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A/c compressor Outside unit rattles like a pea thrasher occasionally, then will quit after a couple of minutes. Noise is a loud clicking. What's wrong? Tom Slough

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  • tomslough Sep 14, 2008

    It's definitely in the compressor. If gas low oor dryer clogged, would compressor sometimes make this loud clicking noise?

  • tomslough Sep 14, 2008

    Still cooling

  • FatGeek Dec 22, 2008

    Outside A/C unit makes a very loud clicking sound every 1.5 to 2 seconds, and with each click the unit shakes side to side and vibrates briefly.  The noise sounds like clicking from inside the house, but is a very loud Donk noise when standing near the unit outside.  Bought the house this spring, had no problems cooling the house,but the heat wouldn't shut off when it came up to temp.  The clicking noise started after we had been manually turning the unit on and off for a few weeks once the temperature dropped.  The t-stat installed by the seller was a 6 wire, needed a 9 wire, t-stat has been replaced with a honeywell programmable unit that seems to be working fine, heats properly, shuts off properly, but occasionally it will click for several minutes until the t-stat shuts it off and it is able to stay off for a while.


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Observe where the noise could be coming from, it could be from the fan or from the compressor.

it could also be just a loose metal vibrating.

if it is still cooling, then it could definitely be just a loose metal housing or bracket.

hold onto it and feel if the noise would disappear.

tighten all loose screws and bolts. replace the screws if necessary.

tnx 4 using fixya,


Posted on Sep 14, 2008

  • francis rivero Sep 14, 2008

    no it would not make such loud clicking noise.

    if it is low on gas and/or clogged dryer, it should run as smooth as before and even more silent because of the less load it is experiencing.

    as i have asked before, is it still cooling?

    please let me know.



  • francis rivero Sep 15, 2008

    ift he noise is coming from the compressor and it is still cooling then there could be a spring inside the compresor broke. it happen sometimes.

    the soulution would be to remove the compressor, cut it in half by sawing the housing, then you can see the broken spring in there and rplace it. i am not sure if you can find the part. they may not be selling the pring only. you can only get that from an identical compressor which only service shop would probably have a used and junked one.

    then after you have replaced the spring, you can weld back the housing airtight.

    the welder should really be good to seal it good.

    or you can just ignore the noise and live with it and if it i no longer cooling, then that is the time to replace the compressor.

    tnx again



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