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Have someone turn the mode **** and someone else look at the actuators and see if they move. Or apply vacuum at the actuators. You could have a broken bleed door or actuator.
i had a similar problem with the defroster not working, i had the "gauge ****" cluster for the controls replaced. it worked for awhile. im not sure where the vaccum lines are. it doesnt show them in my haynes manual. i guess i'll take it to the garage. thanks for your help.