Hi all,
Thanks a million for your answers.

When I say Hot, I mean, while driving, at speed on the freeway, it runs at about 85 degrees. Normal, right (?) When I'm stopped, the tempature begins to climb. When it gets to 100 and things aren't looking to start moving soon, I turn on the heater. That can usually keep it around 105/110 depending on the tempature outside. My wife would drive it and it would get up to the 125 mark. (no, she isn't driving the car anymore until this is fixed)

So I did the "Try to stop the fan" trick very very carefully with one of the used radiator hoses. It stopped easily. Now, the Visco Clutch (spelling?) I guess has fluid in it that expands outwards when the car is running hot(?) I didn't think there was a switch that would make it come on is there? The AUX fan is a different story. I'll look into that one soon.

The fan spinning backwards. Interesting. I'll look into that one. That is possible. I wonder...

Ok, I'll keep you posted. The Visco Clutch is looking suspect. Any other ideas? I was able to bleed the radiator fluid... Good tip, I never would have known about that one.

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Kyle De Priest
2007 e320 Bluetec
2013 GLK 250 Bluetec