Nissan GT-R. Manual - part 152

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VENTILATION, HEATER & AIR CONDITIONER

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SECTION 

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CONTENTS

HEATER & AIR CONDITIONING SYSTEM

BASIC INSPECTION  ....................................

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DIAGNOSIS AND REPAIR WORKFLOW  ..........

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Work Flow  .................................................................

2

SYSTEM DESCRIPTION  ..............................

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REFRIGERATION SYSTEM  ...............................

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System Diagram ........................................................

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System Description  ...................................................

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Component Parts Location ........................................

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Component Description .............................................

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SYMPTOM DIAGNOSIS  ...............................

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REFRIGERATION SYSTEM SYMPTOMS  ..........

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Trouble Diagnosis For Unusual Pressure  .................

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Symptom Table  .........................................................

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COMPRESSOR SYSTEM SYMPTOMS .............

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Symptom Table  .......................................................

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PRECAUTION ..............................................

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PRECAUTIONS ..................................................

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Precaution for Supplemental Restraint System 
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" .................................................................

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Precautions Necessary for Steering Wheel Rota-
tion After Battery Disconnection  ..............................

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Precaution for Battery Service  ................................

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Precaution for Procedure without Cowl Top Cover 

....

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General Precautions  ...............................................

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Working with HFC-134a (R-134a)  ...........................

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General Refrigerant Precaution ...............................

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Refrigerant Connection ............................................

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Service Equipment  ..................................................

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COMPRESSOR .................................................

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General Precautions ................................................

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LEAK DETECTION DYE ...................................

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General Precautions ................................................

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PREPARATION ...........................................

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PREPARATION .................................................

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Commercial Service Tool  ........................................

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Sealant or/and Lubricant  .........................................

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PERIODIC MAINTENANCE  ........................

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REFRIGERANT .................................................

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Collection and Charge  .............................................

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REFRIGERATION SYSTEM  .............................

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Inspection ................................................................

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Performance Chart  ..................................................

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Refrigerant Leakages  ..............................................

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FLUORESCENT LEAK DETECTOR  ................

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Inspection ................................................................

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ELECTRICAL LEAK DETECTOR  ....................

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Inspection ................................................................

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< BASIC INSPECTION >

DIAGNOSIS AND REPAIR WORKFLOW

BASIC INSPECTION

DIAGNOSIS AND REPAIR WORKFLOW

Work Flow

INFOID:0000000009160164

OVERALL SEQUENCE

DETAILED FLOW

1.

INTERVIEW FOR MALFUNCTION

Interview the symptom to the customer.

NNIIA0143GB

DIAGNOSIS AND REPAIR WORKFLOW

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< BASIC INSPECTION >

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>> GO TO 2.

2.

SYMPTOM CHECK

Check the symptom from the customer's information. Check that any symptom occurs other than the inter-
viewed symptom.

Insufficient cooling/heating>>GO TO 3.
Refrigerant leakage>>GO TO 6.
Noise >> GO TO 7.

3.

CONTROL SYSTEM DIAGNOSIS

Perform the system diagnosis for the A/C control system. (This work should be performed by GT-R certified
NISSAN dealer.)
Is A/C control system normal?

YES

>> GO TO 4.

NO

>> GO TO 8.

4.

PERFORMANCE TEST

Perform the performance test. Check the operation of each part. Refer to 

HA-26, "Inspection"

.

>> GO TO 5.

5.

TROUBLE DIAGNOSIS FOR UNUSUAL PRESSURE

Diagnose using a manifold gauge whenever system's high and/or low side pressure(s) is/are unusual. Specify
the malfunctioning part. Refer to 

HA-7, "Symptom Table"

.

Low refrigerant charge>>GO TO 6.
Except above>>GO TO 8.

6.

CHECK REFRIGERANT FOR LEAKAGES

Check refrigerant for leakages. Specify the malfunctioning part. Refer to 

HA-29, "Inspection"

.

>> GO TO 8.

7.

TROUBLE DIAGNOSIS FOR NOISE

Perform trouble diagnosis for noise. Specify the malfunctioning part.

>> GO TO 8.

8.

MALFUNCTION PART REPAIR

Repair or replace the malfunctioning part.

>> GO TO 9.

9.

REPAIR CHECK (OPERATION CHECK)

Check the operation of each part.

Does it operate normally?

YES

>> INSPECTION END

NO

>> GO TO 2.

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< SYSTEM DESCRIPTION >

REFRIGERATION SYSTEM

SYSTEM DESCRIPTION

REFRIGERATION SYSTEM

System Diagram

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System Description

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REFRIGERANT CYCLE

Refrigerant Flow

The refrigerant flows from the compressor, through the condenser with liquid tank, through the evaporator, and
back to the compressor. The refrigerant evaporation in the evaporator is controlled by an externally equalized
expansion valve, located inside the evaporator case.

Freeze Protection

To prevent evaporator from freezing up, the evaporator air temperature is monitored, and the voltage signal to
the A/C auto amp. makes the A/C relay go OFF and stop the compressor.

REFRIGERANT SYSTEM PROTECTION

Refrigerant Pressure Sensor

The refrigerant system is protected against excessively high- or low-pressures by the refrigerant pressure sen-
sor, located on the liquid tank. The refrigerant pressure sensor detects the pressure inside the refrigerant line
and sends the voltage signal to the ECM if the system pressure rises above, or falls below the specifications. 
The high-pressure side detected by refrigerant pressure sensor is approximately 3,120 kPa (31.8 kg/cm

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, 452

psi) or more when the engine speed is 1,500 rpm or more. It is approximately 2,740 kPa (27.9 kg/cm

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, 397 psi)

when the engine speed is less than 1,500 rpm. When it is approximately 120 kPa (1.2 kg/cm

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, 17 psi) or less,

ECM turns the A/C relay to OFF and stops the compressor.

Pressure Relief Valve

The refrigerant system is also protected by a pressure relief valve, located in the rear head of the compressor.
The release port on the pressure relief valve automatically opens and releases refrigerant into the atmosphere
when the pressure of refrigerant in the system increases to an unusual level [more than 3,628 kPa (37 kg/cm

2

,

526 psi)].

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