200F Temperature Switch

The AutoMeter 200F Temperature Switch (model 3246) is a precision engine coolant temperature monitoring device designed for vehicle cooling systems requiring automatic thermal control. This 1/2 in NPT-threaded switch activates at 200 degrees Fahrenheit and deactivates at 170 degrees, making it ideal for managing electric cooling fans, fuel pumps, or other engine-mounted auxiliary systems that respond to precise coolant temperature thresholds.

Temperature-activated switches like this one operate on a bimetallic principle, where the 30-degree differential between ON and OFF points (200°F to 170°F) prevents relay chatter and extends component lifespan through stable switching behavior. The 1/2 in NPT connection fits standard engine block ports found on most domestic and imported vehicles, and the compact 5.65 x 1.15 x 7.75 inch form factor allows installation in tight engine bay spaces without interference with hoses, belts, or wiring harnesses.

This AutoMeter temperature switch serves engine builders, hot rod enthusiasts, and mechanics implementing aftermarket cooling solutions where OEM cooling fan logic is unavailable or inadequate. Vehicles with oversized radiators, electric fan conversions, or high-horsepower builds benefit from independent coolant temperature switches that trigger auxiliary cooling at precise setpoints. The 200F activation threshold aligns with typical peak operating temperatures for high-performance engines running pump gasoline, ensuring fans engage before thermal stress develops.

AutoMeter is recognized in the performance and restoration market for producing hardened engine instrumentation and control components. The 3246 switch represents the brand's approach to direct-fit thermal management—combining industry-standard NPT threading with proven bimetallic switch architecture that does not rely on electronic sensors or calibration.