* The engine is overheating. When the engine reaches a certain temperature, the electric fan will turn on to help cool it down. This is usually the most common reason for the electric fan to turn on.
* The air conditioning is on. The electric fan will also turn on when the air conditioning is on, to help cool down the condenser.
* The car is in "limp mode." If the car is in "limp mode," the electric fan may turn on to help cool down the engine and prevent it from overheating. This is usually caused by a problem with the engine or transmission.
If the electric fan is turning on frequently or for extended periods of time, it's important to have the car checked out by a mechanic. There may be an underlying problem that needs to be addressed.
