Ac Problem

[screamin02c5]

I recently bought my first C5 Vette. I was hoping someone could point me in the right direction with some help with the AC. The car is an 02 with the dual zone digital controls. It will not switch from BiLevel (dash vents and floor ). The blower works fine at all speeds, but it wont switch between the different vents. It shows in the CarFax that the ac controls were replaced already. With temps around 105 here in central TX, Im burning up driving around because half of the air is coming out of the floor vents! BTW, ac blows plenty cold out of both sides. Any help is appreciated!

[derekbuckner1]

Better start looking for a vacuum leak