E39 can't turn heat off inside?

[mk2glenn]

I'm pretty sure the FSU only controls fan function

The stepper motor that controls the heat route vent sounds like it won;t or can't move. I've seen heat flaps stuck with jelly tots, wine gums, toy soldiers etc

I'm assuming the blue to red dial on the top middle outlet is being used??

Yea I've tried messing with it too but makes no odds


Is the motor or the flaps hard to get to? I really don't want pulling the dash or anything