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The AC / Heater unit has doors that open and close inside the dashboard. One of the doors is stuck open or closed. Some cars this is done with cables when you pull the lever from hot to cold and others with vacuum lines when you push the buttons and have no lever to pull. Check a pull cables and vacuum lines. May have to take apart dash broad and see the door stuck open or closed. Then why does it not close could be a simple vacuum line to a broken door or plastic part.

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13y ago

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