Infiniti QX56 (JA60). Manual — part 588
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FUNCTION INFORMATION
HAC-9
< FUNCTION DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
REAR PASSENGER COMPARTMENT
Symptom Table
INFOID:0000000005147672
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.
A/C system display is malfunctioning.
Go to Navigation System.
A/C system cannot be controlled.
Go to Self-diagnosis Function.
Air outlet does not change.
Go to Trouble Diagnosis Procedure for Mode Door Motor.
Mode door motor is malfunctioning.
Discharge air temperature does not change.
Go to Trouble Diagnosis Procedure for Air Mix Door Motor.
Air mix door motor is malfunctioning.
Intake door does not change.
Go to Trouble Diagnosis Procedure for Intake Door Motor.
Intake door motor is malfunctioning.
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HAC-10
< FUNCTION DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
FUNCTION INFORMATION
Defroster door motor is malfunctioning.
Go to Trouble Diagnosis Procedure for Defroster Door Motor.
Front blower motor operation is malfunction-
ing.
Go to Trouble Diagnosis Procedure for Front Blower Motor.
Rear blower motor operation is malfunction-
ing.
Go to Trouble Diagnosis Procedure for Rear Blower Motor.
Rear air discharge outlet does not change.
Go to Trouble Diagnosis Procedure for Mode Door Motor (rear).
Rear air temperature does not change.
Go to Trouble Diagnosis Procedure for Air Mix Door Motor (rear).
Magnet clutch does not engage.
Go to Trouble Diagnosis Procedure for Magnet Clutch.
Insufficient cooling
Go to Trouble Diagnosis Procedure for Insufficient Cooling.
Insufficient heating
Go to Trouble Diagnosis Procedure for Insufficient Heating.
Noise
Go to Trouble Diagnosis Procedure for Noise.
Self-diagnosis cannot be performed.
Go to Trouble Diagnosis Procedure for Self-diagnosis.
Memory function does not operate.
Go to Trouble Diagnosis Procedure for Memory Function.
Symptom
Reference Page
![](/vehicles/zatt/vend/genn/joif.png)
REFRIGERATION SYSTEM
HAC-11
< FUNCTION DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
REFRIGERATION SYSTEM
Refrigerant Cycle
INFOID:0000000005197357
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.
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