Vents not working?

Today my vents won't work it will blow out of the defrost but i can't change it to vent. It worked the other day and now it doesn't. Would it be the switch? and how expensive would they be. thanks

I have the controls that are manual as far as switching it from hot to cold. Could i swap in the digital display version for this car? Would it hook up with out any modifications and would it fit in the same space? thanks

No, the digital displays are for cars equipped with electronically controlled climate controls.

Problem fixed! A vaccum line came off. Don't know how that happened i must have accidently bumped it. Hooked it back up and it imediately worked again.