Question about 1992 Cadillac DeVille

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When i switch my heat or air from defrost to aut or vis versa the air only comes out defrost vents what wrong?

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The vent doors in and under the dash are conrolled by vacuum lines. Checkthese plastic doors to see if they opperate smoothly and the vacuum hoses are hooked up right. See where the vac lines come from and make sure they r hooked up. Also make sure the vent direction switch is hooked up to the vac lines. Good luck

Posted on Oct 10, 2010

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