Nissan Pathfinder (2011 year). Manual - part 439

ELECTRICAL LEAK DETECTOR

HA-33

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Keep the probe inserted for at least 10 seconds. Use caution not to contaminate the probe tip with water

or dirt that may be in the drain hose.

5. If a leak is detected, verify at least once by blowing compressed air into the area of the suspected leak,

then repeat the leak check.

6. Do not stop when one leak is found. Continue to check for additional leaks at all system components and

connections.

7. If no leaks are found, perform steps 8 - 11.
8. Start the engine.
9. Set the heater A/C controls as follows:

NOTE:

For the automatic system, turn OFF the automatic controls and set the heater A/C controls manually.

a. A/C switch to ON
b. Air flow to VENT mode
c. Intake position to RECIRCULATION mode
d. Temperature to MAX cold
e. Blower fan speed to HIGH

10. Run the engine at 1,500 rpm for at least 2 minutes.
11. Turn the engine OFF and perform the leak check again following

steps 4 through 6 above.

Refrigerant leaks should be checked immediately after turning

the engine OFF. Begin with the leak detector at the compressor.

The pressure on the high pressure side will gradually drop after

the refrigerant circulation stops and pressure on the low pres-

sure side will gradually rise, as shown in the graph. Some leaks

are more easily detected when the pressure is high.

12. Before connecting the recovery/recycling equipment to the vehicle, check the recovery/recycling equip-

ment gauges. No refrigerant pressure should be displayed. If pressure is displayed, recover the refriger-

ant from the equipment lines and then check the refrigerant purity.

13. Confirm refrigerant purity in supply tank using recovery/recycling equipment and refrigerant identifier

equipment (J-41810-NI).

14. Confirm the refrigerant purity in the vehicle's A/C system using recovery/recycling equipment and refriger-

ant identifier equipment (J-41810-NI).

15. Discharge the A/C system using recovery/recycling equipment. Repair the leaking fitting or component as

necessary.

16. Evacuate and recharge the A/C system and perform the leak test to confirm that there are no refrigerant

leaks.

17. Conduct the Operational Check to ensure system works properly. Refer to 

HAC-5, "Operational Check

(Front)"

 and 

HAC-6, "Operational Check (Rear)"

.

SHA839E

2011 Pathfinder

HA-34

< REMOVAL AND INSTALLATION >

REFRIGERATION SYSTEM

REMOVAL AND INSTALLATION

REFRIGERATION SYSTEM

Component

INFOID:0000000006243596

Front A/C Compressor and Condenser - VK56DE

AWIIA1537GB

2011 Pathfinder

REFRIGERATION SYSTEM

HA-35

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Front A/C Compressor and Condenser - VQ40DE

1.

High-pressure service valve

2.

Clip

3.

Front high-pressure A/C pipe

4.

Refrigerant pressure sensor

5.

Condenser

6.

Compressor shaft seal

7.

Front high-pressure flexible A/C hose

8.

Front low-pressure flexible A/C hose 9.

Low-pressure service valve

10. Front low-pressure A/C pipe

11. Front expansion valve

12. Front A/C drain hose

Vehicle front

AWIIA1538GB

2011 Pathfinder

HA-36

< REMOVAL AND INSTALLATION >

REFRIGERATION SYSTEM

Rear A/C

CAUTION:

The new and former refrigerant connections use different O-ring configurations. Do not confuse O-

rings since they are not interchangeable. If a wrong O-ring is installed, refrigerant will leak at or

around the connection.

HFC-134a (R-134a) Service Procedure

INFOID:0000000006243597

SETTING OF SERVICE TOOLS AND EQUIPMENT

WARNING:

Avoid breathing A/C refrigerant and oil vapor or mist. Exposure may irritate eyes, nose and throat.

Remove HFC-134a (R-134a) refrigerant from the A/C system using certified service equipment meeting

requirements of SAE J2210 HFC-134a (R-134a) recycling equipment or SAE J2201 HFC-134a (R-134a)

1.

High-pressure service valve

2.

Clip

3.

Front high-pressure A/C pipe

4.

Refrigerant pressure sensor

5.

Condenser

6.

Compressor shaft seal

7.

Front high-pressure flexible A/C hose

8.

Front low-pressure flexible A/C hose 9.

