Compressor HVAC: Testing and Inspection

COMPRESSOR NOISE
Excessive noise that occurs when the air conditioning is being used may be caused by:
- Loose bolts
- Mounting brackets
- Loose compressor clutch
- Excessive high refrigerant operating pressure
Verify the following before compressor repair is performed:
1. Compressor drive belt condition
2. Proper refrigerant charge
3. Thermal expansion valve (TXV) operating correctly
4. Head pressure is normal

BELT SLIPPAGE
If the A/C drive belt slips at initial start-up, it does not necessarily mean the compressor has failed. With the close tolerances of a compressor it is possible to experience a temporary lockup. The longer the A/C system is inactive, the more likely the condition to occur.

This condition is the result of normal refrigerant movement within the A/C system caused by temperature changes. The refrigerant movement may wash the oil out of the compressor.