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    meme53's Avatar
    meme53 Posts: 4, Reputation: 1
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    #1

    Dec 13, 2012, 04:48 PM
    1993 Goodman heating unit
    I have a 1993 goodman heating unit that makes a noise before the fan comes on. It almost sounds like a bumping noise. Is that the metal expanding? I was told that what sound was by a technician.
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #2

    Dec 13, 2012, 05:56 PM
    Depending on how your ductwork is made it could be expansion. If you only hear it on heat, probably is. Metal plenum?
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