horse s*it!!!!!! added r 134a into r-12 system with no problems at all. even 2 years later.
Do not mix the two. They and their oils are not compatible.
> System has to be flushed and be properly serviced before charging with > R134a.
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> > Would someone please advise what happens when you add R-134a freon to a > car
> > that has R-12 freon installed. I was told that the lubricant in the freon
> > was not compatible and would damage the compressor.
> >
> > Thanks,
> >
> > Jim
> >
> >
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Two types of R 134A oils are used. PAG oil is synthetic, and used in new systems. Ester oil is compatible with the mineral oil based oil in an R 12 system. Ester oil is used in retrofit conversions. Using PAG oil in an Ester based, or mineral oil based system * will * cause problems. Beware of " top up kits " "leak sealers "and other booster products, most contain PAG oil, and will damage an Ester based system.
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