Report: Coolant Loss Due to Leak from Expansion Tank
BMW Z4 Problem
Average Mileage: 69,531 mi (58,000 mi - 82,000 mi)
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.
Visitor, 2004 BMW Z4, 68,000 mi
Coolant expansion tank pinhole leak
Found a hairline crack in the coolant expansion tank that was causing a slow leak. I replaced the tank and the problem was resolved.
Visitor, 2004 BMW Z4, 58,000 mi
Top of the tank blew off.
Visitor, 2005 BMW Z4, 59,658 mi
expansion tank developed a leak