Nissan Pathfinder (2009 year). Manual — part 466

PRECAUTIONS

HAC-123

< PRECAUTION >

[AUTOMATIC AIR CONDITIONER]

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not have dedicated recovery equipment, you may contact a local refrigerant product retailer for available ser-
vice. This refrigerant must be disposed of in accordance with all federal and local regulations. In addition,
replacement of all refrigerant system components on the vehicle is recommended.

• If the vehicle is within the warranty period, the air conditioner warranty is void. Please contact NISSAN Cus-

tomer Affairs for further assistance.

Precaution for Service Equipment

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MANIFOLD GAUGE SET

Be certain that the gauge face indicates R-134a or 134a. Make sure
the gauge set has 1/2

″

-16 ACME threaded connections for service

hoses. Confirm the set has been used only with refrigerant HFC-
134a (R-134a) along with specified oil.

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.

SHA533D

RHA272D

Shut-off valve rotation

A/C service valve

Clockwise

Open

Counterclockwise

Close

RHA273D

2009 Pathfinder

HAC-124

< 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-125, "Operational Check"

.

Can a symptom be duplicated?

YES

>> Go to trouble diagnosis. Refer to

HAC-174, "Symptom Matrix Chart"

.

NO

>> System OK.

2009 Pathfinder

INSPECTION AND ADJUSTMENT

HAC-125

< 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-150, "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-134, "Discharge

Air Flow"

.

Mode door position is checked in the next step.
If NG, go to trouble diagnosis procedure for

HAC-139, "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-147, "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-175,

"Component Function Check"

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

HAC-143, "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-183,

"Component Function Check"

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

HAC-143, "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

2009 Pathfinder

HAC-126

< BASIC INSPECTION >

[MANUAL AIR CONDITIONER]

INSPECTION AND ADJUSTMENT

If NG, go to trouble diagnosis procedure for

HAC-156, "Magnet Clutch Diagnosis Procedure"

.

If OK, continue with next check.

2009 Pathfinder

FUNCTION INFORMATION

HAC-127

< FUNCTION DIAGNOSIS >

[MANUAL AIR CONDITIONER]

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FUNCTION DIAGNOSIS

FUNCTION INFORMATION

Component Part Location

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ENGINE COMPARTMENT

WJIA1489E

2009 Pathfinder

HAC-128

< FUNCTION DIAGNOSIS >

[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 M142

6.

Air mix door motor (front) M149

AWIIA1194GB

2009 Pathfinder

FUNCTION INFORMATION

HAC-129

< FUNCTION DIAGNOSIS >

[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-163

Air outlet does not change.

Go to Trouble Diagnosis Procedure for Mode Door Motor.

HAC-138

Mode door motor is malfunctioning.

Discharge air temperature does not change.

Go to Trouble Diagnosis Procedure for Air Mix Door Motor.

HAC-143

Air mix door motor is malfunctioning.

Intake door does not change.

Go to Trouble Diagnosis Procedure for Intake Door Motor.

HAC-146

Intake door motor is malfunctioning.

Front blower motor operation is malfunctioning.

Go to Trouble Diagnosis Procedure for Front Blower Motor.

HAC-149

Magnet clutch does not engage.

Go to Trouble Diagnosis Procedure for Magnet Clutch.

HAC-156

Insufficient cooling

Go to Trouble Diagnosis Procedure for Insufficient Cooling.

HAC-175

Insufficient heating

Go to Trouble Diagnosis Procedure for Insufficient Heating.

HAC-183

Noise

Go to Trouble Diagnosis Procedure for Noise.

HAC-185

2009 Pathfinder

HAC-130

< FUNCTION DIAGNOSIS >

[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

2009 Pathfinder