Hey guys....I'm new to the forums here. I have a friend who has a 2003 Silverado with the manual climate controls. The problem he is having is that if the control is set on the "foot" or "defrost" positions, occassionally the air with blow out of the front, top vents (the ones that blow in your face) and when he messes with the controls they won't switch immediately, it is completely random and will even switch itself while driving.

Has anyone had this issue before? Any help would be appreciated