Why does the AC blow the air mostly in the floor: on 2001 Buick LeSabre

AC blows cold air, flow is mostly in the floorboard, even thought the control is set on "mid". Very little air comes out the vents.

1 answer 2 comments
It will probably be the mode door actuator causing your problem.
Thank you. Would I need to go to an AC shop or a general mechanic?
General experienced mechanic