"Can you hear a roar when the fan cuts in at around 90dec water temp"

I dont quite understand....The engine fan is always on....As i understand, it never stops. The electric fans on the otherhand do kick in at around 95 degrees. But they dont make a difference, the temperature pretty much stays the same and if I continue to stay in gear and crawl in traffic the temperature rises and rises. I havnt taken the risk of seeing what happens if it keeps rising, because I have already dealt with the coolant boiling over out of the expansion tank.

I had read on another forum that the engine fan spins at different speeds depending on engine RPM. And the "fan clutch" apparently controls whether the fan spins correctly, according to the engine rpms.

Also today while I was in some slow traffic the temp rised to about 100 degrees, then as I pulled over to a parking lot, I reved the engine to about 3500 rpms slowly, this drastically brought the temp down within a second or two. In front of my eyes I could see the needle drop to about 85 degrees.

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190e 2.6 1990. 300,000 KM
C230 K 2000, 130,000 KM