I can manually change the fan speed and it blows at whatever speed I set it at, but best I can tell “Auto” isn’t adjusting the fan speed at all. But I wonder if that’s a side effect of the air not being that warm. In other words, I agree that it should be blowing like mad when set to max heat, but the system is smart enough not to blast you with cold air. When you start the car cold and set auto, it typically slowly adjusts fan speed up as the air warms up. Eventually it’s blasting you if it’s still cold inside the car. But when the air is lukewarm, like it currently is, auto should be blowing at about a “2” fan speed (which it is). Does that make sense?

Would you elaborate on this “porcupine” a little bit? Seems like that may be my culprit, and I wonder if I can trace this KCAN code to it.

Also, FWIW, when I crank the temp setting all the way up to 84, the air does get just a bit warmer, but fan speed still doesn’t change.