Vent controls not working
 

The knob you turn for the vents (defroster, floor, etc.) isn't working anymore. I can still turn it but no matter what I put it on, it still only blows air out of the dash vents. Are these electrical or with a hose. Anyone else had the same problem or know what it might be. I would rather wait for answers then rip the dash apart and then possibly find the problem.
Thanks everyone.

I cant help you, but mine about a month ago went from normal to everythig being opposite. If I put it on defrost air comes out the vents and if I put it on vents I get air flow through the defrost. It happened after my battery went dead for a couple hours.WTF