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What would be wrong if the defrost works but the vents don't in a 1991 Buick Regal?
Wiki User
∙ 17y ago
You probably have a vacuum leak and aren't getting vacuum to the actuators. With the engine running, listen for vacuum leaks under the dash. If you don't have any leaks there, check under the hood to make sure the vacuum line THERE isn't disconnected.
Wiki User
∙ 17y ago
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