This AFCO electric fan switch uses a ground wire to turn the electric cooling fan on. The thermal fan switch features a 3/8" NPT threaded stainless steel body with a threaded stud terminal for hook-up. Cooling fan switch activates a cooling fan relay (not included, sold seperately) when the bulb is immersed in coolant that is 195° F. When the engine cools to 185° F, the contacts on the fan relay switch open, and the fan stops automatically. Make sure the temperature fan switch bulb is submerged in the HOT engine coolant. Non-adjustable radiator fan sensor. ON @ 195° F. OFF @ 185° F. Uses ground wire to switch current to fan.
