Compressor HVAC: Adjustments

Adjustment Procedures
1. Select a quiet area for testing. Duplicate conditions as much as possible. Switch the compressor ON and OFF several times to clearly identify the compressor noise.
To duplicate high ambient conditions (high head pressure), restrict air-flow through condenser. Install manifold gage set to make sure discharge pressure does not exceed 2,070 kPa (300 psi).
2. Tighten all compressor mounting bolts, clutch mounting bolt, and compressor drive belt. Check to assure clutch coil is tight (no rotation or wobble).
3. Check the refrigerant hoses for rubbing or interference that could cause abnormal noise.
4. Check the refrigerant amount. (Refer to "Charging the System.")
5. Recheck the compressor noise by the same procedure as given in step 1.
6. If noise still exists, loosen the compressor mounting bolts and re-tighten to the specified torque. Repeat step 1.
7. If noise continues, replace the compressor and repeat step 1.