I had the same symptoms when the water pump failed (this year) on my 93 300E.

I've since learned to do a lot of work myself, and I understand that it is a frustrating and time-consuming task, but is a DIY job.

I wasn't very sure of my skills then, so I gave the dealer $860 to do the work. You can save over $500 if you do it yourself...

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car