Sorry to bring back an old post, but did the calibration method above work for you? I put a new actuator in and it moves very slow (not the sweeping movement I was imagining). It turns a little, stops, turns a little more, stops again, and so on until it gets to what it thinks is the end. I don't think it is closing the blend door completely, I have warm air but not hot. The pull the fuse method didn't work for me and am trying to figure out other ways. Hopefully the part I just got isn't defective. Thanks for your help.
-2000 Silverado RCSB 6.0 swap, 5 speed, Nelson Tune, Pacesetter LT's, no cats, CAI, 3.08 gears (have 3.73's, not sure when they will go in).
-2004 Silverado 2500HD ECSB 6.0, All Stock Except Nelson Tune.
-2000 Tahoe 5.3, Family Hauler, Also Stock.