You have a vacuum leak.Defrost is the default postion(no vacuum).
See if you can locate the small black vacuum line that goes inside the vehicle on the passenger side near the heater core. The trace it back,should see it going to a canister then to the intake manifold.Make sure it is not disconnected or broken somewhere.
My 2003 windstar had the same problem. It was the vacuum cannister. That part# is F2UZ19A566A and the Ford dealer charged me $32.11 for it. Works fine now. My heat was also not working and the problem was the actuator motor.The part# for that is XF2Z19E616FB and the cost was $55.31 plus tax. Now the heat works.
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a/c air does not blow at dash vents
door vent heater not opening on my 1989 ford f150 and blows heat through defrost only. what is the cause?
my explorer idles crazy and switches from my vent to the defrost only on my a/c not my heater.
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