Lino,
Most of the posts you have ongoing here are 99% of the "bling bling" sort of stuff that most of the Mercedes-Shop members are not really interested in, especially on the technical help forum. You might find a better response in the Performance Paddock area, or here...
http://forums.mbworld.org/forums/forumdisplay.php?s=&daysprune=&forumid=27
These guys are mostly into 19" wheels, fake speedos, lowering springs, body kits, and the other stuff that will get little respose on this forum.
However, if you are having AC problems, CEL difficulties, and pretty much any other technical difficulty, the MB-Shop Tech forum is the best anywhere...