The speed is controlled by the dme with inputs from the temp sensor in the lower hose as well as the pressure switch the hvac panel.
Bmw radiator fan switch connector.
If you short the two pins the fan will run if not it s the fan itself and you will need a new fan motor.
The fan relay switch per bmw is located in the relay box under the rear of the gas tank in the middle of the right side.
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Remove the mount screw lift the relay and disconnect the connector plug on the base.
If it runs and the engine is still hot idle for 15 minutes the switch is kaput.
These cooling fans rely upon electric motor and they typically have a moderate to high slow draw which means that they are commonly controlled with a relay that relay controls the fans for the engine.
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Its a whitish color.
The fan switch is the two pin job on the right hand side of the bike under the fuel tank pre fi bike screwed in to the silver dish type expansion bit.
The aux fan in this engine has a fan connector with 3 wires in it blue 12 volts brown ground and a thin black wire that comes from the dme to supply pwm signals square waves to control the fan speed.
You want all of the parameters to be properly met so that everything.
Almost all modern vehicles rely upon electric cooling fans to pull air through the vehicle radiator to keep the engine cool.