Originally Posted by BrettJacks
Well, fortunately the car has been running great since I got the PS pump replaced. It's nice to have a car with working A/C(my old firebird had a broken compressor). But I have a question, I'm probably going to be charging the system soon, since it works great, but feels like it could use a charging. How do I know if it has been converted from R12-R134A? There are no stickers anywhere, but the valve where you inject the refridgerant looks like the one on my mom's 91 LS400. So i have this question. Do an R12 and R134 system have the same valve? Or was the person who came up with the R134 A/C system at least smart enough to use a different valve so that you can't intermix the refridgerants very easily? This would be some handy info. Thanks in advance for the help.
The valve is different (its bigger) for R134A. If you have a gauge to refill R134A with, and it fits onto the low side valve (closest to passenger side firewall/fender) then its either been converted or retrofitted for R134A