Heating & A/C Vent contol
 

I just bot a 1990 Camry, had it detailed, and then discovered that the heating and a/c vent control is not changing the air direction. Regardless of where I put the control knob on the slide, the air only comes out of the dash. It will not got to the floor or to the window (defrost). I am sure it was working prior to the detail job and thus I suspect a little vacuum cap or something got disconnected or knocked off. Does anybody have some advice on an possible "easy" fix on this ?