The servo motors, should be your problem. The arms are too fragile.
First you must know if the cold air is not coming out from all the exits.
Only for the driver and the passenger at his side. Or for the all passengers included at the back seat.
At left side of the driver you have have the controllers to switch the destinations and the directions of the AC.
If you change and didn't find any solution.
You should check the servers.
You should remove the panels under the driver position, as you can see is this videos
https://www.youtube.com/watch?v=Wl6McBWXekM
https://www.youtube.com/watch?v=yzF0FtayfKg
And here is the unit outside of the car
https://www.youtube.com/watch?v=kegr2onvtz0&t=372s