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Product Description

The expansion tank is an important part on your BMW 540i, because it holds the excess water with coolant that your radiator needs. Over time, it can become cracked or damaged some other way, and when this happens you will want to replace it as soon as possible to protect your radiator and your engine. When replacing the expansion tank on any 1997-2003 BMW 540i, go with the best by choosing Behr. This Behr expansion tank can also be called a reservoir, and offers a place to keep that water and coolant so that your engine will be protected even in the harshest of weather.