When the coolant reaches 185 215 the contacts on the cooling fan switch close activating a relay which directs current to your electric fan.
Electric fan with temperature sensor.
This trick electric fan switch is a normally open temperature switch with 3 8 npt male threads that screws into your intake manifolds water passage.
Fan thermostat temperature switch with 3 8 pipe thread 185 to 175 degree electric engine cooling fan thermostat temperature sensor switch fits 10 12 14 16 fan with pipe thread.
Fan thermostat temperature switch with 3 8 pipe thread 185 to 175 degree electric engine cooling fan thermostat temperature sensor switch fits 10 12 14 16 fan with pipe thread 4 4 out of 5 stars 135.