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The electric fan has a thermostat as a switch at top right side of the radiator. It will only turn on when the coolant is really hot but not hot enough to cause damage to the engine.
The fan running from the engine is more reliable than an electric fan. Electric fan after time has intermittent contact problem or the motor jams. With the engine fan it will always work unless both belt broke. Note that Mercedes and BMW maintain the engine fan design rather than using electric fan like Japanese cars.
To test the fan whether it is working from time to time just disconnect the
2 terminals at the thermostat and make contact between them. You should see the fan turning. If it doesn't something is wrong with the wiring.
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