Nissan Frontier. Manual — part 864
HAC-10
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONER]
FUNCTION INFORMATION
Symptom Table
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1.
Front air control M52, M56
2.
In-vehicle sensor M34
3.
Intake sensor M146
4.
Intake door motor M58
5.
Variable blower control (front)
M121
6.
Air mix door motor (Passenger) M131
7.
Mode door motor M142
8.
Air mix door motor (driver) M148
9.
Optical sensor M14
⇐
:Front
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.
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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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/
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
AUTOMATIC AIR CONDITIONER SYSTEM
HAC-13
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONER]
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AUTOMATIC 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 with rear window defogger
ALIIA0754GB
AWIIA0937ZZ
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