Hey guys, on my 2000 ml 320 one of the ac/heat unit knobs stoped rotating, even with a lot of effort it can be moved, it is stuck. The know is the one that controls the positions of the air flow (floor , panel,windshield). So i was just wondering how that comes out. I tried to get the wood trim off first but it seems like everything is coming off. Please if you have any idea on this reply or if you can send me in the right direction it would be great. thanks