Car Problem Reports

BMW 325i Coolant Loss Due to Leak from Expansion Tank

BMW 325i Problem
81 Reports
Me Too

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

Average Mileage: 106,379 mi (11,000 mi - 200,000 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, , 127,000 mi

    Coolant Loss Due to Leak from Expansion Tank

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  • ludy, , 67,000 mi

    Coolant warning sign on. thermostat ok in the middle range, but overheated in the engine.

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  • Visitor, , 113,000 mi

    Coolant reserve tank is cracked. Replace once and within 6 mos happened again

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  • Visitor, , 121,000 mi

    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

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  • Visitor, , 93,000 mi

    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.

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  • Visitor, , 90,000 mi

    overheating, already changed t*stat, radiator fan sensor , and temperture sensor

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  • Visitor, , 93,000 mi

    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!!!!

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  • Visitor, , 104,000 mi

    justbought vehicle 2 monyhs temperature stated to rise in started to run low on Coolant...have to replace weekly..

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  • Visitor, , 80,000 mi

    Needed a new expansion pump and hose.

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  • Visitor, , 69,000 mi

    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.

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