN SELF-DIAGNOSTIC MODE (STEP 1 TO 4) Set the fan control dial to OFF position. Turn ignition switch ON. Set in self-diagnostic mode as follows. Within 10 seconds after starting engine (ignition switch is turned ON.), press A/C switch for at least 5 seconds. CAUTION: If battery voltage drops below 12V during step diagnosis 3, actuator speed becomes slower and as a result, the system may generate an error even when operation is usual. To avoid this, start engine before performing this diagnosis. GO TO 2.
2. STEP 1 - LEDS AND DISPLAY ARE CHECKED Check LED illumination. OK or NG OK: GO TO 3. NG: Malfunctioning A/C controller or unified meter and A/C amp. (auto amp.)
3. CHECK TO ADVANCE SELF-DIAGNOSIS STEP 2 Turn fan control dial to AUTO position. Advance to self-diagnosis STEP 2? YES or NO YES: GO TO 4. NO: Malfunctioning fan control dial. Replace A/C controller.
4. CHECK TO RETURN SELF-DIAGNOSIS STEP 1 Turn fan control dial to OFF position. Return to self-diagnosis STEP 1? YES or NO YES: GO TO 5. NO: Replace A/C controller.
5. STEP 2 - SENSOR CIRCUITS ARE CHECKED FOR OPEN OR SHORT CIRCUIT Turn fan control dial to AUTO position. Turn mode control dial to AUTO position. Check A/C switch LED is illuminate. OK or NG OK: GO TO 6. NG: GO TO 9 .
6. STEP 3 - MODE DOOR AND INTAKE DOOR POSITIONS ARE CHECKED Turn fan control dial to 1st-12th speed. Check A/C switch LED is illuminate. OK or NG OK: GO TO 7. NG: GO TO 10 .
7. STEP 4 - OPERATION OF EACH ACTUATOR IS CHECKED Turn fan control dial to 13th-25th speed. Change operation status of air conditioner by changing mode control dial position. GO TO 8.
8. CHECK ACTUATORS Refer to the following chart and confirm discharge air flow, air temperature, blower motor voltage and compressor operation. Checks must be made visually, by listening to any noise, or by touching air outlets with your hand, etc. for improper operation. OK or NG OK: Turn ignition switch OFF or intake switch ON. END NG: Air outlet does not change. Go to Mode Door Motor. See «DIAGNOSTIC PROCEDURE FOR MODE DOOR MOTOR»(ref-184466-S06653779522005082600000) ". Intake door does not change. Go to Intake Door Motor. See " «DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR»(ref-184466-S12227729622005082600000) ". Blower motor operation is malfunctioning. Go to Blower Motor. See " «DIAGNOSTIC PROCEDURE FOR BLOWER MOTOR»(ref-184466-S21247970692005082600000) ". Magnet clutch does not engage. Go to Magnet Clutch. See " «DIAGNOSTIC PROCEDURE FOR MAGNET CLUTCH»(ref-184466-S05992982232005082600000) ". Discharge air temperature does not change. Go to Air Mix Door Motor. See " «DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR»(ref-184466-S40728569052005082600000) ".
9. CHECK MALFUNCTIONING SENSOR Refer to the following chart. 1: Conduct self-diagnosis STEP 2 under sunshine. When conducting indoors, aim a light (more than 60W) at sunload sensor, otherwise LED of A/C switch will not indicate despite that sunload sensor is functioning properly. CAUTION: When switched to STEP 2, LED of REC position blinks for approximately 25 seconds. INSPECTION END
10. CHECK MALFUNCTIONING DOOR MOTOR POSITION SWITCH Mode or (and) intake door motor PBR (s) is (are) malfunctioning. CAUTION: When switched to STEP 2, LED of REC position blinks for approximately 25 seconds. INSPECTION END

Operational Check

The purpose of the operational check is to confirm that the system operates properly.

Conditions: Engine running and at usual operating temperature

System Operation

The unified meter and A/C amp. (auto amp.) receives data from each of the sensors. The amplifier sends air mix door, mode door and intake door opening angle data to the air mix door motor LCU, mode door motor LCU and intake door motor LCU.

The air mix door motor, mode door motor and intake door motor read their respective signals according to the address signal. Opening angle indication signals received from the unified meter and A/C amp. (auto amp.) and each of the motor position sensors are compared by the LCUs in each motor with the existing decision and opening angles. Subsequently, HOT/COLD or DEFROST/VENT or FRESH/RECIRCULATION operation is selected. The new selection data is returned to the unified meter and A/C amp. (auto amp.)

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The unified meter and A/C amp. (auto amp.) receives data from each of the sensors. The amplifier sends air mix door, mode door and intake door motor opening angle data to the air mix door motor LCU, mode door motor LCU and intake door motor LCU.

The air mix door motor, mode door motor and intake door motor read their respective signals according to the address signal. Opening angle indication signals received from the Unified meter and A/C amp. (auto amp.) and each of the motor position sensors are compared by the LCUs in each motor with the existing decision and opening angles. Subsequently, HOT/COLD or DEFROST/VENT or FRESH/RECIRCULATION operation is selected. The new selection data is returned to the unified meter and A/C amp. (auto amp.)

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The intake door control determines intake door position based on the ambient temperature, the intake air temperature and the in-vehicle temperature. When set mode control dial to D/F, D/F2 or DEF position, or OFF switch is pushed, the unified meter and A/C amp. (auto amp.) sets the intake door at the FRESH position.

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SYSTEM DESCRIPTION

Unified meter and A/C amp. (auto amp.) controls compressor operation by ambient temperature and signal from ECM.

COMPONENT DESCRIPTION

The sunload sensor is located on the passenger's side defroster grille. It detects sunload entering through windshield by means of a photo diode. The sensor converts the sunload into a current value which is then input into the Unified meter and A/C amp. (auto amp.)

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Break-in Operation

When replacing compressor clutch assembly, always carry out the break-in operation. This is done by engaging and disengaging the clutch about thirty times. Break-in operation raises the level of transmitted torque.

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1. Remove wiper motor and linkage.
2. Use a refrigerant collecting equipment (for HFC-134a) to discharge the refrigerant.
3. Remove air cleaner assembly and air hose. Refer to «AIR CLEANER AND AIR DUCT»(ref-170482-S13775754652005011000000) .
4. Remove mounting bolt for low-pressure flexible hose bracket.
5. Disconnect one-touch joint between low-pressure flexible hose and low-pressure pipe. Set a disconnector (92530-89916) on A/C piping. Slide a disconnector toward vehicle front until it clicks. Slide A/C piping toward vehicle front and disconnect it.
6. Remove mounting nut from low-pressure flexible hose. (Compressor side) CAUTION: Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air.
7. Remove low-pressure flexible hose.