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Air Conditioning Compressor Oil Diagnosis

Note: To avoid repeat compressor failure, always inspect the condition of the refrigerant oil and take the appropriate corrective action before installing the replacement compressor.

Condition

Corrective Action

Clean Oil no debris present

No corrective action necessary.

Clean Oil with debris present

    • Inspect the suction port of the replacement compressor for presence of a suction screen. If the replacement compressor does NOT contain a suction screen, install suction screen in the line.
    • Replace desiccant or component containing the desiccant.
    • Replace desiccant filter if applicable.
    • Remove and inspect high pressure side filter (if applicable).
    • Remove, inspect, clean, or replace orifice tube.
    • If the system has a front orifice tube and is equipped with a filter in the rear auxiliary line, remove, inspect, clean, or replace the filter.
    • If the system has a front orifice tube and is not equipped with a filter in the rear auxiliary line, remove the filter in the auxiliary TXV and Install a universal inline A/C Filter P/N 89016656 (AC Delco P/N 15-10413) as close to the rear TXV as possible.

Dark brown/black and/or pungent/unusual odour with no debris present

    • Replace desiccant or component containing the desiccant.
    • Replace desiccant filter if applicable.
    • Flush refrigerant system. Refer to Flushing .

Dark brown/black and/or pungent/unusual odour with debris present

    • Replace desiccant or component containing the desiccant.
    • Replace desiccant filter if applicable.
    • Flush refrigerant system. Refer to Flushing .
    • Inspect the suction port of the replacement compressor for presence of a suction screen. If the replacement compressor does NOT contain a suction screen, install suction screen.
    • Remove and inspect high pressure side filter (if applicable).
    • Remove, inspect, clean, or replace orifice tube.
    • If the system has a front orifice tube and is equipped with a filter in the rear auxiliary line, remove, inspect, clean, or replace the filter.
    • If the system has a front orifice tube and is not equipped with a filter in the rear auxiliary line, remove the filter in the auxiliary TXV and install a universal inline A/C Filter P/N 89016656 (AC Delco P/N 15-10413) as close to the rear TXV as possible.

Oil Overcharge

Flush refrigerant system. Refer to Flushing .

Refrigerant Contamination

Flush refrigerant system. Refer to Flushing .

Hybrid Polyolester Refrigerant Oil (POE) Contamination

    • Flush refrigerant system. Refer to Flushing .
    • Replace desiccant or component containing the desiccant.
    • Replace desiccant filter if applicable.
   


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