Just like an individual necessitates a liquid refreshment on dog days, a BMW requires a cooling liquid to keep itself cool all along the summer. The cooling system of BMW plays a pivotal role in the performance. Since the cooling system regulates engine temperature and avoids disintegration of parts, hence the engine will perform smoothly as long as the cooling system is in pristine order. By knowing the signs of a bad cooling system, you can call a BMW mechanic timely to have the issue fixed. And to know the signs, you should go through the slide.