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most of the time this problem is caused by a vacume leak. You might have a vacume leak or a vacume hose boken. this is more than likely under your dash in the ac system switch. but it could be under the hood. look by the blower motor on the right side next to the fire wall. there is a hose from the engine to that area. that is a good place to start.

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โˆ™ 2005-12-05 03:12:33
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Q: How do fix a 1997 F150 flap or door under the dash that swtiches to heat you can not get heat you changed the hot cold switch that did not fix the problem?
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