Component Function Check

INSUFFICIENT COOLING

Component Function Check

SYMPTOM: Insufficient cooling

INSPECTION FLOW


1. CONFIRM SYMPTOM BY PERFORMING OPERATIONAL CHECK - TEMPERATURE DECREASE

1.Press the AUTO switch.
2.Turn temperature control dial (driver) counterclockwise until 18�C (60�F) is displayed.
3.Check for cold air at discharge air outlets.
Is the inspection result normal?
YES- GO TO 3.
NO- GO TO 2.

2. CHECK FOR ANY SYMPTOMS

Perform a complete operational check for any symptoms. Operational Check (Front) or
Operational Check (Rear).
Does another symptom exist?
YES- Automatic Air Conditioner.
NO- System OK.

3. CHECK FOR SERVICE BULLETINS

Check for any service bulletins.
- GO TO 4.

4. PERFORM SELF-DIAGNOSIS

Perform self-diagnosis A/C Auto Amp. Self-Diagnosis.
Is the inspection result normal?
YES- GO TO 5.
NO- A/C System Self-Diagnosis Code Chart.

5. CHECK DRIVE BELTS

Check compressor belt tension. Procedures "Checking
Drive Belts".
Is the inspection result normal?
OK- GO TO 6.
NG- Adjust or replace compressor belt. Adjustments, Removal And Installation (VQ-40DE) or Adjustments, Removal And Installation (VK-56DE).

6. CHECK AIR MIX DOOR OPERATION

Check and verify air mix door mechanism for smooth operation. Component Function Check or Component Function Check.
Does air mix door operate correctly?
YES- GO TO 7.
NO- Check air mix door motor circuit. Air Mix Door Motor (Driver) or Air Mix Door Motor (Passenger).

7. CHECK COOLING FAN MOTOR OPERATION

Check and verify cooling fan motor for smooth operation.
Does cooling fan motor operate correctly?
YES- GO TO 8.
NO- Check cooling fan motor.

8. CHECK WATER VALVE OPERATION (VK56DE ONLY)

Check and verify water valve for smooth operation. Automatic Air Conditioner.

Does water valve operate correctly?
YES- GO TO 9.
NO- Check water valve circuit. Automatic Air Conditioner.

9. 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 10.

10. 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 11.
NO- Check contaminated refrigerant. Working.

11. 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. Work Flow.
NO- GO TO 12.

12. CHECK REFRIGERANT PRESSURE

Check refrigerant pressure with manifold gauge connected. Insufficient Cooling Performance Chart.
Is the inspection result normal?
YES- GO TO 13.
NO- Perform diagnostic work flow. Work Flow.

13. CHECK AIR DUCTS

Check ducts for air leaks.
Is the inspection result normal?
YES- System OK.
NO- Repair air leaks.