Radiator fan: It is attached to the main engine's radiator and it is used to push fresh air through it.
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Under normal circumstances, the radiator can dissipate hear by itself, but when the engine is overexerted, it generates more heat and, at that moment, the electric fan must start working to help dissipate this heat. When the air conditioner is turned on, this system also begins working.
Coming fans will not turn on when the truck is running. Only when the truck is off. I've replaced the coolant temp sensor and all cooling fan relays and fuses. It's making the computer think it's over heating so the truck acts like it's over heating even though it isn't.