Nissan Titan. Manual - part 420

FUNCTION INFORMATION

HAC-185

< SYSTEM DESCRIPTION >

[MANUAL A/C (TYPE 2)]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

FUNCTION INFORMATION

Component Part Location

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ENGINE COMPARTMENT

PASSENGER COMPARTMENT

WJIA1924E

1.

Water valve F68

2.

Refrigerant pressure sensor E48 
(view with grille removed)

3.

A/C compressor F3

HAC-186

< SYSTEM DESCRIPTION >

[MANUAL A/C (TYPE 2)]

FUNCTION INFORMATION

1.

Front air control M176, M177

2.

Intake sensor M146

3.

Intake door motor M58

4.

Variable blower control M121

5.

Mode door motor M142

6.

Defroster door motor M144

7.

Air mix door motor M147

ALIIA0696ZZ

FUNCTION INFORMATION

HAC-187

< SYSTEM DESCRIPTION >

[MANUAL A/C (TYPE 2)]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

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.

HAC-227

Air outlet does not change.

Go to Trouble Diagnosis Procedure for Mode Door Motor.

HAC-197

Mode door motor is malfunctioning.

Discharge air temperature does not change.

Go to Trouble Diagnosis Procedure for Air Mix Door Motor.

HAC-201

Air mix door motor is malfunctioning.

Intake door does not change.

Go to Trouble Diagnosis Procedure for Intake Door Motor.

HAC-205

Intake door motor is malfunctioning.

Defroster door motor is malfunctioning.

Go to Trouble Diagnosis Procedure for Defroster Door Motor.

HAC-207

Front blower motor operation is malfunctioning.

Go to Trouble Diagnosis Procedure for Front Blower Motor.

HAC-211

Magnet clutch does not engage.

Go to Trouble Diagnosis Procedure for Magnet Clutch.

HAC-217

Insufficient cooling

Go to Trouble Diagnosis Procedure for Insufficient Cooling.

HAC-244

Insufficient heating

Go to Trouble Diagnosis Procedure for Insufficient Heating.

HAC-252

Noise

Go to Trouble Diagnosis Procedure for Noise.

HAC-254

HAC-188

< SYSTEM DESCRIPTION >

[MANUAL A/C (TYPE 2)]

REFRIGERATION SYSTEM

REFRIGERATION SYSTEM

Refrigerant Cycle

INFOID:0000000009882566

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/