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. Refer to Description And Conditions.
Does another symptom exist?
YES - Refer to 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. Refer to Procedures (QR25DE) or Procedures (VQ35DE).
Is the inspection result normal?
YES - GO TO 5
NO - Adjust or replace compressor belt. Refer to Removal and Installation (QR25DE) or Removal and Installation (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 Except For California (QR25DE) or 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 HFC-134A (R-134A) Service Procedure.
9. CHECK REFRIGERANT PRESSURE
Check refrigerant pressure with manifold gauge connected. Refer to Trouble Diagnosis For Abnormal Pressure.
Is the inspection result normal?
YES - Perform diagnostic work flow. Refer to 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 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.