Car Problem Reports

BMW 525i Coolant Loss Due to Leak from Expansion Tank

BMW 525i Problem
18 Reports
Me Too

Model Years Affected: 2001, 2002, 2003, 2004, 2005

Average Mileage: 107,950 mi (74,500 mi - 146,000 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.

  •  Rookie

    every time i drive my car it says to check coolant. i put in coolant and then a few hours later it says it again.

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  •  Rookie

    First the expansion tank leaked and next it was the radiator so had to replace both.

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  • bmwlemon, , 75,000 mi

    Coolant leak from radiator. Changed radiator then coolant started leaking from upper rad hose. Can't win for loosing with this car.

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  • Visitor,

    Coolant leak

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  • Visitor, , 93,000 mi

    First noticed noise from Electric Fan located in front of radiator, as the engine was idling why I was attempting to diagnose the source of the problem, the Engine Coolant message came up on the dashboard, about the time I read it the Expansion Tank Sprang a leak from the hot coolant water that shot out 4-feet into the air.

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  • Visitor, , 102,000 mi

    im in the proces of replacing the tank

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