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How do you stop a '92 Plymouth van from going to defrost when the air vents are on during acceleration?

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July 15, 2015 7:46PM

U have a Vaccum leak @ your resivoir for all your ac & heating controls.Sometimes a cracked Vaccume line from the Engine Intake Manifold 2 the AC Canister will do the same.Some cars have a container that looks like a fruit juice can mounted under the hood Ford/Chevy/dodge etc ALL will do the samething because of a VACCUME leak.