Horton's Modulator Fully Variable Fan Drive, No. RCV250, helps improve engine cooling efficiency for global applications. Coming as an integrated belt-driven fan drive of lighter, compact design, engineered to turn larger fans that require higher torque. Its variable operation reduces fan noise, increases fuel efficiency and available horsepower. Product features include an integral fan speed sensor for close-loop control and a magnetic design that speeds reaction time, which in turn increases modulation and cooling. Its reservoir, actuator and valve system design allow for faster response time and lower off-speed to maximize efficiency.