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Heater/AC Airflow Control

(1999 Ford Explorer)
in Renner, SD on August 26, 2010
I have a 1999 Explorer Eddie Bauer. With the A/C on auto and airflow out of the dash vents, airflow will slowly move to the defroster whenever I have to accelerate. Once back in normal cruise, the airflow returns to the dash vents. Does the same thing with heat out of the floor vent. Could this be a vaccum leak at the control valve?
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Popular Answer
on August 27, 2010
have replaced alot of one way check valves for this concern.
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