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2000 dakota. My heater and blower work. My air direction door works. But for some reason its slightly blowing outside air through ALL vents when fan is on! On any direction setting.
Couple of things to check. The vacuum actuators may not be moving all the way. The other, the foam in the HVAC housing that seals the doors has failed.
98DakAz has some pics in the forum if you do a search.