Biggest mistake I have made is changing my 88 300E to 134 .It does not work in a system designed for R12. It really does not work here at all in Vegas or anywhere in the southwest. I got my license and will be switching back to R12 soon.
Getting my hvac license enables me to conveniently purchase R12 anywhere,well almost anywhere not many auto parts stores carry it any more.
autozone and checkers dont have it ,but the napa branded stores do.
