cool air comes out of the defrost and also the floor vent.
Air conditioner will not shoot air out of vents. on 1997 Ford Taurus
It sounds like your vent door under the dash is not operating rite. Tur the knob and listen by your dash to see if hear the door moving when you change the setting. If u dont hear anything moving behind there the vent door may be jammed or your control switch is not good. Do that and let me know your results.
my taurus was doing the same thing to,it was the little vaccum hose next a/c where u put the freon,mine had come off.