Engine Cooling System
WARNING: This page does not describe the selected car, but rather 41 other vehicles, including the 2003 BMW M5, 2003 BMW M3, 2003 BMW 540i, 2003 BMW 530i, and 2003 BMW 525i. However, it is still accessible from the selected car via links, so may be relevant.
At operating temperature, an automotive engine produces excess heat. Heat is a by-product of all internal combustion engines. Modern engines operate at higher temperatures and therefore run more efficiently - less of the energy produced by burning fuel is turned into heat, and more of the energy is used to power the vehicle. However, they still produce excess heat.
The engine is equipped with a cooling system designed to remove much of the excess heat. When functioning properly, the cooling system maintains an optimum temperature for the engine.