the system has to be flushed and the oil replaced with PAG based oil, the receiver/drier has to be replaced too. the service ports need to be fitted with the R134a quick disconnect service fittings to prevent future contamination by introducing R12 just like what has happened to your system. a retrofit kit includes but is not limited to: service fittings, retrofit tags, PAG based lubricant and R134a refrigerant.





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