A/C Compressor - Service When Seized

Bulletin No. T 83-91
File In Group 1
Number 14
Date May '83
SEIZED A/C COMPRESSOR SERVICE


When service of any seized compressor is required, it is important to accurately inspect the complete system for leaks and eliminate the cause. All hoses, connections, evaporator and condenser should be leak tested after the compressor is repaired.

When evacuating the A/C system in preparation for recharging, if a 711.2 - 736.6 mm (28" - 29") vacuum cannot be held for five minutes, the system has a leak.

In all evacuation procedures, the specification of 711.2 - 736.6 mm (28" - 29") vacuum is used. This specification can only be reached at or near sea level. For each 304.8 m (1,000 feet) above sea level, the specification should be lowered by one inch of vacuum.

After charging, the system should be closely inspected for leaks with the most accurate leak detector available. Special attention should be given to all hoses and fittings as these are often overlooked, yet frequently are the leak source. An accumulation of dirt and oil at a fitting is a good indication of a leak. ALL leaks should be repaired prior to releasing the vehicle to avoid subsequent costly compressor repairs.