The problem I had with my 99 Windstar was the blend door actuator. Did or do you hear a clicking sound when you move the slider from heat to cool?
If so then it could be the actuator. The original parts from the factory were plastic of course and the tiny teeth in the gears sheer off.
I was able to find a replacement at a local salvage yard for about 10 bucks which was much cheaper than a new one.
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Tuesday, December 20th, 2016 AT 6:11 PM