Originally Posted by
myles
I have my car in pieces just like that at the moment so I will check next time I'm there. I will have to re-assemble some of it to be able to turn the igntion on. Hopefully I will be able to do that tomorrow afternoon if everything goes to plan with the evaporator replacement.
From memory that stepper controls the temp of the air coming out of the face vents and is controlled by the wheel between the two centre vents. When the car is off the vents are opened, and when the car is on they are closed if you have the wheel set to cold, otherwise they are open. There is also some control logic that help to control the temp correctly.
I'm not sure about how far it rotates, so will have to look at that.