A/c Not Working Right 78 Deville
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500, 472, 425, 368 Discussion, A/c Not Working Right 78 Deville in Cadillac Engine Technical Discussion; hello everyone Ive got a a/c problem in my 78 deville, what happens is when you are driving the car ...
  1. #1
    tripleyellow78cad's Avatar
    tripleyellow78cad is offline Cadillac Owners Fanatic
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    Question A/c Not Working Right 78 Deville

    hello everyone
    Ive got a a/c problem in my 78 deville,
    what happens is when you are driving the car with the a/c on
    it will run ice cold and then will get warm and uncomfortable ,
    I don't think its low of freon,(no visable leaks,newer a/c delco compressor A/6)
    plus when it works it will freeze you tail off!!!

    So if any one out there know what the problem could be please reply to this thread
    thanks , tripleyellow78cad

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  3. #2
    MMNineInchNails's Avatar
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    Re: A/c Not Working Right 78 Deville

    It's a vacumm leak somewhere probably behind the dash somewhere. My Z does that too. It'll run ice cold until you give it a certain amount of throttle then it gets warm.

  4. #3
    tripleyellow78cad's Avatar
    tripleyellow78cad is offline Cadillac Owners Fanatic
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    Question Re: A/c Not Working Right 78 Deville

    Quote Originally Posted by MMNineInchNails
    It's a vacumm leak somewhere probably behind the dash somewhere. My Z does that too. It'll run ice cold until you give it a certain amount of throttle then it gets warm.
    that was my thought too,
    i was thinking of adding an inline check valve but i can't find the vacume line/hose that goes in to the climate control , any idea where i can locate it?
    and if a check valve wont work what about adding an eletric vacume pump?
    thanks for you reply

  5. #4
    tripleyellow78cad's Avatar
    tripleyellow78cad is offline Cadillac Owners Fanatic
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    Question Re: A/c Not Working Right 78 Deville

    well i un pluged a set of wires on my programmer (behind the glove box)
    and the a/c blows cold all the time and never warms up, hope i wont damage anything,
    now when you move the climate control to 85 it stays on a/c
    well if i break it at least i had cold a/c for a while

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