All cars have plastic rads now, and all cars experience rad failure. MB makes a special coolant that extends life, but it's gonna happen.
Before you go off on the $300 price for a new MB rad, price one out for a Japanese car. Our Mazda rad priced out at $942 for the rad alone, plus install.
Anyway, Lebenz is from Seattle, try giving him a PM or e-mail to see if he knows anyone in your area...
1998 C230 "Black Betty"