Cold air is only coming out of the floor vents and defrost vent on all settings. on 2001 Saturn SL

The last time I drove the car, I switched from dash air vents to defrost, now no air will blow from dash vents, but cold air will come out of the floor vents on all settings.

Asked by for the 2001 Saturn SL
Sounds like a blend door is not working correct. Need to get under dash to find out.