Quote:
Originally Posted by Diseasel300
Not really. The electric fan is there as a booster to help cool the A/C condenser and to assist the engine driven fan if/when it can't keep up with the cooling load. If the clutch fan is operating correctly and the cooling system is healthy, the electric fan should NEVER come on unless the A/C is operating.
The electric fan moves a fraction of the volume of air moved by the clutched fan, even when at idle. It can prevent a runaway overheating situation, but if the engine and cooling system get heat soaked (and the A/C is running...) it won't prevent a slow overheating situation, especially if the car is sitting stationary like the OP's was.
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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.