Hi:
Chances are, you have a faulty blend air door actuator. If this vehicle has dual climate control, it sounds like the driver's is working and the other, passenger side, isn't.
Here is a link that explains how, in general, one is replaced. Take a look through it to gain a basic understanding of the replacement.
https://www.2carpros.com/articles/replace-blend-door-motor
If you look below, I attached the directions from the manual for replacement. Note there are several variables as far as design. I have provided the directions for the passenger side blend door with manual climate control. If you have something different, let us know.
Take care and let us know if this helps.
Joe
See pics below. The last pic provides recalibration methods.
Images (Click to make bigger)
Monday, February 2nd, 2026 AT 8:30 PM