Temperature gauage strange on 2001 Mercedes-Benz S55 AMG

Just bought a 2001 S55 AMG with 67000 miles. Very clean, been maintained at BENZ dealer all along. Only issue I see so far, which I am not sure is significant, is that the temperature gauge starts normally low in the morning and then levels off around above 80 but sometimes fluctuates between 80-100 but never reaches 100. No leaks, no noises, no overheating, not sure what the ideal temperature is. Not sure if thermostat been changed.

by in Birmingham, AL on May 28, 2010
1 answer
ANSWER by on May 28, 2010
I would do a cooling system inspection. Make sure that your cooling fans work properly and that the system holds pressure. Then I would flush the system and replace the thermostat, only use Mercedes Factory Coolant and a factory thermostat kit. This is important.

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