I have a 1997 s10 pick up and my ac/heat only blows through the defrost and floor vent... and I don't know what might be the problem.. can anyone feed me some advice on what to do.. I am also a college student living in Florida and I do need my AC to be blow in the mid deck vent....

 

Im pretty sure there is an electronic flap that controls that when you rotate the switch, and that could have gone bad so you might want to check that. Im not exactly sure where its located but i know there is one.