Click noise when AC is on?
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Northstar Engines and System Technical Discussion Discussion, Click noise when AC is on? in Cadillac Engine Technical Discussion; My 98 Sedan Deville (109K) makes a loud click noise under the hood every 20-30 seconds only when the AC ...
  1. #1
    kevinK is offline Cadillac Owners Member
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    Question Click noise when AC is on?

    My 98 Sedan Deville (109K) makes a loud click noise under the hood every 20-30 seconds only when the AC is on. It does not occur when ac is off or on Econ mode. It appears coming from the area with all the motors and belts.

    The car runs fine with no major repair except a new alternator and a new battery a year ago.

    Could someone please tell me what is going on?

    Thanks.

    Kevin

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  3. #2
    Lawrence's Avatar
    Lawrence is offline Cadillac Owners Fanatic
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    Re: Click noise when AC is on?

    I would say this normal. It is just the AC compressor cyling on and off.

  4. #3
    El Dobro's Avatar
    El Dobro is offline Cadillac Owners Connoisseur
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    Re: Click noise when AC is on?

    Yea, if there's only one click when the clutch engages on the compressor, that's normal. It's not normal when it sounds like marbles in a blender while the compressor is running.

  5. #4
    kevinK is offline Cadillac Owners Member
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    Re: Click noise when AC is on?

    Thank you very much. I got concerned because I don't have click before and it is pretty loud (a single click every 20-30 seconds).
    Should I still keep the ac on all the time?

  6. #5
    Lawrence's Avatar
    Lawrence is offline Cadillac Owners Fanatic
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    Re: Click noise when AC is on?

    Could be low on freon. But I think when it shuts off from a low freon signal it will trip an error message on you DIC.

    I wouldn't worry much yet. Use it as you noramlly would.

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