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Most vent systems are vacuum controlled. Could be a vacuum lines has come loose or the door that is controlled by switch is physically restricted. Vent door could be cable driven as well/broken, bent, cable. Both would require a little digging behind the dash. Try to pop the vent controls out and make sure everything is plugged in or moving as it should. Put the seat all the way back if you have to dive under.
most likely you'll have to replace the plastic tab on the back of your controls its easy to do. You'll have to take out the radio and temp. Control unit you'll see where the cable hooks in its probably broke. For a temporary fix you can unhook the cable at the floor. Its on the drivers side by the gas pedal.
i had the same problem with my 02 altima..behind the temp knob was broken and the cable to open and close the heat vent ..was no longer connected...to check turn knob from red to blue a few times and listen for vent door movement...also u can look on left side of console to see if cable is moving.