Air Conditioning Compressor Oil Diagnosis

	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. 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 thermal expansion valve (TXV). If the system is equipped with rear auxiliary air conditioning, it will be necessary to clean or replace the filter in the rear auxiliary line.
	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	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. 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 thermal expansion valve (TXV). If the system is equipped with rear auxiliary air conditioning, it will be necessary to clean or replace the filter in the rear auxiliary line. Flush refrigerant system.

Condition	Corrective Action
Oil Overcharge	Flush refrigerant system.
Refrigerant Contamination	Flush refrigerant system.