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Goto ww.e38.org and educate yourself on how to bleed the cooling system. You CANNOT use tapwater to top off the cooling system, only distilled water and either BMW or Zerex G05 coolant only.
Since this is happening, I can almost guarantee the rest of your cooling system components are going to start breaking as well since they're all the same plastic that your expansion tank is made out of. You'd be far better off to just replace everything in the cooling system, but it's up to you with winter coming up right around the corner.
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650hp 10 X5///M - Stage 2, Vibrant 1794's , gutted cats, custom intake, AC Forged 22's 325hp 98 BMW 740iL - ///M5 6spd, www.bavengine.com w/ Performance Option, electric fan, CF intake tube w/ heatshield, Mag 14816 w/ notched bumper, Bilstein/H&R Stage II/Powerflex 600+hp 02 Harley F150 - MHP900 Stage 3 engine, KB2.3, 8# lower, 60# inj, Walbro FP's
135hp 01 TL1000R - M4 full exhaust, K&N, Yosh box, -1/+2 gears, 2CT's
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