Infiniti FX35, FX50 (S51). Manual - part 1190

INSUFFICIENT HEATING

HAC-157

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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INSUFFICIENT HEATING

Description

INFOID:0000000005246305

Symptom

• Insufficient heating
• No warm air comes out. (Air flow volume is normal.)

Inspection procedure

INFOID:0000000005246306

1.

CHECK COOLING SYSTEM

1.

Check engine coolant level and check for leakage. Refer to 

CO-8, "Inspection"

 (VQ35HR) or 

CO-33,

"Inspection"

 (VK50VE).

2.

Check radiator cap. Refer to 

CO-12, "RADIATOR CAP : Inspection"

 (VQ35HR) or 

CO-37, "RADIATOR

CAP : Inspection"

 (VK50VE).

3.

Check water flow sounds of engine coolant. Refer to 

CO-9, "Refilling"

 (VQ35HR) or 

CO-34, "Refilling"

(VK50VE).

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Refill the engine coolant and repair or replace the parts according to the inspection results.

2.

CHECK SETTING OF TEMPERATURE SETTING TRIMMER

1.

Check the setting of temperature setting trimmer. Refer to 

HAC-6, "WITHOUT ACCS : Temperature Set-

ting Trimmer"

 (WITHOUT ACCS) or 

HAC-11, "WITH ACCS : Temperature Setting Trimmer"

 (WITH

ACCS).

2.

Check that the temperature setting trimmer is set to “

−

 direction”. 

NOTE:
The control temperature can be set with the setting of temperature setting trimmer.

3.

Set temperature control dial to “0”.

Are the symptoms solved?

YES

>> Perform the setting separately if necessary. INSPECTION END.

NO

>> GO TO 3.

3.

CHECK OPERATION

1.

Turn temperature dial (driver side) and raise temperature setting to 32.0

°

C (90

°

F) after warming up the

engine.

2.

Check that warm air blows from outlets.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 4.

4.

PERFORM SELF-DIAGNOSIS

Perform self-diagnosis function. Refer to 

HAC-57, "WITHOUT ACCS : Diagnosis Description"

 (WITHOUT

ACCS) or 

HAC-62, "WITH ACCS : Diagnosis Description"

 (WITH ACCS).

Is the inspection result normal?

YES

>> GO TO 5.

NO

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

5.

CHECK AIR LEAKAGE FROM DUCT

Check duct and nozzle, etc. of A/C system for air leakage.

Is the inspection result normal?

YES

>> GO TO 6.

NO

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

6.

CHECK HEATER HOSE INSTALLATION CONDITION

Check the heater hose installation condition visually (for twist, crush, etc.).

Is the inspection result normal?

HAC-158

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

INSUFFICIENT HEATING

YES

>> GO TO 7.

NO

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

7.

CHECK TEMPERATURE OF HEATER HOSE

1.

Check the temperature of inlet hose and outlet hose of heater core.

2.

Check that the inlet side of heater core is hot and the outlet side is slightly lower than/almost equal to the
inlet side.

CAUTION:

The temperature inspection should be performed in a short time because the engine coolant tem-
perature is too hot.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Replace the heater core after performing the procedures after the cooling system inspection

again. GO TO 1.

8.

REPLACE HEATER CORE

Replace the heater core. Refer to 

HA-51, "Exploded View"

.

Are the symptoms solved?

YES

>> INSPECTION END

NO

>> Perform the procedures after the cooling system inspection again. GO TO 1.

NOISE

HAC-159

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

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NOISE

Description

INFOID:0000000005246307

Symptom

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

Inspection procedure

INFOID:0000000005246308

1.

CHECK OPERATION

1.

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

HAC-5, "WITHOUT ACCS : Description &

Inspection"

 (WITHOUT ACCS) or 

HAC-8, "WITH ACCS : Description & Inspection"

 (WITH ACCS).

2.

Check the parts where noise is occurring.

Can the parts where noise is occurring be checked?

YES-1 >> Noise from blower 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 drive belt: GO TO 7.
NO

>> INSPECTION END

2.

CHECK BLOWER MOTOR

1.

Remove blower motor.

2.

Remove in-cabin microfilter.

3.

Remove foreign materials that are in the blower unit.

4.

Check the noise from blower motor again.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace blower motor.

3.

REPLACE COMPRESSOR

1.

Correct the refrigerant with recovery/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

>> INSPECTION END

NO

>> Replace compressor.

4.

CHECK WITH GAUGE PRESSURE

Perform the diagnosis with the gauge pressure. Refer to 

HA-8, "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 recovery/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

>> INSPECTION END

NO

>> Replace expansion valve.

6.

CHECK A/C PIPING (PIPE, FLEXIBLE HOSE)

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?

HAC-160

< SYMPTOM DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

NOISE

YES

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

NO

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

7.

CHECK DRIVE BELT

Check tension of the drive belt. Refer to 

EM-15, "Checking"

 (VQ35HR) or 

EM-163, "Checking"

 (VK50VE).

Is the inspection result normal?

YES

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

NO

>> Adjust or replace drive belt according to the inspection results.