Nissan Pathfinder (2008 year). Manual - part 624

HEATER & COOLING UNIT ASSEMBLY

VTL-17

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HEATER & COOLING UNIT ASSEMBLY

Component

INFOID:0000000001672965

Front Heater and Cooling Unit Assembly

WJIA1402E

1.

Front high-pressure A/C pipe

2.

Front low-pressure A/C pipe

3.

Front expansion valve

4.

Front heater core and evaporator 
pipes grommet

5.

Front A/C drain hose grommet 6.

Front A/C drain hose

7.

Front heater core pipe mounts

8.

Front heater core pipes

9.

Front heater and cooling unit assembly

VTL-18

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HEATER & COOLING UNIT ASSEMBLY

Rear Heater and Cooling Unit Assembly

Removal and Installation

INFOID:0000000001672966

FRONT HEATER AND COOLING UNIT ASSEMBLY

Removal

1.

Discharge the refrigerant from the A/C system. Refer to 

HA-37, "HFC-134a (R-134a) Service Procedure"

.

2.

Drain the coolant from the engine cooling system. Refer to 

CO-12, "Changing Engine Coolant"

 (VQ40DE),

CO-39, "Changing Engine Coolant"

 (VK56DE).

WJIA1403E

1.

Rear high- and low-pressure A/C pipes

2.

Rear heater core hoses

3.

Rear high- and low-pressure A/C pipes 
cover

4.

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

5.

Rear expansion valve

6.

Rear heater and cooling unit assembly

HEATER & COOLING UNIT ASSEMBLY

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3.

Remove the front heater core pipes RH nut.

4.

Disconnect the front heater core hoses from the front heater
core.

5.

Disconnect the high- and low-pressure A/C pipes from the front
expansion valve.

6.

Move the two front seats to the rearmost position on the seat
track.

7.

Remove the instrument panel and console panel. Refer to 

IP-10,

"Removal and Installation"

.

8.

Remove the two front floor ducts.

9.

Remove the steering column. Refer to 

ST-17, "Removal and

Installation"

.

10. Disconnect the instrument panel wire harness at the RH and LH in-line connector brackets, and the fuse

block (SMJ) electrical connectors. Refer to 

PG-31, "Harness Layout"

.

11. Remove the covers then remove the three steering member bolts from each side to disconnect the steer-

ing member from the vehicle body.

12. Remove the front heater and cooling unit assembly with it attached to the steering member, from the vehi-

cle.

CAUTION:

• Use care not to damage the seats and interior trim panels when removing the front heater and

cooling unit assembly with it attached to the steering member.

• Use suitable plugs on the heater core pipes to prevent coolant leakage.

13. Remove the front heater and cooling unit assembly from the steering member.

Installation

Installation is in the reverse order of removal.

CAUTION:

• Replace the O-ring of the low-pressure A/C pipe and high-pressure A/C pipe with a new one, and

apply compressor oil to the O-ring for installation. Refer to 

HA-34, "Component"

.

• After charging the refrigerant, check for leaks. Refer to 

HA-29, "Checking of Refrigerant Leaks"

.

NOTE:
• Fill the engine cooling system with the specified coolant mixture. Refer to 

CO-12, "Changing Engine Cool-

ant"

 (VQ40DE), 

CO-39, "Changing Engine Coolant"

 (VK56DE).

• Recharge the A/C system. Refer to 

HA-37, "HFC-134a (R-134a) Service Procedure"

.

REAR HEATER AND COOLING UNIT ASSEMBLY

Removal

1.

Discharge the refrigerant from the A/C system. Refer to 

HA-37, "HFC-134a (R-134a) Service Procedure"

.

2.

Drain the coolant from the engine cooling system. Refer to 

CO-12, "Changing Engine Coolant"

 (VQ40DE),

CO-39, "Changing Engine Coolant"

 (VK56DE).

3.

Remove the luggage side lower finisher RH. Refer to 

INT-19, "Removal and Installation"

.

4.

Disconnect the rear heater core hoses from the rear heater core.

5.

Disconnect the rear A/C high- and low-pressure A/C pipes from the rear expansion valve.

6.

Disconnect the following electrical connectors:
• Rear blower motor
• Rear blower motor resistor
• Rear air mix door motor

7.

