Whilst I had my head buried under my hood this evening, I found this disconnected vacuum line. It resides between the IP and the windshield washer reservoir. It was routed near the master cylinder. I have no idea where it is supposed to go. I have capped it off.

Anyone know where it is supposed to connect? Inside the cabin?

Thank You!

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1987 300 TD - Kraut
1987 300 D - Hans

the black one coming out of the side of that "box"? that is a vent line for your transmission's VCV valve. it dumps off vacuum the more your accelerator moves for firmer shifts. that line is supposed to be routed into the cabin and left open at the other side of the firewall so it doesn't draw nasty engine bay air into your vacuum system. i think it may tie in to a large black like that goes to all the emissions crap behind the passenger headlight but i removed all of that so not exactly sure.

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83 300CD- sanden, dual p/f condensers, 160a alternator, ect
91 300TD- 722.6, #22 head, 3.5L IP, w140 manifolds, ect

Here is an article by Sixto that details the VCV. HTH

PeachPartsWiki: Vacuum Control Valve Replacement

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Treetops
06 E320 CDI 127K Miles
87 300TD 231K Miles

99 E300 269K Miles-Sold

There are 2 vent lines to the cabin, and yes that is so that when the system needs to relieve vacuum it draws relatively cleaner air from the cabin.

One is from the VCV which is in your picture. The other goes to the emissions control vacuum transducers behind the right headlight.

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech