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    MRGREENJEANS's Avatar
    MRGREENJEANS Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Nov 1, 2009, 12:55 PM
    Blower comes on intermittently in cool down cycle
    I have a coleman gas furnace manufactured in the mid 70's. The blower seems to malfunction during the cool down cycle. It runs for a while and cooks down the unut, then switches off, then back on for a few minutes (15 min). Then stayes off like normal until the next time the burners come back on. I suspect the fan relay may be going bad, but am not sure if the limit switch would have anything to do with this . Can someone give a novice a little insight please ? How do i check this ? Thank you...
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Nov 1, 2009, 01:15 PM
    Your unit is reacting to residual heat left in the combustion chamber/heat exchanger. This is usually caused by the blower fan control going out of range or a dirty evaporator traping the heat in the unit. There is a wiring diagram on the unit somewhere to help you locate your control.
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
    Ultra Member
    		  
    #3

    Nov 1, 2009, 09:54 PM
    Apply this highly-scientific formula: 35 years (give or take a couple) x number of days per heating season x number of heating cycles per day = 1 worn-out fan control!
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