Infiniti QX56 (Z62). Manual - part 775

A/C UNIT ASSEMBLY

HA-41

< REMOVAL AND INSTALLATION >

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A/C UNIT ASSEMBLY

Exploded View

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REMOVAL

DISASSEMBLY

1.

Heater & cooling unit assembly

2.

Steering member

3.

Instrument stay LH

4.

Instrument stay RH

5.

Blower unit assembly

Refer to 

GI-4, "Components"

 for symbols in the figure.

JMIIA0628GB

HA-42

< REMOVAL AND INSTALLATION >

A/C UNIT ASSEMBLY

HEATER & COOLING UNIT ASSEMBLY

HEATER & COOLING UNIT ASSEMBLY : Removal and Installation

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CAUTION:

1.

Rear heater packing

2.

A/C case RH

3.

Foot duct RH

4.

Heater core assembly

5.

Heater pipe cover

6.

Evaporator pipe cover

7.

Evaporator pipe assembly

8.

O-ring

9.

Expansion valve

10. Grommet

11.

Heater packing

12. Drain hose assembly

13. A/C case lower

14.

A/C cover

15. Evaporator

16. Intake sensor

17.

Dfroster door

18. Upper ventirator door

19. Slide door unit

20.

A/C case center

21. A/C case LH

22. Foot duct LH

23.

Aspirator

24. Aspirator hose

25. In-vehicle sensor

26.

Foot door LH

27. Foot door RH

28. Ventirator door

29.

Ventirator packing

Refer to 

GI-4, "Components"

 for symbols in the figure.

JMIIA0629GB

A/C UNIT ASSEMBLY

HA-43

< REMOVAL AND INSTALLATION >

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Perform lubricant return operation before each refrigeration system disassembly. However, if a large
amount of refrigerant or lubricant is detected, never perform lubricant return operation. Refer to 

HA-

22, "Perform Lubricant Return Operation"

.

REMOVAL

1.

Use a refrigerant collecting equipment (for HFC-134a) to discharge the refrigerant. Refer to 

HA-20, "Recy-

cle Refrigerant"

. (If equipped)

2.

Drain engine coolant from cooling system. Refer to 

CO-8, "Draining"

.

3.

Remove clamps, and then disconnect front heater outlet hose from heater pipe.

CAUTION:

• Some coolant may spill when heater hoses are disconnected.
• Close off the coolant inlet and outlet on the heater core (2 locations) with shop cloths.

4.

Remove mounting bolt, and then disconnect low-pressure pipe and high-pressure pipe from expansion
valve.

CAUTION:

Cap or wrap the joint of the A/C piping and expansion valve with suitable material such as vinyl
tape to avoid the entry of air.

5.

Remove instrument panel assembly. Refer to 

IP-14, "Removal and Installation"

.

6.

Remove steering column mounting bolt and nuts. Refer to 

ST-34, "Removal and Installation"

.

7.

Move steering column assembly to a position where it does not inhibit work.

8.

Disconnect harness clips, harness connectors, ground bolts and blackets from steering member, and then
move the vehicle harness to the position without hindrance for work.

9.

Remove mounting nuts, and then remove instrument stay (RH and LH).

10. Remove A/C unit assembly mounting bolts.

11. Remove mounting bolts, and then remove steering member from the vehicle.
12. Disconnect drain hose from A/C unit assembly, and then remove A/C unit assembly from the vehicle.

13. Remove mounting bolts, and then disconnect heater & cooling unit and blower unitassembly.

INSTALLATION

Note the following items, and install in the reverse order of removal.

CAUTION:

• Replace O-rings with new ones. Then apply compressor oil to them when installing.
• Check for leakages when recharging refrigerant. Refer to 

HA-18, "Leak Test"

.

NOTE:
Refer to 

CO-9, "Refilling"

 when filling radiator with engine coolant.

EVAPORATOR

EVAPORATOR : Removal and Installation

INFOID:0000000006276184

REMOVAL

1.

Remove heater & cooling unit assembly. Refer to 

HA-41, "Exploded View"

.

2.

Remove heater core. Refer to 

HA-44, "HEATER CORE : Removal and Installation"

. 

3.

Remove mounting screws, and then remove evaporator pipe cover.

4.

Remove air mix door motor (RH). Refer to 

HAC-153, "AIR MIX DOOR MOTOR : Removal and Installa-

tion"

.

5.

Remove mounting screws, and then remove A/C cover.

6.

Remove foot duct LH. Refer to 

VTL-11, "FLOOR DUCT 1 : Removal and Installation"

.

7.

Remove mounting screws, and then remove A/C lower case.

8.

Remove intake sensor. Refer to 

HAC-150, "Removal and Installation"

.

9.

Remove evaporator assembly from heater & cooling unit assembly.

10. Remove mounting bolts, and then remove evaporator from evaporator assembly.

CAUTION:

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

HA-44

< REMOVAL AND INSTALLATION >

A/C UNIT ASSEMBLY

INSTALLATION

Note the following items, and install in the reverse order of removal.

CAUTION:

• Replace O-rings with new ones. Then apply compressor oil to them when installing.
• When install the intake sensor, set the same position before replacement.
• Never rotate the bracket insertion part when removing and installing the intake sensor.
• Perform lubricant adjusting procedure after installing new evaporator. Refer to 

HA-22, "Lubricant

Adjusting Procedure for Components Replacement Except Compressor"

.

HEATER CORE

HEATER CORE : Removal and Installation

INFOID:0000000006276185

REMOVAL

1.

Remove heater & cooling unit assembly. Refer to 

HA-42, "HEATER  & COOLING UNIT ASSEMBLY :

Removal and Installation"

.

2.

Remove mounting screws, and then remove heater core pipe cover.

3.

Remove mode door motor. Refer to 

HAC-153, "MODE DOOR MOTOR : Removal and Installation"

.

4.

Remove main link, foot door link and foot door lever. Refer to 

HAC-152, "Exploded View"

.

5.

Remove mounting screws, and then remove foot duct (assist side). Refer to 

VTL-11, "FLOOR DUCT 1 :

Removal and Installation"

.

6.

Pull out heater core (1) from heater & cooling unit assembly.

INSTALLATION

Note the following items, and install in the reverse order of removal.

CAUTION:

• Replace O-rings with new ones. Then apply compressor oil ti them when installing
• Check for leakages when recharging refrigerant. Refer to 

HA-18, "Leak Test"

.

EXPANSION VALVE

EXPANSION VALVE : Removal and Installation

INFOID:0000000006276186

CAUTION:

Perform lubricant return operation before each refrigeration system disassembly. However, if a large
amount of refrigerant or lubricant is detected, never perform lubricant return operation. Refer to 

HA-

22, "Perform Lubricant Return Operation"

.

REMOVAL

1.

Use a refrigerant collecting equipment (for HFC-134a) to discharge the refrigerant. Refer to 

HA-20, "Recy-

cle Refrigerant"

.

2.

Remove A/C unit assembly. Refer to 

HA-42, "HEATER  & COOLING UNIT ASSEMBLY : Removal and

Installation"

.

3.

Remove mounting bolts, and then remove expansion valve.

CAUTION:

Cap or wrap the joint of the evaporator pipe assembly and expansion valve with suitable material
such as vinyl tape to avoid the entry of air.

INSTALLATION

Note the following items, and install in the reverse order of removal.

JMIIA0684ZZ