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Why is vent not switching from heater to defroster to bi level on Buick skylark?
Wiki User
∙ 12y ago
It depends on the year of the Buick. Most of the newer Buicks use an electric actuator to change the vent door positions. If that's the case with yours you have a problem with wiring or a faulty actuator or switch.
If yours is one of the vacuum controled heater boxes you probably have a leaky vacuum line or diaphragm.
Wiki User
∙ 12y ago
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