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Why does 2000 Buick Lesabre Custom Air Conditioner blow only through defrost vents?
Updated: 10/22/2022
Wiki User
∙ 6y agoBest Answer
The vacuum supply line from the engine is disconnected or broken. When the vacuum supply is cut off the system defaults to the defrost mode.
Wiki User
∙ 6y agoThis answer is:
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