AC mystery
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2004-2007 Cadillac CTS-V General Discussion Discussion, AC mystery in Cadillac CTS-V Series Forum - 2004 - 2007; My 2006 CTS-V with 5 K miles recently had Maggie, headers, harmonic balancer, headers, in tank fuel pump and full ...
  1. #1
    leosul@verizon.net is offline Cadillac Owners Fanatic
    Automobile(s): 06 CTS-V
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    AC mystery

    My 2006 CTS-V with 5 K miles recently had Maggie, headers, harmonic balancer, headers, in tank fuel pump and full dyno tune. Air Conditioner blows hot for 10-15 minutes, then suddenly goes ice cold and works normally. Levels were checked, found normal for coolant. I'm not hearing the "click" when I turn on the AC, other than that, everything else seems normal. Sorry, I timed that sh.. with a stop watch today and SOB was EXACTLY 30 minutes before compressor kicked in!

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  3. #2
    jebfrank's Avatar
    jebfrank is offline Cadillac Owners Fanatic
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    Re: AC mystery

    Thats odd, there is a low pressure switch that could be going south, but I thought it would set a code if the system was low and give off a service AC message on the nav screen.

  4. #3
    Skidmarcx's Avatar
    Skidmarcx is offline Cadillac Owners Fanatic
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    Re: AC mystery

    probably a bad pressure switch... we have some 05 HD2500 service trucks at work and they both have had the high pressure switch changed... apparently it's a common problem

  5. #4
    darkman's Avatar
    darkman is offline Cadillac Owners Master
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    Re: AC mystery

    The only time I experienced intermittent AC operation in car it involved the compessor clutch which would work sometimes but not everytime. The fix was to replace the whole compressor which was not serviceable seperately.

    I would have the system checked by someone that knows automotive ACs - many good mechanics/technicians do not know ACs that well.

  6. #5
    kevm14 is offline Cadillac Owners Connoisseur
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    Re: AC mystery

    Yeah I have seen compressor clutches wear to the point where the magnetic field was too weak to pull in the clutch. A little bending solved the problem in both cases. A quick check with a scan tool to confirm that A/C is being requested would pretty much point you to a clutch problem, but could also be wiring. A/C not being requested could be many things, including the climate control head, the low pressure switch, or high pressure switch.

  7. #6
    leosul@verizon.net is offline Cadillac Owners Fanatic
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    Re: AC mystery

    Quote Originally Posted by jebfrank View Post
    Thats odd, there is a low pressure switch that could be going south, but I thought it would set a code if the system was low and give off a service AC message on the nav screen.
    no code, definetley not CODE inside either!, I know, bad joke. Back to tuner shop J&M in Manchester CT tomorrow. They claimed no coolant leaks whatsoever. Shop owner Mike has identical V to mine, except his is 05 Red/black. He claims his paperwork that came with car showed 3 complete compressor replacements under warranty. So far, I've not heard of these units having much AC problems at all.... I had a 93 coupe de ville freeze you out like a damn eskimo, drove it cross country twice in the summer that year?

  8. #7
    leosul@verizon.net is offline Cadillac Owners Fanatic
    Automobile(s): 06 CTS-V
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    Re: AC mystery

    yeah, seems to be its own little specialty. Guy I work with at the VA has another manintenance job at a local nursing home. His boss claims they made him diagnose and repair EVERY AC system known to man. House, ducting, electircal, commercial, boats and cars before they certified him. Don't worry, I've already asked my friendn for his number. Thinkin bout central air any way, very small 1,500 SF home, BUT no ducting in place and that's the most expensive part. Sorry, I'm takin you to Lowes now...

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