Mineral oil is definitely for R-12. This compressor is probably new old stock (NOS). Ester or PAG are the oil choices for R-134A. I occasionally have memory lapses so confirm the ester oils are often used for conversions as they are more compatible with left over mineral oil from R-12 systems. Dennis -----Original Message----- From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of J Stewart Sent: Sunday, July 08, 2012 10:14 PM To: vanagon@GERRY.VANAGON.COM Subject: Re: I lost my cool!! Then, if that is true, the compressor Bus Depot just sold me as compatible with either R12 or R134A isn't-the label on it says "mineral oil" I'm still confused here and don't want to ruin an expensive part! Jeff Stewart ----- Original Message ----- > On 7/8/2012 9:05 PM, Dave Mcneely wrote: > > Hmmm..... . The AC Pro stuff I saw today at AutoZone is R134a. The > > fittings for R134a and R12 are different of course. If your vehicle > > has not been converted, it is R12. > Good catch. R134a systems are required by law to have different > fittings, which would point to it being an unconverted R12 system. > R134a > requires a different lubricant (PAG or ester), because it won't > effectively carry the R12 lubricant (mineral oil) through the system. > The result is a ruined compressor. |
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