2003 Silverado 2500HD A/C problem

[Geeza1]

I have a 2003 Silverao 2500HD with an A/C problem. The A/C works, and is cole, but now only comes out from the top of the dash (like it is on "DEFROST"). I cannot switch the location of where the air comes out. The blower speed is fine.

 

Anyone know what the issue is? Any info would be helpful! Thanks!

[06_GMC]

Do a search on the forums. I think I remember it being a resistor or some issue in that control panel. Hope that helps a little.