180F Fan Switch Thremost Relay Kit 1/8in & 3/8

The DERALE 180F Fan Switch Thermostat Relay Kit is a precision engine cooling control system engineered to manage electric fan activation based on precise coolant temperature thresholds. This fan controller activates at 180 degrees Fahrenheit and cycles off at 165 degrees, maintaining optimal engine temperature in street performance, off-road, and marine cooling applications where reliable thermal management is critical to engine longevity and consistent performance.

The kit includes a 1/8-inch NPT temperature sensor probe, 3/8-inch NPT bushing adapter for radiator integration, automotive harness, and a 25-amp relay rated for sustained electric fan duty cycles. The 180-to-165-degree hysteresis window prevents fan chatter and reduces unnecessary relay cycling, preserving electrical components and extending fan motor lifespan. NPT thread sizing ensures compatibility with standard radiator bosses and cooling system configurations across most applications requiring aftermarket fan control.

This thermostat relay kit addresses cooling challenges in vehicles with upgraded engines, auxiliary cooling demands, or installations where factory fan control lacks precision. Off-road trucks operating in high-load conditions, street rods with modern electric fan conversions, and marine inboards benefit from the repeatable temperature control and relay capacity this system provides. Installation requires basic wiring and radiator boss access, making it suitable for experienced enthusiasts and professional shops alike.

DERALE is recognized for precision cooling control components across racing, street performance, and industrial thermal management. This complete kit eliminates the need to source individual relay, sensor, and adapter components separately, delivering verified temperature switching accuracy in a single package.