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  #1  
Old 05-12-2011, 10:09 PM
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W115 vacuum system diagram

Does anyone have a diagram of the vacuum system?

If not could someone tell me where the lines that go to the trunk go to? Which one in the engine bay feeds it also?

Any info would be appreciated

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  #2  
Old 05-12-2011, 10:15 PM
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The lines in the trunk go to the vacuum actuators for the fuel tank door, and the trunk lock. Under the hood there should be a solid yellow line which feeds vacuum to the master vacuum switch inside the drivers side front door which controls locking and un-locking of the entire system.
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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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  #3  
Old 05-12-2011, 10:57 PM
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Hmm. My problem is my trunk is locked and I can't open it. The rest of the door locks work. I have one line though in the engine bay that isn't holding vacuum pressure I assumed that was the one for the trunk but I guess not.
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  #4  
Old 05-12-2011, 11:04 PM
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no that line under the hood is not for the trunk lock... Your key wont open the trunk lock?

What color is the line under the hood that wont hold vacuum? There is a vacuum tank for the door locks, there is a vacuum line going to the AC, another for shut off valve(300D only), and one more vacuum line for the cruise control if you have that.
__________________
1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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  #5  
Old 05-12-2011, 11:07 PM
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Join Date: May 2011
Location: Dallas,tx
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Nope I can't even turn the key in the trunk lock. I'm not exactly sure what color the line is (they're mostly black colored) I'll look when I go into work tomorrow though.
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  #6  
Old 05-17-2011, 08:52 PM
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Location: Dallas,tx
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Hey could you tell me which line runs to the transmission??
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  #7  
Old 05-17-2011, 08:53 PM
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Location: Florida
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76 300D doesnt use a vacuum modulator on the tranny. Shifting is control by the control pressure linkage.
__________________
1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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  #8  
Old 05-17-2011, 08:55 PM
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Join Date: May 2011
Location: Dallas,tx
Posts: 48
Quote:
Originally Posted by 79Mercy View Post
76 300D doesnt use a vacuum modulator on the tranny. Shifting is control by the control pressure linkage.
This is very good to know. Thank you! Gotta fix the sloppy shifting

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