Other than defrost none of the other panel air vents work on your 2001 windstar what is the cause of this?
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What is the cause of ac being mixed to defrost and dash vent plus auto temp control readout is dim?
It sounds like you have two separate problems. Incorrect routing of ventilation is usually caused by bad vacuum motors or loose vacuum lines, but remember that A/C is -supposed to be- routed to the defrost vents when controls are in the Defrost position. The dim temp control readout could be due to a number of causes, but probably isn't related to the other issue you describe.