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Hi Gerby. I have the exact same truck and problem. Did you replace the actuator yourself? I bought the part and will tackle it in a few days. I am still not sure if a fuse needs to be pulled after the reinstall for the recalibration to take place.
Yep, sounds like the blend door actuator, mine started clicking when I started the truck so I replaced it before it went out. A bit tricky to get at one of the mounting bolts but definitely doable. Plenty of YouTube videos t look at to help you out. There are two or three actuators on the heat box, mine was the one under the radio/center console. Good luck.