Temp at 100C is normal. That is the temperature at which the engineers at Mercedes have selected to allow the car to run at during slow traffic. The thermostat will not even be fully open until 102C. Do a search.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record