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There should be a temp. probe mounted on the hot air plenum. This is what turns the fan on automaticly when it reaches the preset temp. Mine has an auto/manual setting on it. Check that it's set on auto. If you take the cover off you should find it has two adjustments one for
on temp. and one for off temp. I think this is where your problem is. When the furnace kicks on and runs for a while the air heats the probe and when it reaches the preset temp. it turns the fan on. The fan should continue to run after the furnace has shut off untill the probe cools down to the cut out temp.
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Pete
79 911SC RoW
"Tornadoes come out of frikkin nowhere. One minute everything is all sunshine and puppies the next thing you know you've got flying cows".- Stomachmonkey
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