Greeting Benz brethren -

My 81' 380SL seems to have the vents on the top of the dash stuck in the open position. Not only does it make the car less comfortable in the summer (as a lot of the cool air gets directed where it does't cool ME) but it also causes the windshield to fog up on warm wet days.

Has anyone encountered this - and / or can anyone tell me how to fix it. I am thinking it is a pneumatic issue, but would be just as happy if there is something I can reach under the dash to redirect it manually.

Thoughts, ideas, workshop diagrams --- anyone?