air ducts

pull blower and check for a broken off cage

I can't remember if your car has vacuum vent control,if it does and has a leak in the line somewhere,usually under the hood,there is usually only only one line going into the car interior,this controls where the air is directed,from the control panel,I dont remember your car having electric stepper motor control for the vents,listen for a vacuum leak with engine running,definately check the vacuum lines,if not under hood,most of the others are on passenger side,remove the panel and listen there too,also at the control head,it can fail too.