Hi guys. I have a 2008 chevy Impala LT with the 3.9L engine. This morning I woke up to a foggy morning. Used my remote to start the car early so the Windows would be clear when I got in it. As I was walking to the car I noticed the Windows were not clear. After investigating for a minute , playing with the selector switch , that the only thing not working was the front defroster? It blows out of the vents and at my feet. When the switch selector is in the defrost position it blows at my feet? Any help would be greatly appreciated. Thank you.