My little plastic nub just popped off the radiator again. The parts department called it just a fitting, part number 0005000894. It only cost $8.00, so tha is much better than the head gasket. I wonder why it is doing that now. The dealer told me that they do not remove it during the flush or when they were replacing the water pump, but it seems odd that it is doing it now. As many of you have said, it is 11-years-old. I may try just spreading the ends a bit, until I can get back to the dealer. It looks like it is simply held in place by the pressure of the fit. Again, that seems rather odd for such a sophisticated machine, with a radiator cap that is pressure sensitive. Why would they have that second very simple little plastic thing that can just pop off?
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I just couldn't give up on my 1995 E320.

I think it might be like always going back to that same bad relationship with an ex girlfriend.
You feel you love them too much, or you are just too stupid to know any better.
Flickr slideshow of my 1995 E320
http://www.flickr.com/photos/24145497@N06/sets/72157616572140057/