Electronically controlled Severe Duty fan clutch by Hayden. Fits all Gen 4 Ram Heavy Duty with the Cummins ETJ engine.

When fully engaged, Hayden Severe duty fan clutches can keep the fan spinning at up to 70% of shaft speed. This improves airflow through the radiator and around the engine, improving cooling significantly. This is a must have upgrade for those who tow frequently especially up high elevations or in high temperatures.