when turn the control to floor very little comes out,
the control knobs on the dakota,s and all the dodges was bad to strip out and cause that to happen,go to a salvage yard and get another one for it,chances are its just not going far enough to open the vent door to allow the air to come out where it should be coming out,i own an 03 and have had to replace mine once already,try this pull the knob off and look to see if it is stripped out or not then you,ll know if its that part of it,you may wind up replacing the inside control unit also,good luck
ifthe air is good on defrost and vent but not on floor then you have a vacuum line off inside your dash...that is how it switches over....pull the unit and check the cables and lines....it is also possible that your switch is stripped and moving too far or not far enough.....when you hit the floor position, it reads floor but isnt all the way there.,....just a few adjustments should do it...