Coolant Loss Due to Leak from Expansion Tank on BMW X5

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: 94,022 (10,400–247,000)
Engines affected: 3.0L 6 Cylinder, 4.4L V8, 4.6L V8, 4.8L V8
8 model years affected: 2001, 2002, 2003, 2004, more2005, 2006, 2007, 2008
40 people reported this problem
16 people shared problem details
2007 BMW X5- 4.8L V857,000
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....
3 people like thisFlag inappropiate
2006 BMW X5- 3.0L 6 Cylinder135,000
Crack down side of tank. Had to replace expansion tank
1 person likes thisFlag inappropiate
2007 BMW X5- 3.0L 6 Cylinder80,500
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 service....at the dealer.
1 person likes thisFlag inappropiate
2005 BMW X5- 4.4L V8174,000
leak from plastic fitting on engine side of hose. part # 17-12-7-509-967
2008 BMW X5- 3.0L 6 Cylinder85,000
expansion tank cracked, towed to dealership for repair, replaced with new tank, cost me over $800 in total. crazy!!! my fetal $21K mistake. Just bought last month and this car already cost me so much trouble, don't buy used BMW, I may have to trade it in for a Japanese car.
2008 BMW X5- 3.0L 6 Cylinder98,000
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.
2008 BMW X5- 3.0L 6 Cylinder61,605
Expansion tank split at the seam. Had tank replaced at Reliable Import Service in Raleigh NC.
2003 BMW X5- 4.6L V8100,000
replaced wt new container
2001 BMW X5- 4.4L V8160,000
Hairline crack in coolant expansion tank - replaces tank
2006 BMW X5- 3.0L 6 Cylinder80,000
Hairline cracked.
2006 BMW X5- 3.0L 6 Cylinder110,000
hair crack in expansion tank.
2008 BMW X5- 4.8L V870,000
leaking engine coolant
2007 BMW X5- 3.0L 6 Cylinder
cracked expansion tank. replaced radiator and tank, $1000.
2004 BMW X5- 4.4L V8113,000
This is going to be my the 3rd expansion tank
2008 BMW X5- 4.8L V851,000
Large crack. Dealer fixed for free.
2005 BMW X5- 3.0L 6 Cylinder60,000
Expansion tank cracked causing loss of coolant and subsequent overheating. Possible major engine damage.
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