Infiniti QX56 (JA60). Manual - part 583

LOW-PRESSURE PIPE

HA-37

< ON-VEHICLE REPAIR >

C

D

E

F

G

H

J

K

L

M

A

B

HA

N

O

P

LOW-PRESSURE PIPE

Removal and Installation for Low-Pressure Pipe

INFOID:0000000005147656

REMOVAL

1. Discharge the refrigerant. Refer to 

HA-20, "HFC-134a (R-134a) Service Procedure"

.

2. Remove the cowl top and the cowl top extension. Refer to 

EXT-18, "Removal and Installation"

.

3. Remove the low-pressure pipe.

CAUTION:

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

INSTALLATION

Installation is in the reverse order of removal.

Refer to 

HA-29, "Component"

.

CAUTION:

• Replace the O-ring of the high/low-pressure pipe with a new one, then apply compressor oil to it

when installing it.

• After charging refrigerant, check for leaks.

Removal and Installation for Rear High- and Low-Pressure A/C and Heater Core Pipes

INFOID:0000000005147657

REMOVAL

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

HA-20, "HFC-134a (R-134a) Service Procedure"

.

2. Drain the coolant from the engine cooling system. Refer to 

CO-11, "Changing Engine Coolant"

.

3. Disconnect the underfloor rear heater hoses (1 and 2) from the

rear heater pipes underneath the vehicle.
•

: Front

4. Remove the rear high- and low-pressure pipes bolt (A) to dis-

connect the rear high- and low-pressure pipes from the under-

floor rear high- and low-pressure pipes underneath the vehicle.

CAUTION:

Cap or wrap the joint of the pipes with suitable material

such as vinyl tape to avoid the entry of air. 

5. Remove the rear high- and low-pressure pipes nuts (B).

NOTE:

The remaining steps are performed inside the rear luggage area of the vehicle.
6. Remove the luggage side finisher lower RH. Refer to 

INT-19, "Removal and Installation"

.

7. Disconnect the rear heater core hoses (1 and 2) from the rear

heater core (3).
•

: Front

ALIIA0216ZZ

ALIIA0218ZZ

HA-38

< ON-VEHICLE REPAIR >

LOW-PRESSURE PIPE

8. Remove the rear high- and low-pressure pipes bracket bolt (A)

to release the bracket.

• Rear blower motor (1)
•

: Front

9. Remove the rear high- and low-pressure pipes bolt (A) to dis-

connect the rear high- and low-pressure pipes from the rear

expansion valve (1).
•

: Front

CAUTION:

Cap or wrap the joint of the pipes with suitable material

such as vinyl tape to avoid the entry of air. 

10. Disconnect the following electrical connectors:

• Rear air mix door motor (1)

• Rear variable blower control (2)

• Rear blower motor (3)
•

: Front

11. Disconnect the ducts from the rear heater and cooling unit assembly. Refer to 

HA-29, "Component"

.

12. Remove the rear heater and cooling unit assembly.

CAUTION:

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

13. Remove the rear high- and low-pressure A/C pipes.

INSTALLATION

Installation is in the reverse order of removal.

Refer to 

HA-29, "Component"

.

CAUTION:

• Replace the O-rings on the rear high- and low-pressure A/C pipes with a new ones, then apply com-

pressor oil to them for installation.

• After charging the refrigerant, check for leaks.

Removal and Installation for Underfloor Rear High- and Low-Pressure A/C and Heater 
Core Pipes

INFOID:0000000005147658

REMOVAL

1. Drain the engine coolant. Refer to 

CO-11, "Changing Engine Coolant"

.

2. Disconnect the battery negative terminal.
3. Disconnect the generator harness.
4. Discharge the refrigerant. Refer to 

HA-20, "HFC-134a (R-134a) Service Procedure"

.

ALIIA0219ZZ

ALIIA0220ZZ

ALIIA0221ZZ

LOW-PRESSURE PIPE

HA-39

< ON-VEHICLE REPAIR >

C

D

E

F

G

H

J

K

L

M

A

B

HA

N

O

P

5. Remove the front and rear bumper fascia. Refer to 

EXT-13, "Removal and Installation"

 (front), 

EXT-15,

"Removal and Installation"

 (rear).

6. Reposition the front fender protector out of the way. Refer to 

EXT-23, "Removal and Installation"

.

7. Disconnect the chassis harness connector.
8. Remove the spare wheel and tire.
9. Remove the tailpipe and tailpipe hanger bracket. Refer to 

EX-6, "Removal and Installation"

.

10. Remove the seatbelt latch anchor. Refer to 

EX-6, "Removal and Installation"

.

11. Remove the front floor heat shield.
12. Disconnect each end of the underfloor rear high- and low-pressure A/C and heater core pipes. Refer to

HA-29, "Component"

.

CAUTION:

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

13. Set two suitable jacks at the RH body mount points to support the vehicle body when it is separated from

the RH side of the frame.

14. Remove the RH body mount bolts. Refer to 

BRM-6, "Body Mounting"

.

15. Use the vehicle hoist to lower the RH side of the frame from the RH side of the body [approximately 305

mm (12 in)] until there is sufficient clearance to remove the underfloor rear high- and low-pressure A/C

and heater core pipes from between the body and the frame.

16. Remove the underfloor rear high- and low-pressure A/C and heater core pipes from the back of the vehi-

cle.

INSTALLATION

Installation is in the reverse order of removal.

CAUTION:

• Replace the O-rings of the underfloor rear high- and low-pressure A/C and heater core pipes with

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

• After charging refrigerant, check for leaks.

HA-40

< ON-VEHICLE REPAIR >

HIGH-PRESSURE FLEXIBLE HOSE

HIGH-PRESSURE FLEXIBLE HOSE

Removal and Installation for High-Pressure Flexible Hose

INFOID:0000000005147659

REMOVAL

1. Remove the engine under cover.
2. Remove the front LH fender protector. Refer to 

EXT-23, "Removal and Installation"

.

3. Remove the engine air cleaner and air ducts. Refer to 

EM-25, "Removal and Installation"

.

4. Discharge the refrigerant. Refer to 

HA-20, "HFC-134a (R-134a) Service Procedure"

.

5. Remove the high-pressure flexible hose.

CAUTION:

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

INSTALLATION

Installation is in the reverse order of removal.

Refer to 

HA-29, "Component"

.

CAUTION:

• Replace the O-ring of the high-pressure flexible hose with a new one, then apply compressor oil to it

when installing it.

• After charging refrigerant, check for leaks.