It is highly recommended to replace the pressure cap, 17137516004, please order separately. 1 per car.
- 17137519219
- 376789731
- W01331763099
- 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
“Left/Right or Front/Rear” notes means the part fits the left or right side of the car. These parts are still sold individually and you’ll
need to select the appropriate quantity if you plan to replace more than one of this item.






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