Nissan Pathfinder. Manual - part 683

HEATING AND COOLING UNIT ASSEMBLY

HA-43

< REMOVAL AND INSTALLATION >

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sembly

INFOID:0000000009176756

HEATING AND COOLING UNIT ASSEMBLY : Removal and Installation - Rear Cooling 
Unit Assembly

INFOID:0000000009176757

REMOVAL

CAUTION:

Before servicing, turn the ignition switch off, disconnect both battery cables and wait at least three

minutes.
1. Disconnect the negative and positive battery terminals and wait at least three minutes. Refer to 

PG-90,

"Removal and Installation"

.

2. Discharge the refrigerant. Refer to 

HA-23, "Recycle Refrigerant"

.

3. Remove the back door kicking plate. Refer to 

INT-36, "BACK DOOR KICKING PLATE : Removal and

Installation"

.

4. Remove the luggage side lower finisher (RH). Refer to 

INT-31, "LUGGAGE SIDE LOWER FINISHER :

Removal and Installation"

.

5. Remove the storage box side finisher. Refer to 

INT-33, "STORAGE BOX SIDE FINISHER : Removal and

Installation"

.

6. Remove the jack bracket bolts, then remove the jack bracket.
7. Disconnect the rear underfloor high-pressure and low-pressure pipes from the rear heating and cooling

unit assembly.

CAUTION:

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

8. Remove the rear ventilator duct upper. Refer to 

VTL-13, "REAR VENTILATOR DUCT UPPER : Removal

and Installation"

.

9. Remove the rear ventilator duct lower. Refer to 

VTL-14, "REAR VENTILATOR DUCT LOWER : Removal

and Installation"

.

10. Disconnect the harness connectors from the rear cooling unit assembly.
11. Remove the rear cooling unit assembly bolts.
12. Disconnect the drain hose from the rear cooling unit assembly.
13. Remove the rear cooling unit assembly.

1.

Rear ventilator duct upper seal

2.

Rear blower motor resistor 2

3.

Rear evaporator

4.

Rear expansion valve

5.

Rear expansion valve grommet

6.

Rear expansion valve bolts

7.

O-ring

8.

Rear evaporator seal

9.

Rear drain hose

10. Rear cooling unit lower housing

11. Rear blower motor 2

12. Rear cooling unit upper housing

ALIIA0578ZZ

HA-44

< REMOVAL AND INSTALLATION >

HEATING AND COOLING UNIT ASSEMBLY

INSTALLATION

Installation is in the reverse order of removal.

CAUTION:

• Do not reuse O-rings.

• Apply A/C oil to the O-rings of the rear underfloor high-pressure and low-pressure pipes for installa-

tion.

• After charging refrigerant, check for leaks. Refer to 

HA-21, "Leak Test"

.

HEATER CORE
HEATER CORE : Exploded View

INFOID:0000000009176758

HEATER CORE : Removal and Installation

INFOID:0000000009176759

REMOVAL

NOTE:

When removing components such as hoses, lines/tubes, etc., cap or plug openings to prevent fluid from spill-

ing.
1. Discharge the refrigerant. Refer to 

HA-23, "Recycle Refrigerant"

.

2. Drain the engine coolant. Refer to 

CO-11, "Changing Engine Coolant"

.

3. Remove the front heating and cooling unit assembly. Refer to 

HA-41, "HEATING AND COOLING UNIT

ASSEMBLY : Removal and Installation - Front Heating and Cooling Unit Assembly"

.

4. Remove the front foot duct (LH). Refer to 

HA-41, "HEATING AND COOLING UNIT ASSEMBLY :

Exploded View - Front Heating and Cooling Unit Assembly"

.

5. Remove the front heater core pipe cover. Refer to 

HA-41, "HEATING AND COOLING UNIT ASSEMBLY :

Exploded View - Front Heating and Cooling Unit Assembly"

.

6. Remove the front heater core.

INSTALLATION

Installation is in the reverse order of removal.

EVAPORATOR

1.

Front heating and cooling unit assembly

2.

Front foot duct (LH)

3.

Heater core pipes cover

4.

Heater core

Front

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HEATING AND COOLING UNIT ASSEMBLY

HA-45

< REMOVAL AND INSTALLATION >

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EVAPORATOR : Exploded View

INFOID:0000000009176760

Exploded View - Front Evaporator

Exploded View - Rear Evaporator

EVAPORATOR : Removal and Installation - Front Evaporator

INFOID:0000000009176761

REMOVAL

1. Discharge the refrigerant. Refer to 

HA-23, "Recycle Refrigerant"

.

ALIIA0560ZZ

1.

Front heating and cooling unit assembly

2.

Front evaporator

3.

Heater case side cover

4.

Air mix door motor (passenger side)

5.

Front blower unit case

6.

Intake door motor

7.

Front blower motor

8.

Upper floor connecting duct (RH)

9.

Air mix door motor (rear)

10. In-cabin microfilter cover

11. In-cabin microfilter

12. Drain hose

13. Expansion valve grommet

14. Front expansion valve

15. Front heater core

16. Air mix door motor (driver side)

17. Aspirator hose

18. Upper floor connecting duct (LH)

19. Front heater core pipe cover

20. Mode door motor (front)

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1.

Rear ventilator duct upper seal

2.

Rear blower motor resistor 2

3.

Rear evaporator

4.

Rear expansion valve

5.

Rear expansion valve grommet 6.

Rear expansion valve bolts

7.

O-ring

8.

Rear evaporator seal

9.

Rear drain hose

10. Rear cooling unit lower housing

11. Rear blower motor 2

12. Rear cooling unit upper housing

HA-46

< REMOVAL AND INSTALLATION >

HEATING AND COOLING UNIT ASSEMBLY

2. Remove the front heating and cooling unit assembly. Refer to 

HA-41, "HEATING AND COOLING UNIT

ASSEMBLY : Exploded View - Front Heating and Cooling Unit Assembly"

.

3. Remove the front blower unit case from the front heating and cooling unit assembly.
4. Remove the heater case side cover. 
5. Remove the front evaporator. 

CAUTION:

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

6. Remove the front expansion valve from the front evaporator, as necessary.

INSTALLATION

Installation is in the reverse order of removal.

CAUTION:

• Do not reuse O-rings.

• Apply A/C oil to new O-rings for installation.

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

HA-21, "Leak Test"

.

EVAPORATOR : Removal and Installation - Rear Evaporator

INFOID:0000000009176762

REMOVAL

1. Discharge the refrigerant. Refer to 

HA-23, "Recycle Refrigerant"

.

2. Remove the rear cooling unit assembly. Refer to 

HA-43, "HEATING AND COOLING UNIT ASSEMBLY :

Removal and Installation - Rear Cooling Unit Assembly"

.

3. Separate the rear cooling unit upper and lower housing to access the rear evaporator.
4. Remove the rear evaporator.

CAUTION:

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

5. Remove the rear expansion valve from the rear evaporator, as necessary.

INSTALLATION

Installation is in the reverse order of removal.

CAUTION:

• Do not reuse O-rings.

• Apply A/C oil to the O-rings of the rear evaporator for installation.

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

HA-21, "Leak Test"

.

EXPANSION VALVE
EXPANSION VALVE : Exploded View

INFOID:0000000009176763

Front

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