I found the other day that the vacuum line pictured below is unplugged. According to the most pertinent vacuum diagram I found, this controls the "vent to passenger compartment." What I'm wondering is:

A. Where can I find the location to plug this back into? The diagrams don't show what happens to this line after it passes through the firewall, and if one of the AC ones does, it's too confused to see.

B. If I just plug this up and forget about it what consequences would it have to my AC system?

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"I would rather be ashes than dust!
I would rather that my spark should burn out in a brillaint blaze
than it should be stifled by dryrot.
I would rather be a superb meteor,
every atom of me in magnificent glow,
than a sleepy and permanent planet.
The proper function of man is to live, not to exist.
I shall not waste my days in trying to prolong them.
I shall use my time."

-Jack London 1876-1916

1983 300CDT (running WVO since 12/05)
1981 300SD (parts car)

Don't worry about it, its doing just what it was designed to do. It's connected to "atmosphere" or it was something about MB thinking air would be cleaner from inside the cabin.

Its not supposed to be plugged into anything.

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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350

Speaking of vent lines.... The vacuum line that comes off the side of the IP...The connection has a boot to it than connects to the aluminum box on the side of the IP. This is a 603. Anyways, it has a wierd flare (?) to it on the inside of the box. Anyways, mine is broken but I was told it's a vent line to the passenger compartment. Do I need to cover the hole when washing the engine? You can't miss this vacuum line. It was a 90 degree fitting and can't be bought separately from the box, I asked.

If you don't understand I'll try to take a pic tomorrow.

Thanks
David

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2000 Honda Accord V6 137k miles

1972 300SEL 4.5 98k miles

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