is there a normal temp range at a steady 60mph w/ac on? Mine stays just about on the next mark above the 80. radiator replaced. should have gortten water pump, too while there, I guess.

Exactly what it's supposed to be.

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Kent Christensen
Albuquerque
'07 GL320CDI, '06 SLK350

What year and model? For most MBs, the thermostat is supposed to start to open at 87C and be fully open at 102C. Anywhere between 80C-100C should on the highway should be normal.

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Ali Al-Chalabi

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