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Message: <blockquote data-quote="maxkpp" data-source="post: 294252" data-attributes="member: 7204">No sifu here, but a blind helping the blind.The original e30 fan clutch works on the concept that when the built-in thermostat senses a rise in temperature, the clutch engages and thus the fan start spinning.For the proposed modification of adding an electric fan, the electric fan must be connected to a temperature sensor that will send a signal for the fan to turn on when the radiator gets hot. So you must connect the fan to this temperature sensor at the radiator. I donno... I suspect the E30 original radiator might not have this temperature sensor built into the radiator. So you might have to either modify the radiator or find one that has this temperature sensor and can fit into your E30.Another easy way out is having a switch inside the cab that you can turn on when the car/radiator get hot. Especially when stopping during a jam or at the traffic light, etc.Any one out there care to comment!</blockquote>