Coolant Loss Due to Leak from Expansion Tank on BMW 528i

An engine coolant leak may develop from the expansion tank resulting in engine overheating. When a cooling system component fails the entire cooling system should be inspected. It is not uncommon to find additional component have failed or are leaking.

Overheating can cause severe engine damage. If the engine begins to overheat it is recommended to stop at the first available location and have your vehicle towed to a repair shop.

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Average mileage: 146,666 (120,000–180,000)
2 model years affected: 1999, 2000
6 people reported this problem
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problem details
The impeller in the water pump is known to break or fall. This lead to the radiator and coolant reservoir to fail as well.
2000 BMW 528i 140,000 mi,
Overflow coolant tank cracked and leaked coolant.