Im guessing you have the clicking noise that goes with a bad actuator? If so, you wanna change your climate control settings 1 at a time to isolate it. Usually i put the air in vent mode, then i put the temperature from full cold to full hot, if its dual zone, do one at a time. If no noise, then turn the recirc on then off. If still no noise, then cycle through the airflow positions. You should be able to isolate it this way, and i believe all actuators are relatively easy to get to.