It wont switch over when I turn the knob to put it towards my feet or even windshield defrost it doesn't come out from there....only straight at my face. The knob turns but the air only comes out the one way.
TSB 03-01-38-005d, is to replace the foam in the mode door valve.
foam comes loose and prevent the mode door from moving.
The whole dash must be removed to installed the new foam.
Part number gm
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your blend door motor IS your defroster problem , as it is needed to direct heat mixed with the ac to properly defrost the windshield . if when you change your blend door motor and the problem still exsist , then youy have a defective blend door package , meaning one of the doors are faulty , which could get very expensive to repair , good luck !!!
this could be a simple switch problem, if it is a rotary switch, pull the front of it off and try turning the little knob with pliers, the cheap plastic used now sometimes rounds off if this isnt problem depending on type of switch electrical connections on switch could be bad or vaccum could be plugged or non existant
YOU SEEM TO HAVE A LOOSE OR BAD AC COMPRESSOR DRIVE BELT. WHEN YOU SWITCH THE TO THE VENTS CLOSE TO THE WINDSHIELD IT TURN THE AC COMPRESSOR CLUTCH ON, IT ACTIVATES THE DEFROST. TRY POURING SOME WATER ON THE AC BELT AND SEE IF NOISE GOES AWAY. THE BELT MAY NEED ADJUSTMENT OR MAY NEED TO BE REPLACED. GOOD LUCK
are you referring to the windshield defroster? if so, then it is normal for the ac compressor to cycle on and off, the reason being that, during winter months, is helpful for the proper function of the ac compressor to cycle on and off so as to not lock up.