Thanks everyone for the replies. They are all very helpful, I am less concerned. When driving on the highway, say 50 mph or higher, air on or off, the temp is probably 87 degrees right on. The temp seems to only rise when idling in stop and go or just in park. Last night the temp was right at 100C and upon revving the engine you could definitely hear the main fan roaring. The only time I hear the aux fans on high is when I unplug the (fan) sensor on the water pump. How do you make them come on a little sooner? I think with the air on the temp is maybe 5C higher than with off. Actually, I think with the air off the car never goes higher than 95C. Last night with the temp at 100C, turning on the defrost button brought the temp to about 85C. The water pump and the thermostat are both new in 2/03. As for the water level in the tank, it is now about 1/2 inch over the line but is staying there, even when hot or totally cold. Thanks for all the replies again, I keep an eye on it and check back tommorow morning. It will be mid-to upper 80's this week.

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2002 Mercedes-Benz E320 4Matic
1995 Mercedes-Benz E320 Wagon
2005 Land Rover LR3 V8 SE
1999 Audi A8 4.2L quattro