My "Big Benz" runs at the halfway mark between 175 and the red zone in traffic, but if I open the hood, the radiator won't be very warm. I've concluded that either the new t-stat isn't 75C or the temp gauge is a bit off. More likely the later, it's 31 years old.....

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!