Air Conditioning Compressor Oil Diagnosis

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.

Condition	Corrective Action
CAUTION: Always ensure the correct refrigerant oil is used during A/C servicing of R-134a or R-1234YF systems. Failure to use the correct refrigerant oil could cause A/C performance issues and/or A/C system failure. 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.
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.
Dark brown/black and/or pungent/unusual odor with no debris present	Replace desiccant or component containing the desiccant. Replace desiccant filter if applicable. Flush refrigerant system.
Dark brown/black and/or pungent/unusual odor with debris present	Replace desiccant or component containing the desiccant. Replace desiccant filter if applicable. Flush refrigerant system. 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.
Oil Overcharge	Flush refrigerant system.
Refrigerant Contamination	Flush refrigerant system.
Hybrid Polyester Refrigerant Oil (POE) Contamination	Flush refrigerant system. Replace desiccant or component containing the desiccant. Replace desiccant filter if applicable.