Re: my 1997 ford f150 heater blows cold air in winter and...
First check and see if it has a thermstat installed or stuck open, second, make sure that your heater has not been bypassed by connecting the two hoses together
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Make sure the cooling system is not plugged up, poor coolant flow can make your engine run hot, and a plugged heater core will not allow heat in the cabin in the winter.
It sounds like the system is fried. Based on the description, it is just pulling in the outside air and not doing anything to heat or cool the flow. Unfortunately, this is a job for your preferred mechanic.
hi Planeman. Why is the heater in my car not working?
Ken Mattson, owner of Len's Automotive in Bellevue, Wash., says a car heater can stop working for a number of reasons, including: A low antifreeze/water level in the radiator due to a leak in the cooling system. A bad thermostat that isn't allowing the engine to properly warm up.11 Dec 2013
Make sure that the tubing around the accumulator is getting cold.
If not, the refrigerant may not be charged up.
Otherwise, the vacuum motor for selecting cold air may be not working correctly causing heated air from the heater core to be routed to the interior of the car.
Do you hear the vacuum motors working when adjusting the heat to cold selector? or changing the thermostat temperature if so equipped?
your problem is caused by the air temperature control blend door actuator motor being defective, the little motor moves the door that gives either hot air or cold air or a blend of the 2.
guys have you checked for a vaccum leak????? there is a little plastic ball with a vaccum line going to it that controls the outside air coming in. check for a leak in this line
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