air vent close when i accelerate on freeway on 1996 Dodge Ram 2500

my air works good but i notice when i am on the freeway and accelerate quickly the vents shut until i let off the gas.

by in Redondo Beach, CA on October 04, 2009
1 answer
ANSWER by on October 05, 2009
This is indicating a vacuum leak in the climate control vent system. The airflow to the vents is controlled by vacuum controlled diaphragms, and if there is a leak, this is the symptom.

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