I have a 98 ford windstar..heat doesnt work...will only blow cold air, but engine temp. stays normal, when i turn on heat it only blows at window vent..what can this be?

Check the voltage coming to blower resistor with ohmmeter for continuity!

I would probably start by replacing the upper hose. The temperature guage and heat will be affected by poor circulation of coolant.

jtg

try changing the thermostat for starters.

the blendor actuators strip out the gear inside the actuator cases on these all the time. replace the actuator.

If you have the heater directed to the windshield, the AC will turn on. Move the control away from defrost.

i would check to see if the stat is working right, do you have rear heat on this vech? . if you do you may have a air pocket, the windstars have a metal tube coning from the water pump that gose to the heater core lines for the rear heat and they like to fail. they get a pin hole leak that hard to find, the water pump also likes to fail also, not moving a enough fluid under load the ends of the inmpler wear down

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.

I had the same problem and it was the water pump, loosen the belt and check the pump for excessive play.

did you forget to hook up any vacuum lines