Hey guys. There's a thing I'm guessing is some sort of solenoid for the EGR valve that has a vacuum stem deal broken off of it. There's a picture below (circled in red). It looks like it has 3 vacuum ports on the top (one of which is broken) and one on the bottom. The blue vacuum line runs around to the front of the motor and connects to 3 other things. Is that "leg" of the vacuum being broken going to cause a vacuum leak, or is this something that's sealed off? My locks work, engine shuts off normally, etc. so I'm guessing it's ok. Should I clog the broken hole up with some hot glue or some such just in case? If the entire thing can be removed (and some associated vacuum lines removed) I'd like to do that just to make the vacuum system less complex.

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2010 Mercedes E350 4Matic - 77k miles
1986.5 Nissan D21 V6 4x4 - 276k miles
1987 Mercedes 190D 2.5 Turbo - 3??k miles
1983 Mercedes 300SD turbo parts car
2017 Honda CBR500R - 15k miles
2016 Suzuki GSX S1000 - 9k miles

That's a vacuum transducer, usually used for the EGR valve or the ARV. The nipple that's broken off is the atmospheric vent, probably why you have no operational issues. The original connection had a filter and a tube running into the driver's footwell.

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Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Ah ok cool. If it's just a vent then I'll leave it be. I didn't even notice part of that thing was broken until I started working on the battery tray area.

__________________
2010 Mercedes E350 4Matic - 77k miles
1986.5 Nissan D21 V6 4x4 - 276k miles
1987 Mercedes 190D 2.5 Turbo - 3??k miles
1983 Mercedes 300SD turbo parts car
2017 Honda CBR500R - 15k miles
2016 Suzuki GSX S1000 - 9k miles