2003 Bmw 745 Got This 745li Coolant System Still Boiling Out Expantion Tank Ive

2003 BMW 745
200,000 MILES
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I got this 2003 745li bmw and the coolant system still boiling out of the expantion tank ive changed the thermostat, and the water pump. the hoses get hard as a rock what could it be?
Dec 1, 2012 at 9:33 PM
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DOCHAGERTY
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A blown head gasket
Dec 3, 2012 at 5:17 PM
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