From Alaska’s North Slope to the Gulf Coast and any climate in between, you’ll get better engine and cab temperature control by replacing your on/off fan clutch with a Modulator Variable-Speed Retrofit Package. Modulator and your truck’s engine control module (ECM) work together to manage fan speed on heavy-duty line-haul and severe-duty vocational trucks, where on/off fan clutches over-cycle or do not provide optimum performance.
For specific Cummins engine applications, the retrofit package contains:
Retrofit packages for applications that do not require the Horton Di controller use the vehicle ECM to directly control the Modulator.
Modulator Fan Drive assemblies include application-specific pulleys and mounting brackets, paired with rugged WindMaster HS11 fully molded fans for maximum efficiency. Everything needed for plug and play installation is engineered into the retrofit installation kits. See the product selection table for details.