Fan Controller With Pipe Thread Probe

The DERALE Fan Controller with Pipe Thread Probe (Model 16739) is a precision engine temperature management system designed to maintain optimal coolant temperatures by automatically controlling electric fan operation. This fan controller kit integrates a 3/8-inch NPT threaded temperature sensor with a 25-amp relay and complete wiring harness, enabling straightforward installation in custom cooling circuits, high-performance engines, and heavy-duty applications where consistent thermal regulation is critical.

The controller activates the cooling fan at 180 degrees Fahrenheit and disengages at 165 degrees Fahrenheit, maintaining a tight thermal window that prevents engine overheating while reducing parasitic drag from unnecessary fan runtime. The 3/8-inch NPT probe threads directly into the engine block or coolant passage, providing accurate real-time temperature sensing without requiring adapter fittings. The 25-amp relay capacity accommodates most aftermarket electric fan configurations, from single-speed units to dual-fan setups. The included harness simplifies wiring and reduces installation time for vehicles receiving custom cooling upgrades.

This DERALE fan controller kit serves off-road builders, engine swap projects, track-oriented vehicles, and marine applications where factory cooling systems are inadequate or removed. It is equally suited for restorations requiring auxiliary cooling or custom-built engines operating at sustained higher output. The tight on/off band minimizes thermal cycling, extending engine and radiator lifespan while maintaining stable water temperatures under load.

DERALE's fan controllers are recognized in performance and marine markets for reliable thermal management. The pipe thread probe design eliminates compatibility concerns common with block-mounted bosses, making this kit a practical choice for custom engine installations where sensor placement flexibility is essential.