Toyota Repair: Toyota a/c not blowing fully, toyota camry, c unit

Question
I have a 93 Toyota camry. I brought it used in 2003 with 160K. It is still driving great. Last summer the a/c began giving me problems and here it is. The a/c only blows air of the 2 side vents on the side by the doors, but only at half the power it used too. And it doesn't blow any air out of the 2 vents in the middle of the dash. any clues?

Answer
The problem is with the vent control on the dash, it's connected to the air duct housing under the dash by a cable, the cable may have come off at either the control knob or at the control lever on the a/c unit.
Check under the das on both the left and right sides and move the vent control knob and see if it operates the lever and that it is adjusted so that it fully opens and closes the air blend door.