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What is wrong with the heater controls on a 91 Buick Regal when the heater controls wont switch to defrost vent etc even when the lights on the buttons iluminate?
Wiki User
∙ 2006-04-12 14:55:06
Many of these controls are Vacuum operated. You may have a problem where the "Main" Vacuum line has broken. See if you can locate this line by using your manual and make sure that it is intact. TommyTrouble
Wiki User
∙ 2006-04-12 14:55:06
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Don't know what vehicle you have but most HVAC controls operate from a vacuum supply from the engine. I would start with checking the vacuum supply connections under the hood. They could be cracked or disconnected.
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