Question about 1999 Ford F150 Regular Cab
Check the hoses to the heater core and make sure they aren't deteriorated. Also, it might be worthwhile to clean and flush the cooling system.
It's possible there is a problem in the controls for the air conditioning system, too. The various valves in the ducts are vacuum controlled, and if a leak develops, it's possible that cold air is being mixed with the heated air.
Posted on Dec 03, 2010
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Posted on Jan 02, 2017
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