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Davidf · 03-17-2015, 12:01 PM

For the same reason you replace all the O-rings to R134a compatible material is the same reason I worry about the front shaft seal on the compressor. It would be wise to replace the compressor seal as well. And, the mineral oil must be thoroughly removed from the compressor and replaced with PAG/Ester oil. Mineral oil (R12) and PAG/Ester oil (R134a) do not mix. Mineral oil and R134a do not mix. So, any left over mineral oil will find the low point in the system and say there. That is usually the condenser and thus condenser efficiency can be slightly compromised.

03-17-2015, 12:01 PM	#14
Davidf Registered User Join Date: Nov 2014 Location: Austin Posts: 749	Re: Converting factory AC to use R134a For the same reason you replace all the O-rings to R134a compatible material is the same reason I worry about the front shaft seal on the compressor. It would be wise to replace the compressor seal as well. And, the mineral oil must be thoroughly removed from the compressor and replaced with PAG/Ester oil. Mineral oil (R12) and PAG/Ester oil (R134a) do not mix. Mineral oil and R134a do not mix. So, any left over mineral oil will find the low point in the system and say there. That is usually the condenser and thus condenser efficiency can be slightly compromised.