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Revving noise in central air unit

Hi, my central air is cooling well, however it is now making an on and off revving noise that causes it to vibrate. It never did this before. Is th.is a motor issue? What do you think is causing this? It's an old unit that I am trying to keep alive

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Are you sure the revving sound isnt a loose grill around the condenser or something setting up an on-off revvind sound-vibration by the speed of the unit,go out to unit and push and prod on exterior of unit and look down inside to see if anything could be loose

Posted on Sep 23, 2009

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