Weatherproof Electric Fan Relay

The Painless Wiring Weatherproof Electric Fan Relay (Model 30129) is a complete temperature-controlled fan management system engineered for applications requiring automatic cooling activation in high-heat environments. This weatherproof electric fan relay kit delivers precise thermal control with dual set-points: the fan engages at 185°F and disengages at 175°F, providing a 10-degree hysteresis band that prevents rapid cycling while maintaining efficient temperature regulation.

The system incorporates a 3/8-inch NPT temperature sensor that threads directly into engine block coolant passages or radiator fittings, offering accurate real-time coolant temperature monitoring. An included 1/2-inch NPT adapter expands compatibility with various mounting configurations. The complete kit features an integrated relay harness that handles the electrical switching load, eliminating the need for separate relay installation. Weatherproof construction protects against moisture, salt spray, and thermal cycling—critical for vehicles exposed to harsh conditions, extended idle periods, or continuous high-load operation.

This relay is ideal for hot-rod builders, off-road enthusiasts, tow vehicle operators, and engine builders who need dependable passive cooling management. Custom vehicle applications, non-OEM cooling systems, and retrofit installations benefit from the straightforward installation and proven Painless Wiring reliability. The fixed temperature set-points eliminate driver guesswork and provide consistent, hands-free fan control without requiring complex wiring or additional switches.

Painless Wiring is recognized in the automotive aftermarket for quality electrical components designed for custom and restoration projects. This weatherproof fan relay combines simplicity with durability, making it a straightforward upgrade for vehicles where reliable thermal management directly impacts engine longevity and performance consistency.