Product Details: Equip your semi truck to be Ready for the Road Ahead™, with the Velvac Universal Fan Clutch Drive Solenoid Kit, a key piece that seamlessly engage the fan clutch. Due to its partnership with the ECU, this replacement valve is able to detect when an engine's temperature rises above a certain level, allowing the solenoid to activate the fan clutch and engage a cooling fan. Constructed with an efficient design to help improve overall engine performance and fuel efficiency. FleetPride is your First Click in Heavy Duty®.