Nissan Pathfinder (2011 year). Manual - part 443

INSPECTION AND ADJUSTMENT

HAC-7

< BASIC INSPECTION >

[AUTOMATIC AIR CONDITIONER]

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4. Press the REAR CTRL switch (indicator on) from the rear air control (front).
5. Rotate the rear air control (rear) temperature control dial counterclockwise to maximum cold.
6. Check for cold air at appropriate discharge air outlets.
If NG, listen for sound of air mix door motor operation. If OK, go to trouble diagnosis procedure for 

HAC-57,

"Rear Air Control Component Function Check"

. If air mix door motor appears to be malfunctioning, go to 

HAC-

58, "Rear Air Control (Front) Diagnosis Procedure"

.

If OK, continue with next check.

CHECKING REAR TEMPERATURE INCREASE

1. Press the REAR CTRL switch (indicator off).
2. Rotate the rear air control (front) temperature control dial clockwise to maximum heat.
3. Check for hot air at appropriate discharge air outlets.
4. Press the REAR CTRL switch (indicator on) from the rear air control (front).
5. Rotate the rear air control (rear) temperature control dial clockwise to maximum heat.
6. Check for hot air at appropriate discharge air outlets.
If NG, listen for sound of air mix door motor operation. If OK, go to trouble diagnosis procedure for 

HAC-120,

"Component Function Check"

. If air mix door motor appears to be malfunctioning, go to 

HAC-58, "Rear Air

Control (Front) Diagnosis Procedure"

.

If NG, go to trouble diagnosis procedure for 

HAC-120, "Component Function Check"

.

If all operational checks are OK (inspection results are normal), go to 

HAC-4, "How to Perform Trouble Diag-

nosis For Quick And Accurate Repair"

 and perform tests as outlined. If symptom appears, refer to 

HAC-111,

"Symptom Matrix Chart"

 and perform applicable trouble diagnosis procedures.

2011 Pathfinder

HAC-8

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

FUNCTION INFORMATION

SYSTEM DESCRIPTION

FUNCTION INFORMATION

Component Part Location

INFOID:0000000006243617

ENGINE COMPARTMENT

VQ40DE

WJIA2270E

1.

Heater pump relay E144

2.

Refrigerant pressure sensor E48 
(View with battery removed)

⇐

: Front  

3.

Ambient sensor E1 (View with grille 
removed)

4.

A/C compressor F3

5.

Heater pump E141

2011 Pathfinder

FUNCTION INFORMATION

HAC-9

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

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VK56DE

PASSENGER COMPARTMENT

AWIIA0220ZZ

1.

Refrigerant pressure sensor E50 
(View with battery removed)

⇐

: Front  

2.

Ambient sensorE1 (View with grille 
removed)

3.

A/C compressor F3

4.

Water valve F68

2011 Pathfinder

HAC-10

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

FUNCTION INFORMATION

1.

A/C Auto amp. M49, M50

2.

In-vehicle sensor M32

3.

Intake sensor M146

4.

Intake door motor M58

5.

Variable blower control (front) 
M122

6.

Air mix door motor (driver) M147

7.

Mode door motor (front) M142

8.

Air mix door motor (passenger) 
M143

9.

Optical sensor M145

⇐

:Front

AWIIA0221ZZ

2011 Pathfinder

FUNCTION INFORMATION

HAC-11

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

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REAR PASSENGER COMPARTMENT

Symptom Table

INFOID:0000000006243618

1.

Rear air control (front) R2

2.

Rear air control (rear) M208

3.

Rear blower motor B501

4.

Variable blower control (rear) B133

5. 

Air mix door motor (rear) B155

AWIIA0222ZZ

Symptom

Reference Page

A/C system does not come on.

Go to Trouble Diagnosis Procedure for A/C System.

HAC-90

A/C system display is malfunctioning (with 
NAVI).

Go to Navigation System.

AV-335

A/C system display is malfunctioning (without 
NAVI).

Go to Mid-level Audio System.

AV-164

A/C system cannot be controlled.

Go to Self-diagnosis Function.

HAC-24

Air outlet does not change.

Go to Trouble Diagnosis Procedure for Mode Door Motor.

HAC-27

Mode door motor is malfunctioning.

Discharge air temperature does not change.

Go to Trouble Diagnosis Procedure for Air Mix Door Motor.

HAC-31

Air mix door motor is malfunctioning.

2011 Pathfinder

HAC-12

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

FUNCTION INFORMATION

Intake door does not change.

Go to Trouble Diagnosis Procedure for Intake Door Motor.

HAC-39

Intake door motor is malfunctioning.

Front blower motor operation is malfunction-
ing.

Go to Trouble Diagnosis Procedure for Front Blower Motor.

HAC-42

Rear blower motor operation is malfunction-
ing.

Go to Trouble Diagnosis Procedure for Rear Blower Motor.

HAC-48

Rear discharge air temperature and/or air 
outlet does not change.

Go to Trouble Diagnosis Procedure for Rear Air Control circuit.

HAC-57

Magnet clutch does not engage.

Go to Trouble Diagnosis Procedure for Magnet Clutch.

HAC-69

Insufficient cooling

Go to Trouble Diagnosis Procedure for Insufficient Cooling.

HAC-112

Insufficient heating

Go to Trouble Diagnosis Procedure for Insufficient Heating.

HAC-120

Noise

Go to Trouble Diagnosis Procedure for Noise.

HAC-122

Self-diagnosis cannot be performed.

Go to Trouble Diagnosis Procedure for Self-diagnosis.

HAC-90

Memory function does not operate.

Go to Trouble Diagnosis Procedure for Memory Function.

HAC-124

Symptom

Reference Page

2011 Pathfinder

REFRIGERATION SYSTEM

HAC-13

< 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 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.

FREEZE PROTECTION

The compressor cycles on and off to maintain the evaporator temperature within a specified range. When the

evaporator coil temperature falls below a specified point, the intake sensor interrupts the compressor opera-

tion. When the evaporator coil temperature rises above the specification, the intake sensor allows compressor

operation.

Refrigerant System Protection

INFOID:0000000006243620

REFRIGERANT PRESSURE SENSOR

WJIA1342E

2011 Pathfinder

HAC-14

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

REFRIGERATION SYSTEM

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/
cm

2

, 433.6 psi)], the release port on the pressure relief valve automatically opens and releases refrigerant into

the atmosphere.

2011 Pathfinder