The air flow direction is controlled by the mode door actuator. If you can't get the air flow to come from the vents, there is a chance the actuator itself is bad.
I attached the directions for replacing the actuator below. However, what I suggest is to inspect the actuator first. Make sure it's tight. Once removed, see if it responds when you select vent.
Try this and let me know the results. Also, let me know if you have questions, let me know.
See pics below.
Images (Click to make bigger)
Wednesday, May 11th, 2022 AT 8:56 PM