Thanks for the info ... I think I will take it to another repair shop/dealer with a better reputation ... I took it to HBL in Tyson's corner , Va ... no one has said anything good about them in the "Good MB repair shop" forum.

Since these systems aren't designed to need refills I have to wonder about a leak occuring after something they did accidentally at the shop. They were supposed to check the coolant system for a schedule B service from what I understand ... God only knows if that happened or not. There is just too much of a coincidence - worked fine when I took it there and didn't work at all when I brought it home until I got the codes and reset it.

I wish I could do this myself ... then at least if something went wrong I would have myself to blame.

Thanks for the education ... if you have anymore ideas or thoughts on this I would appreciate hearing them!

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1998 Black/Black C280 Sport w/ 81,000 miles