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#1
06-26-2007, 04:31 PM
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81 300CD vacuum line question.
So, theres a black vacuum line that runs through the firewall, it connects to the Y connector at the VCV, but currently isn't connected to anything inside the car! I found this on like day 2 of owning the car (its been about 5 months now). I plugged it up, because it is def getting some vacuum. So my interest in finding where it goes was resparked when I was helping my friend with his 84 240d and noticed his wasnt hooked up to anything either! His is much shorter than mine (only about 8 inches show through firewall inside car where mine is about 2 ft).
Anyway, I had originally thought this would have something to do with my ACC, but I pulled the dash all apart one day and, as far as I could tell, everything was in place. Its a total plate of spaghetti back there, so kinda hard to tell. My friends car doesnt have ACC so, I am gonna rule that one out anyway. Any ideas? As I said, its the BLACK one. Thanks in advance for your responses!
__________________
1981 300CD 260k w 60k on new motor 1983 240D 4spd Manual 
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#2
06-26-2007, 04:34 PM
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The black line that comes through the firewall into the driver's kick panel area on a 123 is a vacuum vent line, meaning that it lets vacuum off to protect your components.
It basically allows air into the system to keep the vacuum at 15 PSI. I would advise that you unplug yours to protect your vacuum pump and vacuum diaphragms. They can survive more than 15 PSI, but it will cause damage over time.
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1984 300DT turbo 138k mi Still hauling me to school and back. Handy Site: http://www.dieselgiant.com/
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#3
06-26-2007, 04:39 PM
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Wow, well, that would explain why they were both disconnected! Thanks man, I'll unplug it immediately.
__________________
1981 300CD 260k w 60k on new motor 1983 240D 4spd Manual
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#4
06-26-2007, 04:49 PM
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I actually wondered about that too. My brother wondered about it when he had the car, and my dad wondered about it too. Fortunately my dad didn't want to mess with it because he mostly worries about his car, and my brother basically didn't touch anything not involved in driving for the three years he had the car. He would notice that the A/C was dying, the radio was shot, and all sorts of vacuum problems, but he never did anything.
Then I looked it up. I swear, Mercedes should have put a label on those things. People wonder about them, and it's really hard to guess their purpose.
__________________
1984 300DT turbo 138k mi Still hauling me to school and back. Handy Site: http://www.dieselgiant.com/
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#5
06-26-2007, 04:55 PM
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Yeah... I mean, the way it just hangs behind the dash sure makes it look like it should go to something. Thanks again for your help. Its been unplugged.
__________________
1981 300CD 260k w 60k on new motor 1983 240D 4spd Manual
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#6
06-26-2007, 06:29 PM
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Quote:
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Linear Mode
