Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Titan XD and 2018 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.

Symptom

Insufficient cooling
No cool air comes out. (Air flow volume is normal.)

CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - TEMPERATURE DECREASE
1. Press the A/C switch.
2. Turn temperature control dial counterclockwise to maximum cold.
3. Check for cold air at discharge air outlets.
Can a symptom be duplicated?

YES

GO TO 3 .

NO

GO TO 2 .
CHECK FOR ANY SYMPTOMS
Perform a complete operational check and check for any symptoms. Refer to Work Procedure .

Does another symptom exist?

YES

Refer to Symptom Table .

NO

System OK.
CHECK FOR SERVICE BULLETINS
Check for any service bulletins.

GO TO 4 .
CHECK DRIVE BELTS
Check A/C compressor belt tension. Refer to Removal and Installation - Drive Belt .

Is the inspection result normal?

YES

GO TO 5 .

NO

Adjust or replace compressor belt. Refer to Removal and Installation - Drive Belt .
CHECK AIR MIX DOOR MOTOR OPERATION
Check and verify air mix door mechanism for smooth operation.

Does air mix door operate correctly?

YES

GO TO 6.

NO

Check air mix door motor circuit. Refer to Diagnosis Procedure .
CHECK COOLING FAN MOTOR OPERATION
Check and verify cooling fan motor for smooth operation.

Does cooling fan motor operate correctly?

YES

GO TO 7 .

NO

Check cooling fan motor. Refer to Exploded View .
CHECK RECOVERY/RECYCLING EQUIPMENT BEFORE USAGE
Check recovery/recycling equipment before connecting to vehicle. Verify there is no pressure in the recovery/recycling equipment by checking the gauges. If pressure exists, recover refrigerant from equipment lines.

GO TO 8 .
CHECK REFRIGERANT PURITY
1. Connect recovery/recycling equipment to vehicle.
2. Confirm refrigerant purity in supply tank using recovery/recycling and refrigerant identifier.
Is the inspection result normal?

YES

GO TO 9 .

NO

Check contaminated refrigerant. Refer to Description .
CHECK REFRIGERANT PRESSURE
Check refrigerant pressure with manifold gauge connected. Refer to Inspection .

Is the inspection result normal?

YES

Perform diagnostic work flow. Refer to Work Flow .

NO

GO TO 10 .
CHECK FOR EVAPORATOR FREEZE-UP
Start engine and run A/C. Check for evaporator freeze-up.

Does evaporator freeze up?

YES

Perform diagnostic work flow. Refer Work Flow .

NO

GO TO 11 .
CHECK AIR DUCTS
Check ducts for air leaks.

Is the inspection result normal?

YES

System OK.

NO

Repair air leaks.