Dual Fan Controller Thread In

The Dual Fan Controller Thread In (DERALE part number 16789) is a high-amperage engine cooling fan controller designed for vehicles requiring independent dual-fan management. This adjustable temperature-activated switch is ideal for custom cooling system builds, engine swaps, and performance applications where factory fan setups prove inadequate. Thread-in installation and dual 35-amp capacity make it a popular upgrade among hot rodders, truck enthusiasts, and automotive builders seeking precise thermal control without complex wiring or relay banks.

This controller operates via a 3/8 inch NPT threaded temperature sensor that screws directly into the engine block, coolant manifold, or radiator housing for real-time thermal monitoring. The adjustable activation range spans 150–240 degrees Fahrenheit, allowing users to customize fan engagement thresholds to match their cooling requirements and engine characteristics. Each of the two fan circuits handles up to 35 amps independently, supporting high-output electric fans, mechanical fan clutches, or a combination of both. The compact module measures 4.45 x 2.35 x 7.3 inches and weighs just 1.4 pounds, fitting easily into tight engine bay configurations.

Street rods, drag cars, off-road trucks, and restomod vehicles benefit most from dual-fan control, especially those running larger displacement engines or towing heavy loads in stop-and-go traffic. Installation requires mounting the control module in the engine bay or interior, then running power and ground leads to each fan motor and threading the temperature sensor into the appropriate coolant passage. The kit configuration simplifies setup for builders familiar with basic automotive electrical work, though professional installation is recommended for first-time users. Compatible with any 12-volt negative-ground vehicle system, the Dual Fan Controller Thread In delivers reliable, independent cooling regulation for demanding applications.