American Volt 180'f Electric Radiator Fan Thermostat Sensor Switch 3/8" Inch Thread Grounding 180'F automotive engine grounding fan switch. 3/8" NPT brass thread-in temperature probe. Activates fan at 180 degrees and turns off at 165 degrees. Universal fit for any application with a 3/8" NPT port. Threads into engine block, radiator, manifold or water outlet.