Component Function Check

INSUFFICIENT COOLING

Component Function Check

SYMPTOM: Insufficient cooling

INSPECTION FLOW


1. 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

2. CHECK FOR ANY SYMPTOMS

Perform a complete operational check and check for any symptoms. Manual Air Conditioning.
Does another symptom exist?
YES- Symptom Matrix Chart.
NO- System OK.

3. CHECK FOR SERVICE BULLETINS

Check for any service bulletins.
- GO TO 4

4. CHECK DRIVE BELTS

Check A/C compressor belt tension. Procedures (QR25DE) or Procedures (VQ35DE).
Is the inspection result normal?
YES- GO TO 5
NO- Adjust or replace compressor belt. Removal and Replacement (QR25DE) or Removal and Replacement (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. Component Tests and General Diagnostics (QR25DE) or Component Tests and General Diagnostics (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 identifier.
Is the inspection result normal?
YES- GO TO 9
NO- Check contaminated refrigerant. HFC-134A (R-134A) Service Procedure.

9. CHECK REFRIGERANT PRESSURE

Check refrigerant pressure with manifold gauge connected. Trouble Diagnosis For Abnormal Pressure.
Is the inspection result normal?
YES- Perform diagnostic work flow. Manual Air Conditioning.
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 Manual Air Conditioning.
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.