I replaced the cap back when this thread was new, but I wanted to complete the thread and say that in fact it was just a problem with the cap.

With the new cap, I have no issues!

By the way, my system has been flushed at 30K intervals, I have a new water pump, new thermostat, and all new hoses, so it makes sense that it was just the cap. I am so glad it wasn't the head gasket causing the issue.

Thanks for the tip. If only all things were so simple to fix.

__________________
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/