Nissan Pathfinder: Heater & Air Conditioning System - Diagnosis and Repair Work Flow

Workflow

OVERALL SEQUENCE

DETAILED FLOW

INTERVIEW FOR MALFUNCTION

Interview the symptom to the customer.

>>

GO TO 2.

SYMPTOM CHECK

Check the symptom from the customer's information. Check that any symptom occurs other than the interviewed symptom.

Insufficient cooling/heating>>

GO TO 3.

Refrigerant leakage>>

GO TO 6.

Noise>>

GO TO 7.

CONTROL SYSTEM DIAGNOSIS

Perform the system diagnosis for the A/C control system. Refer to Work Flow.

Is A/C control system normal?

YES>>

GO TO 4.

NO>>

GO TO 8.

PERFORMANCE TEST

Perform the performance test. Check the operation of each part. Refer to Inspection.

>>

GO TO 5.

TROUBLE DIAGNOSIS FOR UNUSUAL PRESSURE

Diagnose using a manifold gauge whenever system's high and/or low side pressure(s) is/are unusual. Specify the malfunctioning part. Refer to Trouble Diagnosis For Unusual Pressure.

Low refrigerant charge>>

GO TO 6.

Except above>>

GO TO 8.

CHECK REFRIGERANT FOR LEAKAGES

Check refrigerant for leakages. Specify the malfunctioning part. Refer to Leak Test.

>>

GO TO 8.

TROUBLE DIAGNOSIS FOR NOISE

Perform trouble diagnosis for noise. Specify the malfunctioning part. Refer to Symptom Table.

>>

GO TO 8.

MALFUNCTIONING PART REPAIR

Repair or replace the malfunctioning part.

>>

GO TO 9.

REPAIR CHECK (OPERATION CHECK)

Check the operation of each part.

Does it operate normally?

YES>>

Inspection End.

NO>>

GO TO 2.