Quote:
Originally Posted by tjts1
No, this is incorrect. The electric fans on the W210 are far more powerful than the viscous fan. The problem is MB setup the trigger temp too high to make them useful. Reduce the trigger temp down to 85 or 90c and the electric fans can cool the car on their own with the viscous fan removed. Swap the second belt driven fan for a second electric motor and the setup is even more powerful. If setup correctly, E fans can run full speed while the engine is at idle. The viscous fan can only turn as fast as the engine... idle.
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+1 The electric fans supply three times the airflow of the pump fan at idle. The only reason they are ineffective with heat soak is that the nutty Mercedes control systems don't activate full speed operation until the engine is already close to overheating.
However, I wouldn't go so far as to say that the viscous fan runs at engine speed, because I don't know the pulley ratio.