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    diyhrh64's Avatar
    diyhrh64 Posts: 1, Reputation: 1
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    #1

    May 30, 2013, 12:33 PM
    Replaced a cold air return grid, now furnace makes a squealing sound
    I replaced a cold air grill cover and now the furnace makes a squealing sound every time it kicks on, whether for heat or air conditioning. I remove the grill cover and the sound stops?
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
    Uber Member
    		  
    #2

    May 30, 2013, 02:13 PM
    Squeal or whistle? Is this a straight return cover or over a filter? Somehow you are apparently getting a harmonic resonance. Try bending the grill vanes a bit to change the air flow pattern.
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