ANSWERS: 1
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Your temp control panel is actually a computer..it sends info to electric motors that run your duct controls and blower moter. I've seen the motors that operate the duct positions fail. Your computer will actually give you codes if the system is malfunctioning..there also is a way i believe to manual control these thru a default in temp panel..I would try and get some info on this from local g.m. dealer..
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