2002 Ford Taurus SE. Heater motor and fan work fine on all speed settings but the air coming from the vents is moderately warm at best and not hot when temp selection is to hot. When I move the temp setting to cold all the air is cold. Mechanic replaced thermostat this week but air is lukewarm at best. Took back to him today and his on-line research says it is a blend-door problem. Outside temps here this past week were below zero, car sits outside and if I warm up before going to work it would take more than an hour to defrost the windows. Both hoses to the heater core are warm. HELP

Stephen Pearson

• 49 Answers
• Posted on Dec 03, 2008

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: Problem:

Problem is most likely in the electronic blend door motor or the door itself has broken.
To access the electronic temperature blend door actuator remove cassette storage box or center shelf unit, if equipped.
Remove instrument panel ash receptacle by depressing service lever. Disconnect electrical harness connector from A/C electronic door actuator motor.
Remove three retaining screws.
Carefully pull A/C electronic door actuator motor outward and off A/C evaporator housing assembly.Make sure the door it self is not cracked where the actuator hooks to it and that it will move.
Here ia a link to a pick of what you are looking at.

http://i253.photobucket.com/albums/hh43/chuck943/L9819A.gif

SOURCE: Ford Windstar SE, 3.8L V6, 1999, front seat heat/defrost is cold

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

SOURCE: '02 Escape, heater cold when outside air below freezing

This could be a few different problems. I would recommend taking it in and having the antifreeze checked to see if it is of a sufficient mix to keep it from freezing. Sometimes the antifreeze will be to thin to keep it from freezing and it will start to freeze in the heater core. If this is the case, the vehicle may not run long enough to thaw out the antifreeze in the heater core to generate heat. Another possibility is that the thermostat is stuck in an open or partially open position not allowing the engine to reach a high enough temperature to generate heat through the heater core. The last possibility is that there is a blockage in the heater core not allowing the hot antifreeze to pass through the heater core thereby reducing the amount of heat drawn off of the heater core. These are but a few of the more simple problems but any of them should be treated by a licensed mechanic.

Testimonial: "helpful.tested all suggested solutions but did not change thermostat. coolant level and protection is good, heater core,upper and lower rad hoses hot"

SOURCE: i have a 1998 ford f-150 and no heat. i have

You just might have an air lock. Try bleeding the system from the heater hose at the firewall. Losen one hose a little, and at operating temp. open slightly to let air out. You will lose some coolant, but just refill the rad. Now, both hoses should get hot.