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I found this on another site & hope it helps.

Arthur in Texas

"If the vacuum system functions normally at idle but goes to defrost during acceleration, a small leak exists in the system. The leak can be located by turning off the engine and using a hand vacuum pump/gauge to check for vacuum delay while selectively blocking off vacuum hoses. I would start with the vacuum tank and check valve under the hood. This is the most likely location of a leak".

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โˆ™ 2007-08-13 12:48:48
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Q: Where is the air conditioner vacuum line on a 2003 Ford Supercrew When you accelerate the AC comes out of the defrost vent and when you let off the gas it comes out of the dashboard vent?
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