heater control on heat.I have no air coming out of floor vents. on 2004 Buick LeSabre

all the air comes out of the dash vents.could this be a control switch or a actuator??

3 answers
Yes exactly
Check and/or replace the mode door actuator.
have it ck'd b4 repl anything it could be several items but a proper diag will help in the long run and save you money