The radiator fan is an important part of BMW’s cooling system. It pulls the colder air through the radiator, especially when BMW’s speed is too slow to pass the air through the grille. Broken wirings, insufficient coolant, faulty fan controller module- are the possible causes due to which a radiator fan fails to work. Its failure can result in engine overheating, and causes other serious consequences that are mentioned in the slide. Just be knowledgeable about the causes and symptoms- to avoid experiencing a stalled BMW in a remote place.