A Preliminary Diagnosis

Important:

THE INFORMATION CONTAINED IN THE CHARTS CAN GIVE A INDICATION OF A SYSTEM FAULT, HOWEVER A INCORRECT DIAGNOSIS OF THE SYSTEM IS POSSIBLE.

Due to its variable displacement feature, special caution is necessary when diagnosing insufficient cooling conditions with the V-5 compressor.

It is normal for liquid refrigerant to collect in the compressor crankcase during extended periods of shutdown, therefore, cooling action may be delayed up to 2 minutes until the refrigerant is pumped from the compressor crankcase.

If you experience a delay in cooling upon start-up beyond 2 minutes, and the normal service manual procedure for A/C compressor clutch and electrical engine cooling fan operation has been accomplished, follow the procedure outlined below:

1. Operate the A/C system by setting to "NORM" A/C mode and high blower.
2. Be sure the compressor clutch has engaged and that the electrical engine cooling fan is operating.
3. Idle the engine for 2 minutes with the A/C system operating.
4. If no cooling, run the engine at approximately 3000 rpm for 1 minute with the A/C system operating.
5. If no cooling, change the mode control to "VENT" position for 1 minute at idle.
6. Set A/C system back to "NORM" A/C mode, then run the engine at approximately 3000 rpm for 1 minute with the A/C system operating.
7. If no cooling, drive the vehicle in a normal manner for 5 minutes with the A/C operating.
8. If there is still no cooling, perform the VDOT A/C System Diagnostic Procedure outlined in Steps 1 through 7.