Hi,
What you described sounds like an issue with the mode door actuator. The mode door is what directs airflow to different places. If you are getting airflow from a different location such as the defroster or floor but can't get it from the dash vents, this is my first suspect.
What I would recommend is to remove the actuator and confirm it is working or actuating when you select a different airflow direction.
If you look at the pics below, they are the directions and pics which correlate with the replacement of the actuator. Use these directions to remove and inspect. If it is bad, replace it.
I hope this helps. Let me know if you have other questions.
Joe
See pics/directions below.
Images (Click to make bigger)
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Friday, March 19th, 2021 AT 8:28 PM