I am having the same issue...last night while I was driving on the highway saw the warning message and car came to a stop...gave it 2 hours to cool down and still the same issue....any one know what is the issue? and how much would it cost?
Was reading this
http://www.bimmerfest.com/forums/arc.../t-438648.html and looks like it is electrical water pump failure which costs around $850
