My C32 had a clicking sound that just appeared one day at about center way of the dash, took it to the dealer and they it was a $20 plastic lever, and a weak blender motor $40, labor $1,700

. To make a long story short I knew the sevice tech at the MB dealer, and he did it for $600 labor on the side. The whole dash board, steering colume, and center console had to come out. I hope this isn't your case but just giving you a warning. Oh, and if you have to go through what I did have them replace all the motors in there I think its a total of four, this isn't something you want to go through twice. Good luck