If I remember right there are metal cables that connect from the air conditioning panel to the doors that change the mode (floor, vent, defrost, temperature ect.) You'll need to inspect these cables, specifically the cable that control the mode door (look for movement when moving the mode know on the air condition control panel). Make sure the cables are attached at both ends and that the door can be seen moving.
Several possibilities here.
The control knob is broken not moving the cable.
The cable is disconnected from the mode door that controls where the air is blowing
The mode door is broken and even though everything is connected and moving nothing is happen to the air flow direction.
Try looking at the cables to see if they're connected and get back to me, TY
Thursday, September 12th, 2013 AT 9:34 PM