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The selector for heater, vent, defroster, or other settings, simply changes where the air blows out. There is a valve (kind of a way to think about it) in the dash that either closes, or opens, and routes the air to where it should be going according to the selector knob. This valve, or switch of sorts, will get stuck in any particular position sometimes on a variety of GM cars. Usually, the first symptom is that you start to lose fan speeds. Like you may have fan speeds 3,4,&5; but 1 & 2 don't work. Then you either lose other fan speeds, or then lose the defrost, or the ability to get air to your windshield. I believe I have heard of it locking while being completely open before, so that could be what's happening with you. It does have to be taken to professionals, but it doesn't cost much to have it fixed. $50-$130????
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