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  1. #1

    Default Clicking/Ratcheting Noise under hood from A/C

    I purchased an 02 Suburban with 44K this past winter. I don't drive it much, but here lately I had drove it a little and the A/C worked great. Last week it quit blowing cold. At the point of noticing that it was not cooling I had heard a quick 2 second ratcheting/clicking sound up front I believe under hood. The noise was on a second or 2 and maybe 2 to 3 times and then I turned air off when noticing it wasn't working. I took it into a friend and he found that the Belt for the A/C had broke and put a new on one. It has worked great the 2 times I drove it, but at lower speeds or RPM's just starting off it has started making the noise even loader now. Any ideas? Thanks.

  2. #2


    Hi there, I'll give you my 2cents on this. The AC belt tensioner is a possibility and a fairly common repair as well. Also, did you change the main drive belt? My Burb would squeal at low and take off speeds and the main belt had some cracking on the ribs (minor) and some glazing on the top side. When I replaced both belts the noise went away completely.

  3. #3


    if the ratcheting/clicking noise is click (pause) clack (click is higher pitch than clack) it is likely the AC clutch mechanism. most A/C's have a pressure switch that causes the clutch to engage/disengage and if the pressure is low (like at low rpms) it will engage / disengage more often.

    have the systems pressure checked, you may be low on refrigerant.

  4. #4
    murdog94's Avatar
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    I would take a look at both of the above recommendations because they are both very viable possibilities.


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