Why your fan goes on when you star car?

When you start your car, the engine generates a lot of heat. To prevent the engine from overheating, the cooling system uses a fan to circulate air through the radiator. The radiator is a metal coil that contains coolant, which is heated by the engine and then cooled by the air flowing through the radiator.

The fan is turned on or off as needed based on the temperature of the engine. When the engine is hot, the fan is on to help cool it down. When the engine is cool, the fan is off to save energy.

Some cars also have a fan that is used to circulate air in the passenger compartment. This fan is called the blower fan. The blower fan can be turned on or off independently of the engine fan.