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well a lot of times you don't lose it it just blows out the floor, and in the winter the heat will come out defroster vents on hills, if this is your problem there is a check valve in the vacuum line that works the vent door actuators, when under load the engine does not produce vaccum to this line so the check valve holds vacuum in the system. it should be near the intake manifold on the pass side of engine, it should only let air through it in one direction sometimes this is the problem, you could also check for a broken vacuum line and in one instance the cruise module in one of our vans was bad and leaking vaccum and created the symptom, i used to find the check valves in the "help" section at the auto parts store

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Q: Why do you lose your ac when you accelerate in your 1997 dodge ram van 2500?
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