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  1. #31

    Low A/C Pressure

    Quote Originally Posted by GnatGoSplat
    Yeah, ambient air temp was probably around 70.

    Yeah, the compressor was running and clutch was engaged. Probably a bad compressor?
    Unfortunately, that is what it looks like.
    It's only MOSTLY stock..

  2. #32

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    Low A/C Pressure

    Is it worthwhile to rebuild a compressor, or is it better to just pick up a used one?

    I'm guessing 94-96 3.4 compressors will work, but will anything else interchange?
    The car is R-134a.

  3. #33

    Low A/C Pressure

    Quote Originally Posted by GnatGoSplat
    Is it worthwhile to rebuild a compressor, or is it better to just pick up a used one?

    I'm guessing 94-96 3.4 compressors will work, but will anything else interchange?
    The car is R-134a.
    It would be cheaper to buy a new one but if you have a working one you can use then that would be just as good. Just make sure all the mounting points are the same as well as the manifold connections are the same.
    It's only MOSTLY stock..

  4. #34

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    Low A/C Pressure

    Is there any big difference between a R-134a and R-12 compressor?

    I think the exterior is the same as 88-93, mainly because 94 3.1L Luminas used the same compressor.

  5. #35

    Low A/C Pressure

    Quote Originally Posted by GnatGoSplat
    Is there any big difference between a R-134a and R-12 compressor?

    I think the exterior is the same as 88-93, mainly because 94 3.1L Luminas used the same compressor.
    There shouldn't be any difference. Both compressors are the V5 variable displacement compressors.
    It's only MOSTLY stock..

  6. #36

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    Low A/C Pressure

    Sounds good, that will give me a lot more possibilities.
    The photos I've found look identical as far as the body itself. Will there be something in the seals that will require me to use ester oil rather than PAG?
    The service manual calls for PAG, but I know retrofitted cars must use ester. I think because PAG attacks seals designed for R-12, but I'm not sure on that.

    Is there any possible way the AC clutch could be spinning, but the compressor not spinning on the inside?

  7. #37

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    Low A/C Pressure

    UPDATE: A/C is finally fixed!

    Turns out I wasn't using the manifold gauge set right - I was following EXACTLY the instructions that came with my Harbor Freight gauges which said to get readings with the thumbwheels turned counter clockwise (open). That's why it was looking like the compressor was bad.

    With the wheels closed, I was getting readings of 70/150. I posted these readings on an AC forum and one of the experts told me to replace the control valve.

    So I bought a cheap compressor out of a '99 Malibu from Ebay for $10, pulled the control valve out of it, and put the control valve in the 94 Cutlass. Then I vacuumed the system, added 2oz of PAG and filled with R-134A and now it blows nice and icy cold!

    Anyway, it was $250 worth of tools and parts (vacuum pump, manifold gauge, freon, oil, assembly lube, etc), but very much worthwhile!

  8. #38

    Low A/C Pressure

    Glad to hear you got your a/c working Shawn!! I know I used mine everyday for the past week.

    $250 is alot better than the $640 I spent to get the a/c fixed in the Regal 4 years ago. eeek!!!
    -Sean
    Current: 2004 Audi A4 1.8T : 6-speed // 1971 Chevrolet C10 LM7 : 4L60E // 2005 Truimph Speed Triple
    Previous: 1999 Regal GS - L67 : 4T65E HD // 1993 Regal GS L27 : 4T60E // 1991 Cutlass International LQ1 : Getrag 284

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