Coolant Loss Due to Leak from Expansion Tank on BMW 325i

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: 108,446 (11,000–200,000)
7 model years affected: 1990, 2001, 2002, 2003, more2004, 2005, 2006
99 people reported this problem
52 people shared problem details
2004 BMW 325i127,000
Coolant Loss Due to Leak from Expansion Tank
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2003 BMW 325i113,000
Coolant reserve tank is cracked. Replace once and within 6 mos happened again
2003 BMW 325i121,000
Had a low coolant light on when starting shut it off had low coolant.put some water in temporally was leaking out as soon as I filled it took to Midas they replaced tank did a flush and new coolant for 345.00. The crack was right down the middle of tank hard to see till tank was removed
Coolant warning sign on. thermostat ok in the middle range, but overheated in the engine.
2006 BMW 325i90,000
overheating, already changed t*stat, radiator fan sensor , and temperture sensor
2004 BMW 325i104,000
justbought vehicle 2 monyhs temperature stated to rise in started to run low on Coolant...have to replace weekly..
2003 BMW 325i93,000
The coolant would leak when the car sat idle in a parking lot or at home in the garage. I filled coolant and it would leak right after I drove the car. The coolant low sign in orange would show on the dashboard. Initially I though my battery fluid was low or the batter alternator was not charging my battery. But soon I found the issue. So I had to change the coolant bucket as that was leaking the coolant slowly.
2001 BMW 325i93,000
I just bought me a really nice 2001 BMW 325I, well I had it for one day and than it started to overheat. I didn't know why it was overheating, and didn't realize that the coolant is low. By the time i was able to add the coolant in it, it was too late. My car was damaged and damaged bad. Well the car broke down basically, it wouldn't start. So I had to get a tow and towed it to my mechanic. The story is BLOW GASKET, HEAD GASKET CRACKED, all because of a simple problem. So sad, repairs costly, est round 3k!!!!
2002 BMW 325i80,000
Needed a new expansion pump and hose.
2006 BMW 325i69,000
Running hot due to leaky coolant extention tank. Replaced it only to find out the real problem that caused the car to run hot in the first place was the thermostat and water pump were malfunctioning. After replacing all three and a $1200 repair bill, it's now running fine.
Tank cracked leaking coolant. Replaced
cooling system fails, continually runs hot, even after thermostat replacement
Water pump fail followed by coolant reservoir fail.
Car overheated without warning with white smoke coming out of the tail pipe. Replaced water pump, thermostat, upper and lower radiator hoses, fan switch and problem still not completely resolved. Coolant sensor disintegrated in expansion tank.
2006 BMW 325i110,000
Broke down on Christmas eve. Had it towed to the dealership. $1,100
2003 BMW 325i180,000
My wife said that the car lost power on the freeway and it wouldn't go faster than 20 miles, so I had it tow to my mechanic and after inspection he said that coolant had leaked into the engine chamber, cylinders 3 and 5 I believe and that BMW recommends replacing the whole engine block and not to attempt to fix it. Is this the only solution? Thanks
2001 BMW 325i13,500
Coolant gone after ten minutes of driving. Not fixed
2005 BMW 325i88,000
Dealer originally said it was the sensor and the hose which I got fixed last month. Now it's the thermostat and the expansion tank.
2003 BMW 325i151,000
Car started overheating and using cooland but didn't notice an obvious leak until the temperature did not register the car was overheating but had a very obvious coolant leak. Had already replaced the upper radiator hose as a small hole was found in that and then the problem just got worse and worse. Having to replace expansion tank now!
2005 BMW 325i85,000
Stopped at the store on a long distance drive. When started car, temp gauge started normal, then went immediately to red. Under hood there is a light mist of water spray, location unknown. Let the car cool down, drove one mile before temp gauge back in red. Had car towed to repair shop. Needs new expansion tank and rollers. No further damage found.
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