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: 114,867 (57,000–205,000)
7 model years affected: 1994, 2001, 2002, 2003, more2004, 2005, 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.
Coolant leak from radiator. Changed radiator then coolant started leaking from upper rad hose. Can't win for loosing with this car.
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.
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
1994 BMW 525i205,000
I've got a 1994 BMW 525i series and it was running fine until the altinater went out, I watched a video on YouTube and learned how to remove the altinater myself. I did so by removing the air filter and removing a couple other hoses, my step dad helped me put the new altinater in and it looks like he did it right, all the hoses are hooked up and the battery stays charged only now my car steadily overheats. It's says check coolant level and ill fill it up along with wiper fluid and ill get 2-3 blocks down the road and it says check coolant level and my car will be all the way in the red again. When I check fluids coolant and the windshield wiper are both empty. I looked to see if there were any leaks when I poured coolant in and I didn't see anything dripping down and also the car doesn't seem to overheat when its ideling, only when driving. My fans working, or spinning at least. I tried to rotate fan when cars off and it seems to rotate pretty easily going both directions. Someone please help. I'm a young single mom and I've had nothing but car problems this past year. I keep buying lemon after lemon and I need help. I don't have any choice but to drive this car and I can't afford to take it in to a shop. Any and all advice is welcome... =}
2003 BMW 525i102,000
im in the proces of replacing the tank
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