American Volt 2 Pack 180'f Electric Fan Power Thermostat 1/2" Temp Switch Ford Big Small Block 2 Pack Power Thermostat 1/2 Inch NPT Brass Thread-in Probe. Preset at 180'F Turn-on/165'F Turn-off. Sends Power to Electric Fan at Turn-on Temperature. Measures Any Fluid Temperature Including Oil and Coolant. Threads Into Engine Block, Radiator, Cylinder Head, Manifold, Water Outlet etc.