Car Problem Reports

BMW X5 Coolant Loss Due to Leak from Expansion Tank

BMW X5 Problem
38 Reports
Me Too

Model Years Affected: 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008

Engines Affected: 3.0L 6 Cylinder, 4.4L V8, 4.6L V8, 4.8L V8

Average Mileage: 91,394 mi (10,400 mi - 247,000 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, , 4.8L V8, 57,000 mi

    Expansion tank was cracked. I purchased a new one and installed myself (very easy) and solved the problem. If only all of the other fluid leaks on this car were this simple....

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  • Visitor, , 3.0L 6 Cylinder, 135,000 mi

    Crack down side of tank. Had to replace expansion tank

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  • Visitor, , 3.0L 6 Cylinder, 80,500 mi

    Vehicle lost all fluid instantly, luckily as I parked at my house. No overheating warning. It cost 625 to replace tank and do full coolant system test and the dealer.

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  • Visitor, , 3.0L 6 Cylinder, 98,000 mi

    One inch hairline crack halfway down the side of the coolant reservoir. Low coolant light on dash. Not sure why this tank would crack. I've never owned another make of car that has this reservoir problem. Solution is replacing tank and hope the second tank won't fail. Never had an overheating signal on the dash.

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  • Visitor, , 3.0L 6 Cylinder, 61,605 mi

    Expansion tank split at the seam. Had tank replaced at Reliable Import Service in Raleigh NC.

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  • Visitor, , 4.6L V8, 100,000 mi

    replaced wt new container

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  • Scooter210, , 4.4L V8, 160,000 mi

    Hairline crack in coolant expansion tank - replaces tank

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  • Visitor, , 3.0L 6 Cylinder, 80,000 mi

    Hairline cracked.

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  • Visitor, , 3.0L 6 Cylinder, 110,000 mi

    hair crack in expansion tank.

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  • Visitor, , 4.8L V8, 70,000 mi

    leaking engine coolant

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