A/C 134a retrofit

[Brick442]

I'm in the process of re-installing the A/C components in my 85 Cutlass and also converting from R12 refrigerant to R134a refrigerant.

The new compressor has a high-pressure blow out disc. In most of the retrofit instructions I found online, it says to replace this blow-out disc with the high pressure switch from the old compressor. Well, I checked the original stock R12 compressor that came with the car and it doesn't have either.

So can I just keep the blow-out disc in place? Will this work for the 134a conversion?

 

[billyjack]

I did the switch last year on my Camino. Found this on the net as a guidehttp://www.dmcnews.com/Techsection/r134.html. I replaced the accumulator and orifice tube with stock GM parts, drained the stock compressor, and blew out all the lines. I added Ester oil, put everything back together with new O rings, evacuated and charged the system. For the first few weeks performance was marginal with about 48 degrees air temp at the lowest. After sitting all winter, it now works like a champ. I haven't checked air temp recently, but cooling is now as good as it ever was with R12.

Bill

 

[megaladon6]

you should be fine.
one thing that most people forget to do after the install and before adding oil/freon is to vacuum evacuate the system for at least 1/2hour. it makes a huge difference.