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Message: <blockquote data-quote="Lee36328" data-source="post: 208462" data-attributes="member: 113">That's almost exactly what happened to me.You coolant was leaking out of the cap of the expansion tank, in my case it was the connection between the return hose and the expansion tank, and spraying all over the engine.  That smell you detected was the coolant being fried by the engine.  Footnote : I used to complain that the aircond air circulation flap does not fully close on the bimmer.  Now I find it a blessing because you can immediately smell the engine if it overheats... Wonder if this was part of the reason the flap does not close entirely.. At any rate, it is a benefit in this case.Your temp needle was still at half because the engine was sucking coolant from the expansion tank, returning it via the return hose, and spraying it out via the cap, thereby rapidly emptying your expansion tank.   Any further, and your engine will totally dry up and the temp needle will move.  No doubt about it.  Seems you stopped in time before that happened.</blockquote>