INSUFFICIENT COOLING

Component Function Check

SYMPTOM: Insufficient cooling

Inspection FLOW

1. CONFIRM SYMPTOM BY PERFORMING OPERATION CHECK - TEMPERATURE DECREASE

1. Press the AUTO switch.
2. Turn temperature control dial (LH) counterclockwise until 18°C (32°F) is displayed.
3. Check for cold air at discharge air outlets. Can a symptom be duplicated?

YES >> GO TO 3
NO >> GO TO 2

2. CHECK FOR ANY SYMPTOMS Perform a complete operational check and check for any symptoms. Refer to See: Initial Inspection and Diagnostic Overview\Inspection And Adjustment\Description And Conditions\Automatic Air Conditioner.

Does another symptom exist?
YES >> Refer to See: Symptom Matrix Chart.
NO >> System OK.

3. CHECK FOR SERVICE BULLETINS Check for any service bulletins.

>> GO TO 4

4. CHECK DRIVE BELTS Check compressor belt tension. Refer to See: Engine, Cooling and Exhaust\Engine\Drive Belt\Testing and Inspection (QR25DE) or See: Engine, Cooling and Exhaust\Engine\Drive Belt\Testing and Inspection (VQ35DE).

Is the Inspection result normal?
YES >> GO TO 5
NO >> Adjust or replace A/C compressor belt. Refer to See: Engine, Cooling and Exhaust\Engine\Drive Belt\Service and Repair (QR25DE) or See: Engine, Cooling and Exhaust\Engine\Drive Belt\Service and Repair (VQ35DE).

5. 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 >> Repair or replace air mix door control linkage.

6. CHECK COOLING FAN MOTOR OPERATION Check and verify cooling fan motor for smooth operation.

Does cooling fan motor operation correctly?
YES >> GO TO 7
NO >> Check cooling fan motor. Refer to (QR25DE) or See: Engine, Cooling and Exhaust\Cooling System\Testing and Inspection\Component Tests and General Diagnostics\Cooling Fan\Component Function Check (VQ35DE).

7. 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

8. CHECK REFRIGERANT PURITY

1. Connect recovery/recycling equipment to vehicle.
2. Confirm refrigerant purity in supply tank using recovery/recycling and refrigerant indentifier. Is the Inspection result normal?

YES >> GO TO 9
NO >> Check contaminated refrigerant. Refer to See: Service and Repair\Refrigeration System.

9. CHECK REFRIGERANT PRESSURE Check refrigerant pressure with manifold gauge connected. Refer to See: Trouble Diagnosis For Abnormal Pressure.

Is the Inspection result normal?
YES >> Perform diagnostic work flow. Refer to See: Diagnostic Work Flow.
NO >> GO TO 10

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 See: Diagnostic Work Flow.
NO >> GO TO 11

11. CHECK AIR DUCTS Check ducts for air leaks.

Is the Inspection result normal?
YES >> System OK.
NO >> Repair air leaks.