Small amount of steam coming from under hood on the left side. No temp gauge rise, just a little steam...then more. Within minutes more and more. Pulled off highway and immediately into nearest parking lot JUST as temp needle went red.
The PLASTIC tube at the top of the radiator broke clean off (and was now inside the flexible tubing). Not enough of the neck left to clamp the hose back on.
The best part was I only had the car a week. NO, I mean the VERY best part was that I was on my way back home after picking up my new wheels & tires. D'OH!
What were those BMW engineers thinking? A plastic neck? Worse yet, I have to believe it's possible to insert a threaded adapter (perhaps with a little work) and be able to re-clamp the hose. Dealer doesnt see it that way.
It's a sad ending...30 mi from home...towed to a stealer. Four figures to replace radiator. Painful initiation to the BMW Brotherhood.