Coolant Loss Due to Leak from Expansion Tank on BMW 330i

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: 103,833 (45,500–160,000)
5 model years affected: 2001, 2002, 2003, 2004, more2005
10 people reported this problem
2 people shared problem details
2002 BMW 330i106,000
Expansion tank leaks
2004 BMW 330i160,000
Expansion tank required replacement.
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