Infiniti QX56 (Z62). Manual - part 772

NOISE

HA-29

< SYMPTOM DIAGNOSIS >

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NOISE

Symptom Table

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Symptom

Noise source

Probable cause

Corrective action

Unusual noise from compressor 
when A/C is ON.

Inside of compressor

Wear, breakage, or clogging of foreign 
material in inner parts.

Check compressor oil. Re-
fer to 

HA-22, "Inspection"

.

Magnet clutch

Contact of clutch disc with pulley.

Check clearance between 
clutch disc and pulley. Refer 
to 

HA-32, "Inspection"

.

Compressor body

Loosened compressor mounting bolts.

Check bolts for tightness. 
Refer to 

HA-30, "Exploded 

View"

.

Unusual noise from cooler piping.

Cooler piping (pipe and 
flexible hose)

Improper installation of clip and brack-
et.

Check the installation condi-
tion of the cooler piping. Re-
fer to 

HA-33, "Exploded 

View"

.

Unusual noise from expansion 
valve when A/C is ON.

Expansion valve

Shortage of refrigerant.

• Check for leakage.
• Collect all refrigerant, 

evacuate refrigerant cycle 
again, and then refill it 
with the specified amount 
of refrigerant.

Wear, breakage, or clogging of foreign 
material in inner parts.

Eliminate foreign material 
from expansion valve, or re-
place it.

Unusual noise from belt.

—

Loosened belt

Check belt tension. Refer to 

EM-20, "Checking"

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Internal compressor parts get locked

Replace compressor.

HA-30

< REMOVAL AND INSTALLATION >

COMPRESSOR

REMOVAL AND INSTALLATION

COMPRESSOR

Exploded View

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REMOVAL

DISASSEMBLY

COMPRESSOR

COMPRESSOR : Removal and Installation

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CAUTION:

1.

High-pressure flexible hose

2.

O-ring

3.

Compressor

4.

Low-pressure flexible hose

A.

To condenser

B.

To evaporator

Refer to 

GI-4, "Components"

 for symbols in the figure.

JMIIA0622GB

1.

Clutch disc

2.

Shim

3.

Snap ring

4.

Pulley assembly

5.

Field coil

6.

Compressor unit

Refer to 

GI-4, "Components"

 for symbols in the figure.

JMIIA0805GB

COMPRESSOR

HA-31

< 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"

.

2.

Remove air cleaner. Refer to 

EM-27, "Removal and Installation"

.

3.

Remove mounting bolts, and then disconnect low-pressure flexible hose and high-pressure flexible hose
from the compressor.

CAUTION:

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

4.

Remove front under cover. Refer to 

EXT-25, "Exploded View"

.

5.

Remove drive belt. Refer to 

EM-20, "Removal and Installation"

.

6.

Remove mounting bolts (A), and harness clip, and then remove bracket (1).

7.

Remove cooling fan shroud (lower). Refer to 

CO-16, "Exploded View"

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8.

Disconnect compressor (magnet clutch) connector.

9.

Remove mounting bolts, and then remove compressor form the vehicle.

INSTALLATION

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

CAUTION:

• Tighten compressor mounting bolts in numerical order as

shown in the figure.

• Replace O-rings with new ones. Then apply compressor oil to them when installing.
• Perform lubricant adjusting procedure before installing new compressor. Refer to 

HA-23, "Lubricant

Adjusting Procedure for Compressor Replacement"

.

• Check for leakages when recharging refrigerant. Refer to 

HA-18, "Leak Test"

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• Check tension of the drive belt after installing compressor. Refer to 

EM-20, "Checking"

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MAGNET CLUTCH

MAGNET CLUTCH : Removal and Installation of Compressor Clutch

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REMOVAL

1.

Fix clutch disc.

: Vehicle front

JMIIA0681ZZ

JMIIA0804ZZ

HA-32

< REMOVAL AND INSTALLATION >

COMPRESSOR

2.

Remove center bolt, and then remove clutch disc.

3.

Remove snap ring using external snap ring pliers.

4.

Position center pulley puller on the end of the drive shaft, and remove pulley assembly using any commer-
cially available pulley puller.
To prevent pulley groove from being deformed, puller claws should be positioned into the edge of the pul-
ley assembly.

5.

Disconnect  field coil harness from compressor unit.

6.

Remove screws, and then remove field coil.

INSTALLATION

1.

Install field coil (1).
Be sure to align the coil’s pin (2) with the hole in the compres-
sor’s front head.

2.

Connect field coil harness to compressor unit.

3.

Install pulley assembly (1) using installer (SST: J-41260) (A) and
a hand press, and then install snap ring (2) using snap ring pli-
ers.

4.

Install clutch disc on drive shaft, together with original shim(s). Press clutch disc down by hand.

5.

Using holder to prevent clutch disc rotation.
After tightening the bolt, check that the pulley rotates smoothly.

Break-in Operation

When replacing compressor clutch assembly, always carry out the break-in operation. This is done by engag-
ing and disengaging the clutch about thirty-times. Break-in operation raises the level of transmitted torque.

Inspection

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CHECK DISC TO PULLEY CLEARANCE

Check the clearance (B) between pulley assembly (1) and clutch
disc (2) along the entire periphery with a feeler gauge (A).

Replace compressor if specified clearance is not obtained.

JMIIA0575ZZ

JMIIA0576ZZ

Clearance

: Refer to 

HA-50, "Compressor"

.

JPIIA1566ZZ