My air condition wont blow air out the front dashboard vent but will blow out to the floor an defrost why is that what could be the problem

In other words, no matter how you set the vent selector it will not change where the flow of air is coming out? It is very likely that your blend do has lost either a vacuum line that moves it or a busted spring for returning it to its localized position. you will need a philip's head screw driver, a set of 1/4" sockets, and an accommodating ratchet for this job. (if you are doing the work yourself I will help you with the steps. Let me know and I'll post them up.