So replaced my passenger side (upper) blend door actuator since I had the famous clicking/knocking, and mine actually was constant and never stopped. After I replaced it I still get a few clicks once I start the truck and then it stops. AC and heat work how it should and have both. Any ideas of what else it could be causing these clicks now? I did the fuse pull calibration multiple times. Also, the lower does not click but I cannot switch from defrost and floor to front vents, it stays on vents. I removed the lower one and can manually push the door up and down. Assuming the lower needs replaced too!? Would this cause the upper to click at all? Thanks in advance! About to lose my mind over this.