You were right again Salty - the problem is gone and she is running like a cool champion. I think the main point I did not pick up on earlier was the slow process of refilling and the time and patients required. Just finished a 15 mile run and needed to top off the tank with about 12 oz of MB coolant - no leaks, I think it si the final air bubble getting out of the system. On to my next big issue - the power steering pump.

thanks again for the help.

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94 E500 (Silver/Black)