Nissan Titan. Manual — part 376
FUNCTION INFORMATION
HAC-9
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONER]
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HAC
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PASSENGER COMPARTMENT
1.
Front air control M49, M50
2.
In-vehicle sensor M32
3.
Intake sensor M146
4.
Intake door motor M58
5.
Variable blower control M122
6.
Air mix door motor (Passenger) M143
7.
Mode door motor M142
8.
Defroster door motor M144
9.
Air mix door motor (driver) M147
10. Optical sensor M302
⇐
:Front
ALIIA0694ZZ
HAC-10
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONER]
FUNCTION INFORMATION
Symptom Table
INFOID:0000000009882436
Symptom
Reference Page
A/C system does not come on.
Go to Trouble Diagnosis Procedure for A/C 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.
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.
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.
REFRIGERATION SYSTEM
HAC-11
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONER]
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HAC
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REFRIGERATION SYSTEM
Refrigerant Cycle
INFOID:0000000009882437
REFRIGERANT FLOW
The refrigerant flows in the standard pattern, that is, through the compressor, the condenser with liquid tank,
through the evaporator, and back to the compressor. The refrigerant evaporation through the evaporator coils
are controlled by externally equalized expansion valve, located inside the evaporator case.
Refrigerant System Protection
INFOID:0000000009882438
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).
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/
HAC-12
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONER]
REFRIGERATION SYSTEM
cm
2
, 433.6 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant into
the atmosphere.
WJIA1347E
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