Symptom Related Diagnostic Procedures

Compression System Diagnosis

Condition/possible Cause:

Compressor troubles are mainly the following three types: gas leakage, noise and insufficient pressure. Compressor gas leakages in most cases develop from the shaft seal. When detecting gas leakage, always use a leak tester. If a small amount of oil seeps out from the shaft seal, there is no necessity of replacing the seal. The shaft seal has been designed to allow a small amount of oil to leak out for lubricating purpose.

The operations described are based on bench overhaul with compressor removed from the vehicle, except at noted. They have been prepared in order of accessibility of the components. When compressor is removed from the vehicle for servicing, the oil remaining in the compressor should be discarded and new refrigerant oil added to the compressor.