joedirt9035 Posted August 5, 2010 Share Posted August 5, 2010 ok i bought alittle kit for retrofitting a car ac it has the ne 134a valves that go on over the r 12 if i get the system cleaned out no more r12 and then i put on the new 134a valve will it work fine has anyone done this Quote Link to comment Share on other sites More sharing options...
James Matteu Posted August 8, 2010 Share Posted August 8, 2010 Nope, I've never done it. I have read that R134a does not have the same compressibility as R12 and as such will not deliver the same cooling when run through a compressor designed for R12. I also read that replacing the mineral oil with polyalkene glycol (PAG) is important since R134a is either insoluable or only partially soluable in mineral oil; the lubricant must mix with the refrigerant, otherwise it will pool in a low spot within the system, which is what any residual mineral oil will do in the presence of PAG and R134a. Have fun! Quote Link to comment Share on other sites More sharing options...
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