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I have a 1970's coleman forced air heater and after it is thru heating and shuts off, the blower keeps cycling on and off for a bit afterwards. is this normal? i also noticed that there appears to be some missing wires form the low volt term box. could this be the problem?

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Your furnace will either have a fan switch that is adjustable or it has a timer. Look for a small box approx 3" x 5" in the upper area of the furnace just below the plenum. If you pop off the cover you should see a round disk with 3 little tabs in a slot on the disk. These taps should be set at 100, 140 and 200. If it is not there you have a timer on the circuit board and there is no adjustment. If it is not bothering you, don't worry about it. Good luck.

Posted on Dec 11, 2009

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