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Low vacuum. When you push down on the accelerator, vacuum decreases. Your Blower doors use vacuum to change positions from floor to vent to defrost. Have a vacuum test done on the vehicle. You may have a vacuum leak, or this may be a sign the engine is getting weak.(Low compression, Leaking valves, etc.)

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โˆ™ 2005-09-28 02:23:14
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Q: What causes for the ac air to change from the front vents to the dash defroster vent when you accelerate on a 1993 Ford van?
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