Electric Fan : On automobiles, the electric fan is usually referring to a cooling fan. Other electric fans on vehicles cool the turbo chargers are called afterburner fans. Electric fans are controlled by relays or computer modules. Electric fans run on 12 volts DC and serve the purpose of cooling specific parts of the engine’s cooling system and or air conditioner condenser. When there is a problem with an electric fan, an engine can overheat. Electric fans can become noisy or overload a circuit of a computer.