Justjake
Junior Member
To check Harley radiator fans, turn the ignition on, then hold the throttle about half-open while the engine is off. The fans and coolant pump should both run until you turn the ignition off. If the fans don't turn on, or the pump isn't vibrating, there could be an issue with the fans, pump, or electrical system, and further testing with a multimeter or visual inspection may be needed.