Genuine BMW 17137542986 Expansion Tank/Coolant Reservoir; With Level Sensor – BMW | 17137519219 376789731 W01331763099

The expansion tank on your BMW is a very important part of your vehicle’s cooling system. It holds excess coolant until needed by the engine and allows for expansion and contraction of the coolant as it heats and cools. It also regulates the overall pressure of your BMW’s cooling system by sealing and pressurizing the cooling system and raising the boiling point of the coolant inside. If the expansion tank develops a leak, your BMW’s cooling system will not seal, causing coolant to leak out and air to get in. Air trapped inside the cooling system prevents coolant from flowing which will overheat your engine. The genuine BMW 17137542986 expansion tank is the recommended replacement expansion tank for the 2004-2010 BMW E60 and E61 5 Series and E63 and E64 6 Series models, and the only expansion tank used by BMW for these models in the factory and in certified BMW repair facilities. Using genuine BMW parts to repair and service your BMW will ensure the parts you use are specifically designed for your vehicle, keeping your BMW running longer and stronger than the rest.

• 17137542986 is a factory original BMW expansion tank/coolant reservoir
• The 17137542986 Expansion Tank/Coolant Reservoir replaces cracked and leaking expansion tank/coolant reservoirs on 2004-2010 BMW 525i, 525xi, 528i, 528xi, 530i, 530xi, 535i, 535xi, 545i, 550i, 645Ci, and 650i models
• Promotes optimal cooling system pressure, raises coolant boiling temperature, and hold excess coolant until need by engine
• Comes with a new level sensor for gauge
• Cracked and leaking expansion tanks will prevent your BMW cooling system from pressurizing leading to coolant loss and air to enter the cooling system leading to the engine overheating
• Requires use of expansion tank cap 17117639021