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

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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.
(1) Answer
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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