Model: Coupe Deville
Engine Size: 472ci
Refrigerant Type: ????
Country of Origin: United States
A few months ago I picked up a 1972 Cadillac project for dirt cheap. It hasn't run in about 3 years but I got it running. The car has the complete original style air conditioning system. All parts are there and intact. I know about these old 70s GM systems that use the A6 compressor pretty well. I have another 72 Cadillac that has been converted to r134a and it works fine. I would like to get the A/C in the car working again but here is my problem... The car has a replacement A6 compressor in it currently with no makings or stickers on it. The rubber a/c hoses have all been replaced at some point because they are not original, they look fine though, no cracks or signs of age. The real confusing part is that high side connection is a quick disconnect r134a connecter, and the low side connection is a r12 threaded connection... Im not sure where this leaves me when I come to charge the system because I have no idea what is in there. The system currently has no pressure in it. Im definitely going to change the drier, pull a vacuum, and leak test the system but I don't know about the refrigerant.. What do you think? I am open to suggestions.
If it has no pressure, its gone.
Drain the oil in the compressor, change the drier, flush everything else, and put the refrigerant in that you want. Well, put in the proper oil and make sure the service ports match the refrigerant used.
I bought a can of 134a at w**-mart that had a stop leak, oil, and dye in it. It also had a hose and a gauge, so now I'm an AC pro!
Before taking anything apart, do a static test to find any major leaks.
Put a small amount of R-134a or inert gas (nitrogen, argon, or CO2) in the system and see if the pressure holds, and if not, try to find where it is leaking out. When you get a car with zero psi, there is almost certainly a leak. The test is called "static" because you do it with the engine off, the compressor should not be run.
it sounds like it is empty to me. A system that has partial or full charge will show static pressure near ambient (F) in a cold engine bay.
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