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: 99,716 (10,400–247,000)
Engines affected: 3.0L 6 Cylinder, 4.4L V8, 4.6L V8, 4.8L V8, V8
9 model years affected: 2000, 2001, 2002, 2003, more2004, 2005, 2006, 2007, 2008
50 people reported this problem
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Viewing 1 - 20 of 23 problem details
2007 BMW X5 - 4.8L V8 57,000 mi,
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....
2007 BMW X5 - 3.0L 6 Cylinder 80,500 mi,
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.
2008 BMW X5 - 3.0L 6 Cylinder 85,000 mi,
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.
2004 BMW X5 - 3.0L 6 Cylinder 136,427 mi,
Hairline crack in the expansion tank, causing car to lose antifreeze.
2006 BMW X5 - 3.0L 6 Cylinder 135,000 mi,
Crack down side of tank. Had to replace expansion tank
2005 BMW X5 - 4.4L V8 174,000 mi,
leak from plastic fitting on engine side of hose. part # 17-12-7-509-967
2008 BMW X5 - 3.0L 6 Cylinder 61,605 mi,
Expansion tank split at the seam. Had tank replaced at Reliable Import Service in Raleigh NC.
2003 BMW X5 - 4.6L V8 100,000 mi,
replaced wt new container
2008 BMW X5 - 4.8L V8 51,000 mi,
Large crack. Dealer fixed for free.
2002 BMW X5 - 3.0L 6 Cylinder
Sides split on plastic overflow/fill tank. $800 to repair. Did water pump at same time--- Over $900 repair cost.
Just had the water pump replaced 2 days ago and today my coolant level light came on and have found that my coolant tank is leaking. Seems weird to me but after reading it may be a common problem...?
2006 BMW X5 - 3.0L 6 Cylinder 120,000 mi,
Hairline crack in coolant expansion tank, driver side corner
2000 BMW X5 - 4.4L V8 132,000 mi,
I noticed it starts to overheat when i accelerate harder. If i drive it normally its absolutely fine. The temperature gauge rises and when i open then bonnet the leak is on the actual cap of the expansion tank. Could it be that i need a new cap or should i just buy a new expansion tank??
2007 BMW X5 - V8 104,000 mi,
Water pump and thermostat went out first, week later, reservoir .
2003 BMW X5 - 3.0L 6 Cylinder 131,000 mi,
Had truck running charging the battery, after about 20 mins I see water gushing from underneath. I turned it off popped the hood and noticed a crack in the resivour box... Is this a recall item???
2008 BMW X5 - 3.0L 6 Cylinder 98,000 mi,
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.
2001 BMW X5 - 4.4L V8 160,000 mi,
Hairline crack in coolant expansion tank - replaces tank
2006 BMW X5 - 3.0L 6 Cylinder 80,000 mi,
Hairline cracked.
2006 BMW X5 - 3.0L 6 Cylinder 110,000 mi,
hair crack in expansion tank.
2008 BMW X5 - 4.8L V8 70,000 mi,
leaking engine coolant