Electric Fan Controllerw /Relay Screw-In Probe

The FLEX-A-LITE Electric Fan Controller with Relay Screw-In Probe is a precision temperature management device designed for vehicles requiring automatic engine cooling control. This adjustable fan controller activates cooling fans based on engine temperature, preventing overheating while reducing unnecessary fan runtime that drains alternator load and fuel economy. It's ideal for hot-weather driving, towing applications, and custom cooling system setups where factory fan controls are insufficient or absent.

The controller features a screw-in temperature sensor probe that threads directly into the engine block or radiator for accurate coolant temperature monitoring. Operation spans a customizable 160–220 degree Fahrenheit activation range, allowing users to fine-tune fan engagement to match their specific cooling demands and vehicle platform. The integrated relay switch handles high-amperage fan circuits safely, protecting sensitive wiring and factory electrical systems while delivering consistent on-demand fan performance. The complete kit includes the controller unit and pre-assembled harness, simplifying installation and reducing fabrication time.

This controller benefits hot-rod builders, off-road enthusiasts, and drivers operating vehicles in extreme climates or heavy-duty conditions where engine temperature stability is critical. Installation involves mounting the controller unit, routing the harness to the fan motor and ignition source, and threading the sensor probe into an appropriate coolant passage. The compact 4.8 x 2.15 x 9.05 inch form factor fits easily under the hood or behind panels, making it compatible with both original and custom cooling systems across most automotive platforms.