What causes the Mercedes-Benz C200 fan to run continuously?

1 Answers
OStella
07/30/25 4:03am
Mercedes-Benz C200 fan running continuously indicates that the vehicle's control computer has received a signal from the engine coolant temperature sensor indicating that the engine coolant temperature is too high, thus sending a signal to drive the electric fan to operate at high speed to cool down the engine. Possible reasons for continuous operation: If the coolant temperature is indeed high, the cooling system needs to be checked. If the coolant temperature is not high, the temperature sensor should be inspected. Fan control: The four-wire fan itself is a computer module. Firstly, the two thick wires are definitely one constant power line and one constant ground. Secondly, the two signal voltages, one is controlled by the engine's duty cycle signal voltage.
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