What is a safe reading on the dash temperature guage in the summer heat, with the ac running, sitting in traffic? At what point is my engine over heating? Is 100 degrees C safe? That is 10 o'clock on the guage.

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Jacob Wissler Jr., Houston, Texas, 1984 300 SD

So long as the temp drops back down when you start moving, this is normal. You should hear the aux fan running in high speed intermittantly, and the visco clutch should be locked up. Check that by shutting the engine down while the temp gauge is reading 100C or higher, the fan should stop within one revolution. If not, replace (or refill) the visco clutch.

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!