See the attachment below. This thin black vacuum line is just hanging around under the dash. There's nothing obvious for it to connect to. I'm hoping it has something to do with my AC vents not working right and that someone here knows where it goes.

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Its a vent line. It's not supposed to attach to anything. The engineers that designed these cars ran it inside as it was an easy source of relatively clean air.

__________________
2004 F150 4.6L -My Daily
2007 Volvo XC70 -Wife's Daily
1998 Ford F150 -Rear ended
1989 J-spec 420SEL -passed onto its new keeper
1982 BMW 733i -fixed and traded for the 420SEL
2003 Volvo V70 5 Speed -scrapped
1997 E290 Turbo Diesel Wagon -traded for above
1992 BMW 525i -traded in
1990 Silver 300TE -hated the M103
1985 Grey 380SE Diesel Conversion, 2.47 rear end, ABS -Sold, really should have kept this one
1979 Silver 300D "The Silver Slug" -Sold

Oh! So I should probably reconnect it back in the engine and not plug up where it was connected

Thank you!

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Yes you should, lol. Your transmission will thank you as, if memory serves, its a vent for the VCV vacuum system which controls the firmness of your shifts.

__________________
2004 F150 4.6L -My Daily
2007 Volvo XC70 -Wife's Daily
1998 Ford F150 -Rear ended
1989 J-spec 420SEL -passed onto its new keeper
1982 BMW 733i -fixed and traded for the 420SEL
2003 Volvo V70 5 Speed -scrapped
1997 E290 Turbo Diesel Wagon -traded for above
1992 BMW 525i -traded in
1990 Silver 300TE -hated the M103
1985 Grey 380SE Diesel Conversion, 2.47 rear end, ABS -Sold, really should have kept this one
1979 Silver 300D "The Silver Slug" -Sold

If it's like mine there is a "vent filter" connected to it and that goes into the vehicle interior. Mine was hanging free in the engine area, when I connected to the interior I can hear a "venting" "buzzing" sound depending on the engine. It's kind of annoying. That's if were talking about the same line.

Does this help? Look at item 85.

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Hmm. That's weird. The other end of mine is connected to something in the engine. See attached picture.

Also (ignore the golf tee. My lock system vacuum problem was preventing a proper shut off so I isolated it)

Sent from my XT1060 using Tapatalk

Do you have one of these things?

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Yes, that white part on your engine that the "Y" goes into is the VCV, it's a bleed valve that controls vacuum to the transmission. That is the correct place for that line to go. You can actually see a small blue line "denoting vent" in the diagram that was posted above exiting item 65 which is your VCV

That's not stock...

__________________
2004 F150 4.6L -My Daily
2007 Volvo XC70 -Wife's Daily
1998 Ford F150 -Rear ended
1989 J-spec 420SEL -passed onto its new keeper
1982 BMW 733i -fixed and traded for the 420SEL
2003 Volvo V70 5 Speed -scrapped
1997 E290 Turbo Diesel Wagon -traded for above
1992 BMW 525i -traded in
1990 Silver 300TE -hated the M103
1985 Grey 380SE Diesel Conversion, 2.47 rear end, ABS -Sold, really should have kept this one
1979 Silver 300D "The Silver Slug" -Sold