Infiniti QX56 (JA60). Manual - part 588

FUNCTION INFORMATION

HAC-9

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

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J

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HAC

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REAR PASSENGER COMPARTMENT

Symptom Table

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1.

Rear blower control (rear)

2.

Rear mode switch (rear)

3.

Rear temperature control (rear)

4.

Rear blower motor B134

5.

Variable blower control (rear) B133

6.

Air mix door motor (rear) B155

7.

Mode door motor (rear) B156

⇐

: Front

AWIIA0080ZZ

Symptom

Reference Page

A/C system does not come on.

Go to Trouble Diagnosis Procedure for A/C System.

HAC-86

A/C system display is malfunctioning.

Go to Navigation System.

AV-69

A/C system cannot be controlled.

Go to Self-diagnosis Function.

HAC-23

Air outlet does not change.

Go to Trouble Diagnosis Procedure for Mode Door Motor.

HAC-26

Mode door motor is malfunctioning.

Discharge air temperature does not change.

Go to Trouble Diagnosis Procedure for Air Mix Door Motor.

HAC-31

Air mix door motor is malfunctioning.

Intake door does not change.

Go to Trouble Diagnosis Procedure for Intake Door Motor.

HAC-40

Intake door motor is malfunctioning.

HAC-10

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

FUNCTION INFORMATION

Defroster door motor is malfunctioning.

Go to Trouble Diagnosis Procedure for Defroster Door Motor.

HAC-43

Front blower motor operation is malfunction-
ing.

Go to Trouble Diagnosis Procedure for Front Blower Motor.

HAC-48

Rear blower motor operation is malfunction-
ing.

Go to Trouble Diagnosis Procedure for Rear Blower Motor.

HAC-53

Rear air discharge outlet does not change.

Go to Trouble Diagnosis Procedure for Mode Door Motor (rear).

HAC-58

Rear air temperature does not change.

Go to Trouble Diagnosis Procedure for Air Mix Door Motor (rear).

HAC-58

Magnet clutch does not engage.

Go to Trouble Diagnosis Procedure for Magnet Clutch.

HAC-68

Insufficient cooling

Go to Trouble Diagnosis Procedure for Insufficient Cooling.

HAC-108

Insufficient heating

Go to Trouble Diagnosis Procedure for Insufficient Heating.

HAC-116

Noise

Go to Trouble Diagnosis Procedure for Noise.

HAC-118

Self-diagnosis cannot be performed.

Go to Trouble Diagnosis Procedure for Self-diagnosis.

HAC-86

Memory function does not operate.

Go to Trouble Diagnosis Procedure for Memory Function.

HAC-120

Symptom

Reference Page

REFRIGERATION SYSTEM

HAC-11

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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HAC

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REFRIGERATION SYSTEM

Refrigerant Cycle

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REFRIGERANT FLOW

The refrigerant flows in the standard pattern, that is, through the compressor, the condenser with liquid tank,

through the front and rear evaporators, and back to the compressor. The refrigerant evaporation through the

evaporator coils are controlled by front and rear externally equalized expansion valves, located inside the front

and rear evaporator cases.

Refrigerant System Protection

INFOID:0000000005197358

REFRIGERANT PRESSURE SENSOR

The refrigerant system is protected against excessively high or low pressures by the refrigerant pressure sen-

sor, located on the condenser. If the system pressure rises above or falls below the specifications, the refriger-

ant pressure sensor detects the pressure inside the refrigerant line and sends a voltage signal to the ECM.

The ECM de-energizes the A/C relay to disengage the magnetic compressor clutch when pressure on the high
pressure side detected by refrigerant pressure sensor is over about 2,746 kPa (28 kg/cm

2

, 398 psi), or below

about 120 kPa (1.22 kg/cm

2

, 17.4 psi).

WJIA1342E

HAC-12

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

REFRIGERATION SYSTEM

PRESSURE RELIEF VALVE

The refrigerant system is also protected by a pressure relief valve, located in the rear head of the compressor.

When the pressure of refrigerant in the system increases to an abnormal level [more than 2,990 kPa (30.5 kg/
cm

2

, 433.6 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant into

the atmosphere.