18in Fan Clutch Fan

The DERALE 18in Fan Clutch Fan (Model 17118) is a mechanical cooling solution engineered for vehicles requiring efficient thermal management without constant full-speed fan operation. Designed as a direct replacement or upgrade, this 18-inch fan clutch automatically modulates fan speed based on engine temperature, reducing parasitic load on the engine and improving fuel efficiency. This is the go-to choice for hot-rodders, daily drivers in high-ambient climates, and anyone seeking reliable, temperature-responsive cooling without electronic complexity.

The dual clutch bolt pattern provides flexible mounting across multiple engine bay configurations, while the six-blade design delivers optimal airflow at both idle and cruise speeds. Constructed from durable steel with a professional black powder-coat finish, the 18in fan resists corrosion and heat degradation in demanding under-hood environments. The mechanical fan clutch engages progressively as coolant temperature rises, pulling maximum airflow when needed and disengaging during cool-running conditions—a passive, maintenance-free approach that outperforms fixed-speed fans in mixed driving scenarios.

This 18in fan is ideal for street applications, performance builds, and classic vehicle restorations where OEM cooling setups fall short or where owners prefer mechanical simplicity over electric solutions. Installation requires alignment with your engine's water pump shaft and confirmation of the dual clutch bolt pattern compatibility with your radiator shroud. Weighing 5.25 lbs, it integrates seamlessly into most standard and custom radiator configurations, making it a practical upgrade for anyone looking to optimize cooling efficiency and reduce engine load year-round.