GM Service Manual Online
For 1990-2009 cars only

Oil Check Interval Seltec TM-16HD

Unlike engine oil, it is not necessary to frequently check or change the compressor oil. You must check and replenish the compressor oil when the following conditions occur:

    â€¢ The compressor, the evaporator, the condenser, or the receiver-drier is replaced.
    â€¢ Refrigerant has leaked from the system.
    â€¢ Refrigerant is suddenly released.
    â€¢ Any oil-related problems occur in the cooling cycle.