On a Ford Windstar, what controls vent or defrost function....vacuum or motor or ???
When you select defrost or change to vent or vice versa..... is this controlled by a vacuum line or is it a motor that changes direction of air. And is the selection of heat or AC, controlled by a valve or motor or ??
OK, did my own homework. The airflow is controlled by a door in the air tunnel, directly behind the radio under the dash. I had to change the heater core and found the "pin" holding the door in place and pivots the door, had worked out of the holes. I reseated it, spread the end so it wont come out for a while, and now I have vent or defrost. Dumb design, but a simple fix.
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