A radiator air intake screen maintenance system for a vehicle , said system comprising: a radiator fan for the vehicle , the radiator fan structured and operable to cool fluid flowing through a radiator for the vehicle; a fan motor structured and operable to rotate the radiator fan ; and a computer based control module communicatively connected to the fan motor and structured and operable to: during operation of the vehicle, control operation of the fan motor to thereby control the rotational speed and direction of the radiator fan such that during operation of the vehicle the fan is operated to implement a drop cycle wherein when implementing a drop cycle during operation of the vehicle a forward radiator cooling rotation of the fan is slowed from a full forward operating speed to a drop cycle speed for a predetermined dwell time such that debris collected on a radiator air intake screen of the vehicle will fall off the radiator air intake screen due to gravitational force, then absent control of the fan to reverse rotation of the fan and after the dwell time has elapsed the fan is returned to the full forward operating speed; and periodically repeat implementation of the drop cycle until operation of the vehicle is ceased. a radiator fan for the vehicle , the radiator fan structured and operable to cool fluid flowing through a radiator for the vehicle; a fan motor structured and operable to rotate the radiator fan ; and a computer based control module communicatively connected to the fan motor and structured and operable to: during operation of the vehicle, control operation of the fan motor to thereby control the rotational speed and direction of the radiator fan such that during operation of the vehicle the fan is operated to implement a drop cycle wherein when implementing a drop cycle during operation of the vehicle a forward radiator cooling rotation of the fan is slowed from a full forward operating speed to a drop cycle speed for a predetermined dwell time such that debris collected on a radiator air intake screen of the vehicle will fall off the radiator air intake screen due to gravitational force, then absent control of the fan to reverse rotation of the fan and after the dwell time has elapsed the fan is returned to the full forward operating speed; and periodically repeat implementation of the drop cycle until operation of the vehicle is ceased. during operation of the vehicle, control operation of the fan motor to thereby control the rotational speed and direction of the radiator fan such that during operation of the vehicle the fan is operated to implement a drop cycle wherein when implementing a drop cycle during operation of the vehicle a forward radiator cooling rotation of the fan is slowed from a full forward operating speed to a drop cycle speed for a predetermined dwell time such that debris collected on a radiator air intake screen of the vehicle will fall off the radiator air intake screen due to gravitational force, then absent control of the fan to reverse rotation of the fan and after the dwell time has elapsed the fan is returned to the full forward operating speed; and periodically repeat implementation of the drop cycle until operation of the vehicle is ceased. <EOS>