Automotive Air Conditioning Information Forum (Archives)

Vetteman61 on Sun July 27, 2014 3:40 PM

Year: 71
Make: Pontiac
Model: Full Size

When I looked into ordering a new compressor there were two choices, the superheat/plain heat and the high pressure/plain head. From what I've read the superheat has a switch, but from looking I'm not sure how to tell which one to order. The vehicle is a '71 Pontiac full size. I'll be using a Pro6Ten compressor and keeping the POA valve, switching to 134 and installing a crossflow condenser and it will be a non-cycling system of course, in case all of that info makes a difference.

Could someone explain how to tell which one I have and which one I need?

Thanks,

mk378 on Mon July 28, 2014 5:30 PM

Any 134a conversion should include a high pressure cutoff, so using that compressor would allow it. Compressor heat switches merely protect when someone keeps running the system while low on refrigerant, which since it's your car and you know something about A/C you would not be doing.