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Message: <blockquote data-quote="danzel" data-source="post: 219168" data-attributes="member: 6196"><p>certainly this is not a normal. several possibilities might happened. cap is not replaced properly after servicing. cap is damaged/worn out. <a href="http://www.stanscycle.com/bmw-radiator.html" target="_blank">bmw radiator</a> neck is damaged/worn out. either of the last too is rare (I don't think I've ever heard of this type of problem), but possible. my suggestion would be to inspect the cap and neck for any obvious problems. if none are found, replace the coolant with bmw coolant (if necessary) and reinstall the cap. carry some water with you and monitor the situation carefully. if it doesn't happen again, the cap must not have been on correctly.</p></blockquote><p></p>