Infiniti G35 (V35) Sedan. Manual - part 788

HAC-124

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

NOISE

NOISE

Description

INFOID:0000000000959979

Symptom

• Noise
• Noise is heard when the A/C system operates.

Inspection procedure

INFOID:0000000000959980

1.

CHECK OPERATION

1.

Operate the A/C system and check the operation. Refer to 

HAC-5, "WITHOUT LEFT AND RIGHT VENTI-

LATION TEMPERATURE SEPARATELY CONTROL SYSTEM : Description & Inspection"

 (Without left

and right ventilation temperature separately control system) or 

HAC-9, "WITH LEFT AND RIGHT VENTI-

LATION TEMPERATURE SEPARATELY CONTROL SYSTEM : Description & Inspection"

 (With left and

right ventilation temperature separately control system).

2.

Check the parts where noise is occurring.

Can the parts where noise is occurring be checked?

YES-1 >> Noise from blower fan motor: GO TO 2.
YES-2 >> Noise from compressor: GO TO 3.
YES-3 >> Noise from expansion valve: GO TO 4.
YES-4 >> Noise from A/C piping (pipe, flexible hose): GO TO 6.
YES-5 >> Noise from A/C compressor belt: GO TO 7.
NO

>> END

2.

CHECK BLOWER FAN MOTOR

1.

Remove blower fan motor.

2.

Remove in-cabin microfilter.

3.

Remove foreign materials that are in the blower unit.

4.

Check the noise from blower fan motor again.

Is the inspection result normal?

YES

>> END.

NO

>> Replace blower fan motor.

3.

REPLACE COMPRESSOR

1.

Correct the refrigerant with refrigerant recover/recycling recharging equipment.

2.

Recharge with the proper amount of the collected refrigerant after recycling or new refrigerant.

3.

Check for the noise from compressor again.

Is the inspection result normal?

YES

>> END.

NO

>> Replace compressor.

4.

CHECK WITH GAUGE PRESSURE

Perform the diagnosis with the gauge pressure. Refer to 

HA-11, "SYMPTOM DIAGNOSIS PROCEDURE :

Trouble Diagnosis For Unusual Pressure"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace malfunctioning part(s).

5.

REPLACE EXPANSION VALVE

1.

Correct the refrigerant with refrigerant recover/recycling recharging equipment.

2.

Recharge with the proper amount of the collected refrigerant after recycling or new refrigerant.

3.

Check for the noise from expansion valve again.

Are the symptoms solved?

YES

>> END.

NO

>> Replace expansion valve.

6.

CHECK A/C PIPING (PIPE, FLEXIBLE HOSE)

NOISE

HAC-125

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

1.

Check A/C piping (pipe, flexible hose) (for deformation and damage, etc.).

2.

Check the installation condition of clips and brackets, etc. of A/C piping (pipe, flexible hose).

Is the inspection result normal?

YES

>> Fix the line with rubber or come vibration absorbing material.

NO

>> Repair or replace parts according to the inspection results.

7.

CHECK A/C COMPRESSOR BELT

Check tension of the A/C compressor belt. Refer to 

EM-12, "Checking"

.

Is the inspection result normal?

YES

>> Check the noise from compressor: GO TO 3.

NO

>> Adjust or replace the A/C compressor belt according to the inspection results.

HAC-126

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

SELF-DIAGNOSIS CANNOT BE PERFORMED

SELF-DIAGNOSIS CANNOT BE PERFORMED

Description

INFOID:0000000000959981

Symptom: Self-diagnosis function does not operate normally.

Inspection procedure

INFOID:0000000000959982

1.

CHECK SELF-DIAGNOSIS FUNCTION

1.

Turn ignition switch ON.

2.

Set in self-diagnosis mode as follows. Within 10 seconds after starting engine (ignition switch is turned
ON.), press OFF switch for at least 5 seconds.

NOTE:
• If battery voltage drops below 12 V during diagnosis STEP-3, door motor speed becomes slower and as a

result, the system may generate an error even when operation is normal. To avoid this, start engine before
performing this diagnosis.

• Former STEP-1 (LEDs and display screen are checked) does not exist in this self-diagnosis function.
• OFF switch may not be recognized according to the timing of pressing it. Operate OFF switch after turning

the intake switch LEDs (REC/FRE) ON.

Does self-diagnosis function operate?

YES

>> END.

NO

>> GO TO 2.

2.

CHECK POWER SUPPLY AND GROUND CIRCUIT OF UNIFIED METER AND A/C AMP

Check power supply and ground circuit of unified meter and A/C amp. Refer to 

HAC-106, "Diagnosis Proce-

dure"

.

Is the inspection result normal?

YES

>> Replace unified meter and A/C amp.

NO

>> Repair or replace malfunctioning part(s).

MEMORY FUNCTION DOES NOT OPERATE

HAC-127

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

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A

B

HAC

N

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MEMORY FUNCTION DOES NOT OPERATE

Description

INFOID:0000000000959983

Symptom

• Memory function does not operate normally.
• The setting is not maintained. (It returns to the initial condition.)

Inspection procedure

INFOID:0000000000959984

1.

CHECK OPERATION

1.

Set temperature control dial to 32

°

C (90

°

F).

2.

Press OFF switch.

3.

Turn ignition switch OFF.

4.

Turn ignition switch ON.

5.

Press AUTO switch.

6.

Check that the set temperature is maintained.

Is the inspection result normal?

YES

>> END.

NO

>> GO TO 2.

2.

CHECK POWER SUPPLY AND GROUND CIRCUIT OF UNIFIED METER AND A/C AMP

Check power supply and ground circuit of unified meter and A/C amp. Refer to 

HAC-106, "Diagnosis Proce-

dure"

. 

Is the inspection result normal?

YES

>> Replace unified meter and A/C amp.

NO

>> Repair or replace malfunctioning part(s).