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Because U have a Vaccume leak-either a bad Vaccume hose going 2 the Vaccume Canister or the Canister.Sometimes they have small hard plastic hoses that crack or get brittle from Heat-IT only takes a very small leak 2 cause your problem,Even the Actuator inside the car could b bad or a hose off under the dash.

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โˆ™ 2004-08-30 23:27:13
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Q: Why do the front dash AC vents on a 1997 Lesabre close when climbing a hill?
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