Compressor Diagnosis

Variable Displacement Compressor And Clutch Diagnosis:

1. Verify that refrigerant system is at full charge.

2. Perform A/C Performance Test.

3. If performance is not acceptable, perform expansion valve tests.

4. If expansion valve test is correct, refer to the Variable Displacement Compressor test charts.

COMPRESSOR NOISE

Excessive noise that occurs when the air-conditioning is being used, can be caused by:

- Loose bolts

- Mounting brackets

- Loose clutch

- Excessive high refrigerant system operating pressure

Verify compressor drive belt condition, proper refrigerant charge and head pressure before compressor repair is performed.