I’ve been stumped for about a week on this and I am hoping someone can point me in the right direction. I recently got in my car and went to adjust the temperature on the drivers side when I noticed that the temperature control knob on the drivers side was unresponsive. When I turned the knob (left or right) nothing would happen. Usually the temperature settings will immediately show you up on the display above the navigation screen as soon as you move the knob in either direction and it will show the current temperature settings you have and the adjustments you make. The passenger side works just fine, but the drivers side is stuck on 75 degrees. The auto button works on the drivers side, but I cannot adjust the temperature up or down. I am thinking that it could be the Left Hand Blend Door Actuator, but something is telling me that the knob itself has failed and is not sending a signal to the Blend Door Actuator. Ford wants $200 just to run a diagnostics test and I cannot justify that if its something as simple as swapping out the Blend Door Actuator. Any help would be much appreciated.