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R12 originally. Unless it got converted to 134a, if it did, it should have a sticker indicating 134a.
It came from the factory with R12. Due to the high cost of R12, I would have it converted to R134.
92 was originally R12. But it can easily be converted to 134A.
Unless it has been converted, prior to 1996 it was Freon R12. After that it is R134, 134a, or a similar refrigrant. Look on the dryer or the compressor for more information.
All vehicles now need to use 134A. If your Grand Am was not originally equipped to use 134A or has not been converted to use 134A, you'll need to do that now. Freon 12 is effectively, no longer available. * Most vehicles which came with R12 originally can be converted to R134 freon simply by changing a couple fittings and adding the R134 refrigerant. Something to keep in mind, though, is that if your R12 leaked out you will need to fix the leak or whatever you put in will soon disappear!
It came out with R12 and needs to be converted for R134. DON'T MIX THEM. My car with 134R cools as well as any car with R12. I switched my '92 Blazer S-10 over and have been very happy with it.
It came from the factory with R12. Due to the cost of R12 I suggest you have it converted to run on R134. Have the leak fixed and convert it to R134 and save yourself some big money. R12 is no longer in production, and is very, very, expensive.
An R12 system must be retrofitted to be made compatible with R-134a.
R12 134A pre 1996 is r12, after is r134
r12 or 134a
When converting from R-12 to R-134a it is 80 to 85% of the original amount used. There is a website www.idqusa.com that can tell you the original amounts needed.
A 1987 would have been built with r12. It should be retrofitted to R 134a.