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    kburns's Avatar
    kburns Posts: 1, Reputation: 1
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    #1

    May 23, 2013, 11:55 AM
    Replacing the Outside AC Unit
    Outside A/C unit makes a really loud humming noise when it runs. What can be done to remedy this?
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #2

    May 23, 2013, 04:38 PM
    Could be loose or broken fan blade, loose or weak contactor, bad fan bearings. Does the blade spin freely? Take the cover off the condensing unit and wiggle the fan. Any motion more than 1/8" or so? Where does the noise emanate from-top, middle or bottom?
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