Audi Repair Questions? Ask a Mechanic for Answers ASAP
That sounds to me like the temp flap motor is not adjusting the flap properly possibly a failed motor. You could scan the HVAC system for faults if you have a scan tool available that can read more than just the engine module.
Or you can lay under the passenger side of the dash, take some of the covers off, and operate the temp controls, watching the motor to see if it moves.