PWM Fan Controller 70Amp Capacity

The PWM Fan Controller 70Amp Capacity by DERALE (MPN 16797) is a precision electronic module designed for enthusiasts and professional mechanics who demand intelligent thermal management in high-performance vehicles and engine swaps. Whether you're building a custom hot rod, upgrading a late-model muscle car, or managing multiple cooling fans in a complex engine conversion, this controller eliminates the guesswork of fixed-speed fan operation and gives you real-time temperature-dependent control over your coolant circulation system. Purpose-built for serious automotive applications, it replaces crude mechanical fan clutches and relay banks with programmable pulse-width modulation technology.

PWM (pulse-width modulation) control works by rapidly switching power on and off to the fan motor, effectively varying its speed without resistive losses or heat generation that plague older rheostat designs. The 70-amp capacity means this controller handles dual electric fans, high-draw reversible fans, or single heavy-duty units pushing serious airflow through modern aluminum radiators. DERALE's implementation accepts a temperature input sensor—typically a thermistor mounted in the coolant gallery—and automatically modulates fan speed from near-silent idle operation through full-throttle maximum cooling. This approach reduces parasitic load on your alternator, improves fuel economy by eliminating continuous fan drag, and extends belt and bearing life by running fans only when thermal demand justifies it.

Professional builders favor this controller for LS engine swaps, 5.0L Coyote conversions, and carburetor-to-EFI restorations where OEM engine management isn't available or desired. Its compact footprint (8 x 2.35 x 8.6 inches) mounts easily under the dash or in engine bays where space is tight. The 2.3-pound unit integrates with both mechanical temperature switches and modern digital sensors, making it compatible with standalone ECUs, carbureted applications, and hybrid retrofit scenarios. Installation requires basic electrical knowledge—12V power supply, ground, fan motor leads, and sensor wiring—and the controller handles the complex thermal logic, protecting against overheating while maintaining quiet operation during cruising and spirited street driving.