Good Morning and Happy New Year,
This exact situation happened to us just last week. The drivers side was blowing cold, while the passenger side was toasty. After reading through all the posts regarding the air blend issues, I decided to try the unplug and plug back method. It didn't work for me. So I decided to order 1 through Amazon (Dorman 604239 Air Door Actuator). While the replacement was pretty straight forward, my big fat hands had some difficulty getting the the screws (3) out and the new ones in. That being said it works like a charm and we have control of the temperature on both sides again.