Nissan Pathfinder (2011 year). Manual - part 458

PRECAUTIONS

HAC-127

< PRECAUTION >

[AUTOMATIC AIR CONDITIONER]

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SERVICE HOSES

Be certain that the service hoses display the markings described

(colored hose with black stripe). All hoses must include positive shut-

off devices (either manual or automatic) near the end of the hoses

opposite the manifold gauge.

SERVICE COUPLERS

Never attempt to connect HFC-134a (R-134a) service couplers to a

CFC-12 (R-12) A/C system. The HFC-134a (R-134a) couplers will

not properly connect to the CFC-12 (R-12) system. However, if an

improper connection is attempted, discharging and contamination

may occur.

RHA272D

Shut-off valve rotation

A/C service valve

Clockwise

Open

Counterclockwise

Close

RHA273D

2011 Pathfinder

HAC-128

< BASIC INSPECTION >

[MANUAL AIR CONDITIONER]

DIAGNOSIS AND REPAIR WORKFLOW

BASIC INSPECTION

DIAGNOSIS AND REPAIR WORKFLOW

How to Perform Trouble Diagnosis For Quick And Accurate Repair

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WORK FLOW

1.

LISTEN TO CUSTOMER COMPLAINT

Listen to customer complaint. Get detailed information about the conditions and environment when the symp-

tom occurs.

>> GO TO 2.

2.

CHECK FOR SERVICE BULLETINS

Check for any service bulletins.

>> GO TO 3.

3.

VERIFY THE SYMPTOM WITH OPERATIONAL CHECK

Verify the symptom with operational check. Refer to 

HAC-129, "Operational Check"

. 

Is the inspection result normal?

YES

>> Go to trouble diagnosis. Refer to 

HAC-178, "Symptom Matrix Chart"

.

NO

>> System OK.

2011 Pathfinder

INSPECTION AND ADJUSTMENT

HAC-129

< BASIC INSPECTION >

[MANUAL AIR CONDITIONER]

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INSPECTION AND ADJUSTMENT

Operational Check

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The purpose of the operational check is to confirm that the system operates properly.

CHECKING BLOWER

1. Turn blower control dial clockwise. Blower should operate on low speed. 
2. Turn the blower control dial again, and continue checking each blower speed until all speeds are checked.
3. Leave blower on speed 4. 
If NG, go to trouble diagnosis procedure for 

HAC-154, "Front Blower Motor Diagnosis Procedure"

.

If OK, continue with next check.

CHECKING DISCHARGE AIR

1. Turn the mode switch to each position.

2. Confirm that discharge air comes out according to the air distribution table. Refer to 

HAC-138, "Discharge

Air Flow"

.

Mode door position is checked in the next step.

If NG, go to trouble diagnosis procedure for 

HAC-143, "Mode Door Motor (Front) Diagnosis Procedure"

.

If OK, continue with next check.

NOTE:

Confirm that the A/C compressor clutch is engaged (sound or visual inspection) and intake door position is at
fresh when the DEF (

) or D/F (

) is selected.

CHECKING RECIRCULATION

1. Press recirculation (

) switch one time. Recirculation indicator should illuminate.

2. Press recirculation (

) switch one more time. Recirculation indicator should go off.

3. Listen for intake door position change (blower sound should change slightly).
If NG, go to trouble diagnosis procedure for 

HAC-151, "Intake Door Motor Diagnosis Procedure"

.

If OK, continue with next check.

NOTE:

Confirm that the compressor clutch is engaged (sound or visual inspection) and intake door position is at fresh

when the DEF or D/F is selected.

CHECKING TEMPERATURE DECREASE

1. Rotate temperature control dial counterclockwise.
2. 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-179,

"Component Function Check"

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

HAC-147, "Air Mix

Door Motor Component Function Check"

.

If OK, continue with next check.

CHECKING TEMPERATURE INCREASE

1. Rotate temperature control dial clockwise.
2. 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-187,

"Component Function Check"

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

HAC-147, "Air

Mix Door Motor Component Function Check"

.

If OK, continue with next check.

CHECK A/C SWITCH

1. Press A/C switch with the blower switch ON.
2. A/C switch indicator will turn ON.

• Confirm that the compressor clutch engages (sound or visual inspection).

Conditions

: Engine running and at normal operating temperature

2011 Pathfinder

HAC-130

< BASIC INSPECTION >

[MANUAL AIR CONDITIONER]

INSPECTION AND ADJUSTMENT

If NG, go to trouble diagnosis procedure for 

HAC-160, "Magnet Clutch Diagnosis Procedure"

.

If OK, continue with next check.

2011 Pathfinder

FUNCTION INFORMATION

HAC-131

< SYSTEM DESCRIPTION >

[MANUAL AIR CONDITIONER]

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SYSTEM DESCRIPTION

FUNCTION INFORMATION

Component Part Location

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ENGINE COMPARTMENT

WJIA1489E

2011 Pathfinder

HAC-132

< SYSTEM DESCRIPTION >

[MANUAL AIR CONDITIONER]

FUNCTION INFORMATION

PASSENGER COMPARTMENT

1.

Front air control M52

2.

Intake sensor M146

3.

Intake door motor M58

4.

Front blower motor resistor M121

5.

Mode door motor M144

6.

Air mix door motor (front) M149

AWIIA1194GB

2011 Pathfinder

FUNCTION INFORMATION

HAC-133

< SYSTEM DESCRIPTION >

[MANUAL AIR CONDITIONER]

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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.

HAC-167

Air outlet does not change.

Go to Trouble Diagnosis Procedure for Mode Door Motor.

HAC-142

Mode door motor is malfunctioning.

Discharge air temperature does not change.

Go to Trouble Diagnosis Procedure for Air Mix Door Motor.

HAC-147

Air mix door motor is malfunctioning.

Intake door does not change.

Go to Trouble Diagnosis Procedure for Intake Door Motor.

HAC-150

Intake door motor is malfunctioning.

Front blower motor operation is malfunctioning. Go to Trouble Diagnosis Procedure for Front Blower Motor.

HAC-153

Magnet clutch does not engage.

Go to Trouble Diagnosis Procedure for Magnet Clutch.

HAC-160

Insufficient cooling

Go to Trouble Diagnosis Procedure for Insufficient Cooling.

HAC-179

Insufficient heating

Go to Trouble Diagnosis Procedure for Insufficient Heating.

HAC-187

Noise

Go to Trouble Diagnosis Procedure for Noise.

HAC-189

2011 Pathfinder

HAC-134

< SYSTEM DESCRIPTION >

[MANUAL AIR CONDITIONER]

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 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

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REFRIGERANT PRESSURE SENSOR

WJIA1342E

2011 Pathfinder