Coolant Loss Due to Leak from Expansion Tank on BMW 525i

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: 109,734 (57,000–164,512)
8 model years affected: 1994, 2001, 2002, 2003, more2004, 2005, 2006, 2007
23 people reported this problem
9 people shared problem details
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.
First the expansion tank leaked and next it was the radiator so had to replace both.
2003 BMW 525i93,000
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.
Coolant leak from radiator. Changed radiator then coolant started leaking from upper rad hose. Can't win for loosing with this car.
2006 BMW 525i128,000
my coolant check light comes on after 2 or 3 days of driving I put coolant in it and its fine but i noticed it is leaking on the ground
2007 BMW 525i57,000
leak from expansion tank
2001 BMW 525i164,512
While driving my car I noticed a smell from the car n noticed it was smoking from over heat. It has this loud noise coming from within
2003 BMW 525i102,000
im in the proces of replacing the tank
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