You're jus going to have to take the unit apart and find what is binding up the cable or blend door. Maybe something in the blend door path, a toy or something that ha fallen in the ducts.
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: HVAC vent selector does not function. Air flow is
THe blend door seems to be stuck. When you change settings from defrost to floor air or, vent, the blend door opens and closes directing the air to the place you want it to go to. I have had some success spraying a lubricating oil such as WD40 under the dash on the blend door. You need to get under the dash with a flashlight to locate it. It looks like a flap. Spray it with a couple of shots of the WD40. Go easy on the spraying as you may be inhaling the fumes. Keep the doors and windows open to minimize the fumes. Wait about 1/2 hour and try the A/C functions. (defrost, floor, vent air)
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: 98 xplorer cold a/c but when you start moving you feel it start changing to hot air
I had the same problem with my 98 ranger. the problem is the hot cold air blender door. on my truck the the top of the door where the electric actuater is placed broke and no matter what you selected on the controlls you would get hot air. to verify that it is not the A/C place it in the Max A?C position. this will cut off hot coolant to the heater core and you should after a few minutes get cold air. if that works you can find the actuator locaed behond the glove box door on top of theplastic duct next to the blower motor. the only way to fix the problem would be to replace the unit or do what I did I glued the actuater spindle to the blender door. make sure the actuater is in the same position as the door or it wont work.
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