I have an electric cooling fan, manually controlled by me with a switch. I usually only use it in traffic, where I turn it on when the engine temp creeps over 100C, and it brings it back down to 90C (my standard temp) within 3-4mins.

The only time It has ever been an problem was when going up a 1 mile 1 in 3 hill with 5 people and luggage in the car. I was doing 5150RPM in 1st gear, foot to the floor all the way (probably 20mph) and the electric fan couldnt keep up. I pulled ovet at 115C and let it cool down, even put the heating on to help it. I imagine the original fan locked up with the engine turning that many RPMs would have easily kept it cool.

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1991 W124 250D - 130k Miles