Low-pressure service valve

10. Front low-pressure A/C pipe

11. Front expansion valve

12. Front A/C drain hose

Vehicle front

AWIIA1539GB

1.

Rear high- and low-pressure A/C pipes

2.

Rear heater core hoses

3.

Underfloor rear high- and low-pres-
sure A/C and heater core pipes

4.

Rear expansion valve

5.

Rear drain hose

Vehicle front

2011 Pathfinder

REFRIGERATION SYSTEM

HA-37

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recovery equipment. If an accidental system discharge occurs, ventilate the work area before resum-

ing service. Additional health and safety information may be obtained from the refrigerant and oil man-

ufacturers.

Discharging Refrigerant

Evacuating System and Charging Refrigerant

1.

Shut-off valve

2.

A/C service valve

3.

Recovery/recycling equipment

WJIA1160E

1.

Shut-off valve

2.

A/C service valve

3.

Recovery/recycling equipment

4.

Refrigerant container (HFC-134a)

5.

Refrigerant weight scale (J-39699)

6.

Vacuum pump (J-39649)

7.

Manifold gauge set with hoses and 
couplers (J-39183-C)

WJIA1161E

2011 Pathfinder

HA-38

< REMOVAL AND INSTALLATION >

COMPRESSOR

COMPRESSOR

Removal and Installation for Compressor

INFOID:0000000006243598

A/C Compressor Mounting - VK56DE

CAUTION:

Tighten the compressor bolts to specification in the order shown.

AWIIA1291GB

2011 Pathfinder

COMPRESSOR

HA-39

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A/C Compressor Mounting - VQ40DE

REMOVAL

1. Discharge the A/C refrigerant. Refer to 

HA-36, "HFC-134a (R-134a) Service Procedure"

.

2. Remove the front left wheel and tire assembly. Refer to 

WT-50, "Adjustment"

.

3. Remove the front left fender protector. Refer to 

EXT-25, "Removal and Installation of Front Fender Protec-

tor"

.

4. Reposition the crankcase ventilation hose out of the way.
5. Remove the power steering cooler hose bracket bolt (VK56DE only).
6. Remove the drive belt. Refer to 

EM-153, "Removal and Installation"

 (VK56DE), 

EM-14, "Removal and

Installation"

 (VQ40DE).

7. Disconnect the compressor harness connector.
8. Disconnect both the front high-pressure flexible A/C hose and front low-pressure flexible A/C hose from

the compressor. Refer to 

HA-34, "Component"

.

CAUTION:

Cap or wrap the joint of the pipe with suitable material such as vinyl tape to avoid the entry of air. 

9. Remove the A/C compressor bolts using power tools.

INSTALLATION

Installation is in the reverse order of removal.

CAUTION:

• Tighten the compressor bolts to specification in the order shown above (VK56DE).

• Do not reuse O-rings.

• Apply A/C oil to the O-ring of the front low-pressure flexible A/C hose and front high-pressure flexi-

ble A/C hose for installation.

• After recharging the A/C system with refrigerant, check for leaks. Refer to 

HA-29, "Checking of

Refrigerant Leaks"

.

LJIA0176E

1.

Compressor

2.

Front timing chain case

3.

Rear timing chain case

4.

Cylinder block

2011 Pathfinder

HA-40

< REMOVAL AND INSTALLATION >

COMPRESSOR

Removal and Installation for Compressor Clutch

INFOID:0000000006243599

Magnet Clutch Assembly - VK56DE

Magnet Clutch Assembly - VQ40DE

NOTE:

Illustrations for removal and installation are shown with the compressor out of the vehicle for clarity.

REMOVAL

1. For VQ40DE, remove the engine cooling fan. Refer to 

CO-21, "Removal and Installation (Crankshaft

driven type)"

.

2. For VK56DE, remove the compressor. Refer to 

HA-38, "Removal and Installation for Compressor"

.

AWIIA1286GB

1.

Magnet clutch assembly

2.

Magnet coil

3.

Pulley

4.

Clutch disc

5.

Snap ring

6.

Thermal protector (built in)

7.

Compressor

AWIIA1284GB

1.

Magnet clutch assembly

2.

Magnet coil

3.

Pulley

4.

Clutch disc

5.

Snap ring

6.

Thermal protector (built in)

7.

Compressor

2011 Pathfinder