Nissan Titan A60. Manual — part 626
FUNCTION INFORMATION
HAC-187
< SYSTEM DESCRIPTION >
[MANUAL A/C (TYPE 2)]
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Symptom Table
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Symptom
Reference Page
A/C system does not come on.
Go to Trouble Diagnosis Procedure for A/C System.
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 malfunctioning.
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.
HAC-188
< SYSTEM DESCRIPTION >
[MANUAL A/C (TYPE 2)]
REFRIGERATION SYSTEM
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 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
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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/
REFRIGERATION SYSTEM
HAC-189
< SYSTEM DESCRIPTION >
[MANUAL A/C (TYPE 2)]
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cm
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, 433.6 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant into
the atmosphere.
WJIA1347E
HAC-190
< SYSTEM DESCRIPTION >
[MANUAL A/C (TYPE 2)]
MANUAL AIR CONDITIONER SYSTEM
MANUAL AIR CONDITIONER SYSTEM
Control System Diagram
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CONTROL SYSTEM
The control system consists of input sensors, switches, the front air control (microcomputer) and outputs.
The relationship of these components is shown in the figure below:
Control System Description
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CONTROL OPERATION
Front air control
WJIA1448E
WJIA1405E
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