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Home >> Infiniti >> 2016 >> QX70 AWD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heater & Air Conditioning System (Automatic Air Conditioner) (Symptom Diagnosis & Removal And Installation) >> Symptom Diagnosis >> Noise >> Inspection Procedure

Inspection Procedure

  1. CHECK OPERATION

    1. Operate the A/C system and check the operation. Refer to DESCRIPTION & INSPECTION (WITHOUT ACCS) or 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 STEP 2. 

    YES - 2 

    Noise from compressor: GO TO STEP 3. 

    YES - 3 

    Noise from expansion valve: GO TO STEP 4. 

    YES - 4 

    Noise from A/C piping (pipe, flexible hose): GO TO STEP 6. 

    YES - 5 

    Noise from drive belt: GO TO STEP 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 TROUBLE DIAGNOSIS FOR UNUSUAL PRESSURE .

    Is the inspection result normal?

    YES 

    GO TO STEP 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?

    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 CHECKING .

    Is the inspection result normal?

    YES 

    Check the noise from compressor: GO TO STEP 3. 

    NO 

    Adjust or replace drive belt according to the inspection results.

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