Mine is a 85 190E 2.3 8vlv, and in normal driving conditions it will keep a steady 85C, it used to be 80C, but the new thermostate is set for 85C apparently this is better. When stuck in traffic temps will go up to 100C and that's when the fan kicks in and cools it right back down to 80C.

I didn't like how the temp would rise up and fall down all the time, knowing a bit about metals I know this causes the material to tire out, so I put a switch in the cabin to control the aux fan and whenever I get stuck in traffic I switch it on, it keeps the car at a 85C steady even if I'm sitting in traffic for hours.

xp

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1985 190E 2.3L - a constant project.