i have a 96 camaro and the air will only blow from the floor vents, i tried switching back and forth between face,defrost, and theres no switch, just floor, can anyone help

 

Usually, it means there is a problem with the vacuum system that operates all the flapper doors that control where the air goes. The usual culprit is the vacuum check valve, which breaks pieces off.

Shoebox has all the required info:

http://shbox.com/1/vac_check_valve.jpg

http://shbox.com/1/hvac_vacuum.jpg

 

I think I had this issue happen with mine once, and if I'm not mistaken, the part took maybe 5 minutes to replace, and didn't cost much, either.