My Air Conditioning and heater will only blow up on the wind sheild no matter what setting I have it on. Does anyone know what might cause it to only blow defrost?
1999 Mercury Cougar Please Help
Apr 10, 2006
1 Replies
Flapper doors divert the air flow to various outlets. Some flapper doors are moved by electric motors, however MOST flapper doors have a vacuum actuator controlled by either a manual lever/knob/switch or by a computer module. So, its one of these: stuck door bad actuator no vacuum bad control unit
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