Did you have any coolant leaks while you were trying to get the problem diagnosed? Did a lot of pressure build up in your reservoir? I wanted to try a little more troubleshooting before going after the pipe. When did you finally know for certain that it was PIPE?
2002 BMW 745Li 102k
1991 Mercedes 300D 2.5 turbo 338k
1993 Mercedes 300E 2.6 192
1995 Mercedes E420 160k