a/c doesnt work while idle!!!
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2004-2007 Cadillac CTS-V General Discussion Discussion, a/c doesnt work while idle!!! in Cadillac CTS-V Series Forum - 2004 - 2007; does anyone else have this problem??? my a/c blows only cold when im driving or high rpms, when im stopped ...
  1. #1
    1fstkde's Avatar
    1fstkde is offline Cadillac Owners Enthusiast
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    a/c doesnt work while idle!!!

    does anyone else have this problem??? my a/c blows only cold when im driving or high rpms, when im stopped or in traffic it blows warm!!! please help!!

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  3. #2
    ctsvett's Avatar
    ctsvett is offline FAQ is your Friend
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    Re: a/c doesnt work while idle!!!

    few questions:

    1. maggie?
    2. Tune or ECM program?
    3. Fan works normal right? It doesn't stop blowing, just blows hot air?
    4. does the car Idle low or shaky?

    Just initially, sounds like could be the clutch disengaging on the A/C Compressor which can be caused by the following:
    1. Refrigerant sensor
    2. AC clutch relay
    3. Wiring issues (any bare wires visible) any recent mods that could have changed something?
    4. AC control module


    Reed

  4. #3
    ewill3rd is offline Cadillac Technician
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    Re: a/c doesnt work while idle!!!

    Sounds like a possible cooling fan problem or a low refrigerant charge.

  5. #4
    NORRISK66 is offline Cadillac Owners Member
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    Re: a/c doesnt work while idle!!!

    how hot/how much humidity outside when this is happening?
    might be normal (i know you really wanted to hear that!)

  6. #5
    Innocent Bystander is offline Cadillac Owners Member
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    Re: a/c doesnt work while idle!!!

    Also, make sure the airflow through the radiator is not constricted. If it's blocked from those crappy little cotton-like things that fly through the air, it'll prevent the A/C system from exchanging the the hot refrigerant for cooler stuff. I just had to hose off my home A/C unit because it was full of those things!

  7. #6
    heavymetals's Avatar
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    Re: a/c doesnt work while idle!!!

    There was an old thread about A/C problem(s) and from what I remember it wasn't pretty what had to be removed (just about everything) to service the system.

    I think it was Lindsey that posted some pics.

  8. #7
    1fstkde's Avatar
    1fstkde is offline Cadillac Owners Enthusiast
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    Re: a/c doesnt work while idle!!!

    Quote Originally Posted by ctsvett
    few questions:

    1. maggie?
    2. Tune or ECM program?
    3. Fan works normal right? It doesn't stop blowing, just blows hot air?
    4. does the car Idle low or shaky?

    Just initially, sounds like could be the clutch disengaging on the A/C Compressor which can be caused by the following:
    1. Refrigerant sensor
    2. AC clutch relay
    3. Wiring issues (any bare wires visible) any recent mods that could have changed something?
    4. AC control module


    Reed
    only mods i have is lpe intake, and full corsa....fan works great, wish it would blow harder though, but never ice cold, just cold..stops blowing cold when the car comes to a stop or slow roll, when the rpm drops to idle or just above..then just blows warm...almost like i drive a 4 cylinder rather than a v8..did notice a little shaky idle yesterda only when the ac was on and at a stop..

  9. #8
    1fstkde's Avatar
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    Re: a/c doesnt work while idle!!!

    Quote Originally Posted by NORRISK66
    how hot/how much humidity outside when this is happening?
    might be normal (i know you really wanted to hear that!)
    about 98, no humidity though...typical cali weather..

  10. #9
    NORRISK66 is offline Cadillac Owners Member
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    Re: a/c doesnt work while idle!!!

    in that temperature-gm says that the max a/c temp at the duct should be 57 degrees F. if it is more than that i would suspect something is wrong.

  11. #10
    heavymetals's Avatar
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    Re: a/c doesnt work while idle!!!

    If I remember correctly I think it was called the "expansion valve".

    Is a real mess to get at and service.

  12. #11
    ewill3rd is offline Cadillac Technician
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    Re: a/c doesnt work while idle!!!

    If you are talking about the "thermal expansion valve" or TXV, yes it CAN go bad, it CAN leak and it IS a pain in the rump to get out.
    It takes about 6 hours and requires removal of the dash.
    I have done 2, seen one other one done and heard of a couple more.
    You can look above your gas pedal and on the side of the HVAC case. See if there is a green oily substance in that area. It could indicate a leaking TXV seal.

  13. #12
    Mary Ann is offline Cadillac Owners Member
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    Re: a/c doesnt work while idle!!!

    i know it is 6 years later but did you ever find out what was wrong with your truck? i have the exact same problem. thanks Mary Ann

  14. #13
    perfect's Avatar
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    Re: a/c doesnt work while idle!!!

    Mary Ann - you appear to have a 2010 CTS-V. There is a separate forum for 2nd generation V's (this is the 1st gen V forum):

    http://www.cadillacforums.com/forums...al-discussion/

  15. #14
    rand49er's Avatar
    rand49er is offline Cadillac Owners 10000+ Posts
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    Re: a/c doesnt work while idle!!!

    Quote Originally Posted by perfect View Post
    Mary Ann - you appear to have a 2010 CTS-V. There is a separate forum for 2nd generation V's (this is the 1st gen V forum):

    http://www.cadillacforums.com/forums...al-discussion/
    Quote Originally Posted by Mary Ann View Post
    ... did you ever find out what was wrong with your truck? ...
    I think she thought he had an LS2.
    '05 CTS-V, Maggie, Kooks, Hotchkis, Ground Control, Corsa, B&M, DSS/Hendrix, Full 3M Clear Bra, Autovation, V Headrests, CTS Console, STS-V 55w Fogs, Black Vette FRCs, Specter Werkes, Katech LS9 Clutch, SS Brake Lines, Heavymetals U-Turn Fuel Line Eliminator, Momo Combat Evo Shift Knob, Wldwhl Clear Sidemarkers, Linea Corse LC855 Wheels or OEM wheels w/'06-'07 Center Caps, plus a couple more. 472 RWHP/411 RWTQ (Mustang Dyno).

  16. #15
    mlimanti is offline Cadillac Owners Member
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    Re: a/c doesnt work while idle!!!

    I am also curious if you determined what the actual problem was and what it took to fix? I am having the exact same problem now.

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