Hello and welcome back.
This is a common failure of the driver side temperture door actuator motor.
You can try to reset the system by doing this procedure...
Turn key off.
Remove the HVAC/ECAS fuse from the underhood fuse box for 1 minute.
Start truck and do not touch any HVAC controls for 2 miinutes.
Turn off truck for 10 seconds.
Start truck and check operation.
This will sometimes re-set the motor. But it it may start acting up again.
The motor would need to be replaced.
Not too bad at all.
It is located on the bottom of the HVAC case under the dash. Remove the lower dash panel. It is near the center. Almost triangle in shape, 1 electrical connector, 2-3 screws hold it on. Should only take less then an hour.
After replacement, do the re-learn procedure above.
Yes, the one on the bottom is for the drivers side.
The one on the top is for the passenger side.
Passenger side motor requires removal of the dash.
the one you are having trouble with is on the botom, and do not need to remove the dash. Just the lower panel.