I'm not sure I'm in the right forum but here it goes . I have a 2007 Chev express 1500 & my air flow selector switch in any position only has air coming out at my feet once in a while if I move it it changes but seems to get stuck on the lower setting if I switch it to feet & no matter what position it is turned to doesn't change the air flow any suggestions

Welcome to the forum. The correct section would be Chevrolet but that'* alright since you're new, a Moderator will move it for you shortly.

Check for a vaccum leak.

If you have vaccum then could be a binding door or bad control assembly

By the way welcome to the forum Im sure you will find what you are looking for here. This is an awesiome site