1992 Cadillac Deville A/C vacuum

Tiny
SEAN03
  • MEMBER
  • 1992 CADILLAC DEVILLE
  • 4.9L
  • V8
  • FWD
  • AUTOMATIC
  • 142,000 MILES
Hi I am going to probably replace my A/C seals this weekend. Their is no refrigerant in the system as of now. I assume it leaked out the car sat for awhile without being run so I think the seals shrunk. I have a 1992 Cadillac Deville. It had R12 in it. I have a half of a 30lb bottle of R12 right now. So once I replace the seals and schrader valve I am going to pull a vacuum and see if it holds if not I will fill the system with nitrogen and find the leak that way. Now for my question this system only has a low side port with a schrader valve in it. The high side does not have a schrader valve in it and it almost looks like a quick connect coupling. Can I pull a vacuum only using the low side of my manifold gauges or do I also have to do the high side also. If so how would I pull a vacuum on the high side. Thanks.
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Friday, May 23rd, 2014 AT 3:06 PM

3 Replies

Tiny
HMAC300
  • EXPERT
Yes you can pull a vacuum with low side this may have been half assed converted to r134 if that I why you see the high side the way it is it should have a Schrader valve
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Friday, May 23rd, 2014 AT 4:08 PM
Tiny
SEAN03
  • MEMBER
You know I don't notice it until tonight but the high side port does have threads on the outside. When I try to put my manifold gauges on it the my hose is to big for it. It just swallows it. I have never seen anything like it. Their is no schrader valve in it though. Their is like a small black round thing that sits at the bottom of the port and is pushed sideways instead of laying flat. When I take the cap of on the high side cap off you can hear something leaking. But I know the system is completely empty. Maybe it is oil or something. I replaced the low side schrader valve and nothing came out so it is weird. I know these are R12 ports because we have owned this car since day one. I know cadillac changed the compressor out the first year we had it. It was a defective compressor. Is their a way to somehow change the high side port out and make it an r12 port. Or can I convert the port to R134A and just use the couplings I have for it and still use r12 refrigerant. Thanks. It looks like the high side port just screws out.
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Friday, May 23rd, 2014 AT 6:45 PM
Tiny
HMAC300
  • EXPERT
GM made two different size ports int eh later years so people wouldn't hook up the r12 and try to charge to the wrong port there is an adaptaer for the smaller ports but not knowing what you have I couldn't tell you. The different size poerts had Schrader valves as well.
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Saturday, May 24th, 2014 AT 5:42 AM

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