I always tell my family and customers, that on all the newer cars, I advise everyone to turn the BLOWER FAN SPEED to OFF- BEFORE moving any other nobs on your heater- a/c system.

When you have the fan blowing, and you select either hotter or colder, or any other position for your airflow. You slam the doors into their next position. Eventually , they are going to brake, ESPECIALLY if the fan is on HIGH SPEED!! If you turn the fan off 1st, it makes it so much easier on the doors and actuators!!!!!!!

You never use to brake these doors on your old cars, that were controlled by cables, instead of the newer electric actuated doors.

Brilliant engineering!!!