I did a search for this but I couldn't find anything. My vehicle is a 1992 190E 2.3. The problem is with the passenger side vent, just to the right of the glove compartment. You know how there is that little lever that moves up and down so that you can regulate the amount of air coming out of the vent? It's broken, and I can't figure out how to replace it. I pulled out the louver but it doesn't appear that there is any way to get to that little lever. How can I replace this lever?