I have replaced the aux fan, the thermostat, hoses, viscous clutch and fan, had the MB dealership clean and flush the system and this car still idles at around 110c (on 90-95 degree days). When driving it hovers around 80c. I am about at my wits end with this thing. The radiator looks in good shape but I guess that is next. Any suggestions?

1973 450 SEL running hot at high speed

I have a similar problem. See my thread and compare actions for ideas. Have you replaced the water pump? Does the auxilary fan come on?

Cheers