Ck the a/c press. if its ok try a a/c relay
SOURCE: Engine hot ... heater cold ?
Check the coolant level, it could be as easy a fix as adding coolant because it's low. Low level causes engine to overheat, and low level won't circulate to heater core, so no heat situation even though engine is running hot. Let me know if this fixes it, if not I'll help .
SOURCE: Heater only blows hot (well, warm) on full speed of fan
Replace the temp control on this car, it should be electrical control not cables.
SOURCE: 1995 ford windstar overheat after replacing the thermostat
Let your engine warm up with the rad. cap off and see if the coolant level drops. and make sure your overflow is full. It blows cold air because there is no water getting to the heater core. And it shows a normal(ish) temp because the water needs to be touching the temp. sensor. I really do think there is air in the system and there is not enough coolant but hard to tell from here. Also as with overheating any time make sure to check your oil and look for any coolant as the head gasket seldomly holds together if the motor overheats.
SOURCE: 1995 ford windstar overheat after replacing the thermostat
I had the same problem and it was the water pump, loosen the belt and check the pump for excessive play.
SOURCE: AC blowing warm air
When they refilled the refrigerant did they put die in it to check for leaks, it sounds like there may be a leak.
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