JOB IS DONE! I finished it a few days ago with new parts from mercedesshop.com's fastlane. It went a lot quicker than I thought it would. I figured I'd work on it over the course of 2 evenings after work, but after I got the damn fan belt on, everything else just snapped on. Easy!
Thanks for all your help and advice. I couldn't have done it without you!

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Kyle De Priest
2007 e320 Bluetec
2013 GLK 250 Bluetec