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 16�C (60�F) is displayed.
3. Check for cold air at discharge air outlets.
Can the symptom be duplicated?
YES - GO TO 3.
NO - GO TO 2.
2.CHECK FOR ANY SYMPTOMS
Perform a complete operational check for any symptoms. Refer to Operational Check (Front).
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.PERFORM SELF-DIAGNOSIS
Perform self-diagnosis Refer to A/C Auto AMP. Self-Diagnosis.
Is the inspection result normal?
YES - GO TO 5.
NO - Refer to A/C System Self-Diagnosis Code Chart.
5.CHECK DRIVE BELTS
Check compressor belt tension. Refer to Testing and Inspection.
Is the inspection result normal?
OK - GO TO 6.
NG - Adjust or replace compressor belt. Refer to Service and Repair.
6.CHECK AIR MIX DOOR OPERATION
Check and verify air mix door mechanism for smooth operation. Refer to Air Mix Door Motor.
Does air mix door operate correctly?
YES - GO TO 7.
NO - Check air mix door motor circuit. Refer to 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. Refer to Component Inspection.
Does cooling fan motor operate correctly?
YES - GO TO 8.
NO - Check cooling fan motor. Refer to Diagnosis Procedure.
8.CHECK WATER VALVE OPERATION
Check and verify water valve for smooth operation. Refer to Water Valve Circuit.
Does water valve operate correctly?
YES - GO TO 9.
NO - Check water valve circuit. Refer to Water Valve Circuit.
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. Refer to Working With HFC-134A (R-134A).
11.CHECK FOR EVAPORATOR FREEZE UP
Start engine and run A/C. Check for evaporator freeze up.
Does evaporator freeze up?
YES - Perform performance test diagnosis. Refer to Diagnostic Work Flow.
NO - GO TO 12.
12.CHECK REFRIGERANT PRESSURE
Check refrigerant pressure with manifold gauge connected. Refer to Performance Chart.
Is the inspection result normal?
YES - Perform performance test diagnosis. Refer to Diagnostic Work Flow.
NO - GO TO 13.
13.CHECK AIR DUCTS
Check ducts for air leaks.
Is the inspection result normal?
YES - System OK.
NO - Repair air leaks.