The internal controls knob does not change the air flow from the console vents or to floor heater. It is permanently routing the air through the defroster. I suspect there may be a problem with a vacuum line or such, if that is what controls the little baffles in the dash that routes the air this way or that. My Hayes repair manual that I'd picked up at the local Napa or Parts Plus store doesn't have a section for troubleshooting or examining this system. I really don't want to rip out the dash when the lines are located under the hood, or vise versa.
Yes vachum controls all the doors on it go to http://www.alldatadiy.com and buy a subscrption there for your car they will have all the parts location for you there, most likely the blend door vac. motor is bad.
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CHECK AND REPAIR THE VACUUM TO THE AC CONTROL SWITCH FOR FUNCTION CHANGE.
New answer to old post but relevant. The vent door in those get hot and melt into place and there is a white plastic control left center under dash that one must move by hand into the defrost position since defrost is more important than other vents. The cables also break the plastic where they attach. The repair is to remove the entire center dash where it all is located behind. All of it. You can then see the extent what is wrong and needs repaired. Leaving it in 'defrost' is easier and cheaper than what you will spend on that cheap car replacing the venting system. Good mileage is now lost to costly repair by another motor company that makes disposable cars equal to Bic lighters!https://www.focusfanatics.com/forum/gene...
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