Disconnect the ducts from the rear heater and cooling unit assembly.

8.

Remove the three bolts to remove the rear heater and cooling unit assembly.

Installation

Installation is in the reverse order of removal.

CAUTION:

• Replace the O-ring of the low-pressure A/C pipe and high-pressure A/C pipe with a new one, and

apply compressor oil to the O-ring for installation. Refer to 

HA-34, "Component"

.

• After charging the refrigerant, check for leaks. Refer to 

HA-29, "Checking of Refrigerant Leaks"

.

NOTE:

LJIA0165E

VTL-20

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HEATER & COOLING UNIT ASSEMBLY

• Fill the engine cooling system with the specified coolant mixture. Refer to 

CO-12, "Changing Engine Cool-

ant"

 (VQ40DE), 

CO-39, "Changing Engine Coolant"

 (VK56DE).

• Recharge the A/C system. Refer to 

HA-37, "HFC-134a (R-134a) Service Procedure"

.

EVAPORATOR

VTL-21

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EVAPORATOR

Removal and Installation for Front Evaporator

INFOID:0000000001672977

Front Heater and Cooling Unit Assembly

REMOVAL

LJIA0178E

1.

Center ventilator connector duct

2.

Front heater core cover

3.

Intake air case

4.

Front heater core and evaporator 
pipes bracket

5.

Front heater core and evaporator 
pipes grommet

6.

Front heater core

7.

Upper heater and cooling unit case

8.

Front expansion valve

9.

Front evaporator

10. Lower heater and cooling unit case

11.

Variable blower control

12. Blower motor

VTL-22

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EVAPORATOR

1.

Remove the front heater core. Refer to 

VTL-26, "Removal and Installation"

.

2.

Separate the heater and cooling unit case.

3.

Remove the front evaporator.

INSTALLATION

Installation is in the reverse order of removal.

CAUTION:

Replace the O-rings on the front A/C low-pressure flexible A/C hose and the front high-pressure A/C
pipe with new ones. Apply compressor oil to the O-rings for installation.

Removal and Installation for Rear Evaporator

INFOID:0000000001672978

Rear Heater and Cooling Unit Assembly

REMOVAL

LJIA0135E

1.

Front cover

2.

Rear evaporator and heater core case

3.

Rear evaporator

4.

Side cover

5.

Rear heater core

6.

Rear blower motor

7.

Blower motor case

8.

Rear blower motor resistor

EVAPORATOR

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1.

Remove the rear heater and cooling unit assembly from the vehicle. Refer to 

VTL-18, "Removal and

Installation"

.

2.

Remove the rear blower motor.

3.

Remove the rear blower speed resistor.

4.

Remove the rear air mix door motor.

5.

Remove the rear duct and blend door assembly. Refer to 

VTL-

33, "Removal and Installation"

.

6.

Disassemble the rear heater and cooling unit assembly to
remove the rear evaporator.

INSTALLATION

Installation is in the reverse order of removal.

CAUTION:

• Replace the O-rings on the rear high- and low-pressure A/C pipes with new ones. Apply compressor

oil to the O-rings for installation.

• After charging refrigerant, check for leaks.

WJIA1134E

VTL-24

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EXPANSION VALVE

EXPANSION VALVE

Removal and Installation for Rear Expansion Valve

INFOID:0000000001672979

REMOVAL

1.

Discharge the refrigerant. Refer to 

HA-37, "HFC-134a (R-134a) Service Procedure"

.

2.

Remove the luggage side lower finisher RH access door.

3.

Disconnect the rear high- and low-pressure A/C pipes from the rear expansion valve.

CAUTION:

Cap or wrap the A/C refrigerant pipe ends with a suitable material such as vinyl tape to avoid the
entry of air and contaminants.

4.

Remove the expansion valve.

INSTALLATION

Installation is in the reverse order of removal.

CAUTION:

• Replace the O-rings on the rear expansion valve and the rear high- and low-pressure A/C pipes with

new ones, then apply compressor oil to them for installation.

• After charging refrigerant, check for leaks.

Expansion valve bolts

: Refer to 

HA-34, "Component"

.

A/C refrigerant pipe to expansion valve bolt

: Refer to 

HA-34, "Component"

.