The water radiator sliders on the 109 and the 111 don't display actual radiator position, they only display if they are moving or not. Yes, i know it's confusing, but if you go to external view you can verify that they open and stay open even when you see the slider at center.
What i'm trying to say is that the slider doesn't tell you the actual radiator position. The way it works is
slider at top=radiator being opened
slider at bottom=radiator being closed
slider center=radiator steady/not moving
Just try going to external view and playing around with it, you'll see that they work just fine, it's just that the slider in the info window displays a weird choice of information
