Most fans should come on when the coolant reaches about 200 to 230 degrees. If the fan does not come on, something in the control circuit is defective. Additionally, what are the symptoms of a faulty cooling fan switch?What is thermostat temp for electric fan?
Depending on the model, the thermostat (sending unit) triggers the fan on at 185°F. and off at 165°F. or on at 195°F. and off at 175°F. A toggle switch can be wired into the system to manually override the cycling of the fan. Pre-wired connector plugs into fan connector and the red wire is routed to the relay via an inline crimp connector.Where is the radiator fan relay switch?
The radiator coolant fan relay is located on the inside front of the engine compartment near the left headlight assembly. You have to remove the air filter assembly, then look for a simple square relay with 4 wires running into it. It is mounted with 2 screws. It is the only relay at that location.