Air not blowing out dash vents

SOURCE: Dashboard AC Vents don't work

check the vent housing under dash it is vacuum controled most likley you got a line off or broken not allowing door inside to open worse case scenerio the acuator on it has gone out and needs replaced hope this helps

SOURCE: there is no air blowing out the vents on the dash board when i turn the ac on

you have a bad control unit, the thing you use to switch from one thing to the other, it needs to be replaced.

SOURCE: Air won't blow through dash vents under acceleration

there should be a vacuum line running by the drivrs side shock tower that might be unhook are cracked

SOURCE: The Air flows through only the defrost and feet vents

Inside the ventilation system there is gates that open and close to direct the air flow. These are operated on vacuum on most vehicles. The hose for that perticular gate may have disconnected somehow or has a hole in it. I suggest you take the heater controls out and see if there is a plug with a series of colored hoses on it. it so you'll have to trace each of them to see which one is the problem. Now you may be able to get some help from you local dealers mechanic who just may know the color code for that gate. (which would be a bonus) Good Luck

SOURCE: air blowing out defroster vents and floor vents

Check your vacuum lines; you probably have a vacuum leak that is preventing the flaps from closing and opening upon "command."