Thanks, Brian. Looks like I need to take a step back. I've got a small mityVac, so I will read the links and try to go through it from the beginning...

I'm still kinda new to some of the hands-on repairs and maintenance for this vehicle...

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Mine: 1987 MB 420 SEL - 66K (Dec 2019)
Mine:1991 MB 350SDL - 244K (Aug 2011)- Totalled 9/14/2016
Mine:1981 MB 300SD - 326K mi (July 1997)-sold
Wife's: 2008 MB C300 Sport - 110Kmi (April 2009)