It should be noted that A/C works, the fan blows at all 3 speeds, and the zone selector works (feet, face, windscreen).
Is the actuator toward the bottom of my photos? I might not be able to access it without pulling the clam.
This is the little plastic cover over the actuator. You should be able to just force it off to expose the actuator. To actually remove the actuator though requires removal of not just the clam but the whole heater core and some AC lines. It is all similar to the resistor pack replacement (lots of threads on that subject) so you realllllly want it to be wiring or a stray stick wedged in there or something.
"Lots Of Trouble; Usually Serious"