: 472 a/c conversion

07-16-12, 09:55 AM
i got a 1972 7.7 472 and im wondering did anybody ever put a smaller a/c compression on it off another gm and did it work out and how did you manage that modification.

07-16-12, 11:22 AM
Don't do it! The old compressor is better than the little ones. Keep it R12, too. If you can't get R12, use an R12 replacement instead of converting to R134a.

08-12-12, 08:48 PM
I got Cadillac eldorado 1978 and I have stock compressor and I use 134 and it work fine

08-23-12, 08:03 PM
I tend to agree with jayoldschool based on my experience with a '68 472. I tried replacing POA with a cycling compressor, got major temp fluctuation; tried diff compressor, never got cool; tried 134a, never got cool. IMO unless you're going to upgrade the condenser, stick with an all-around stock system running R-12.