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  #1  
Old 10-02-2007, 02:19 PM
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1980 300CD vacuum hose question - blue hose?

I have another question about my 1980 300CD. This is a new car to me and I am learning the idiosyncrasies with the vacuum system.

I am trying to trace out a vacuum leak. As I look in the engine compartment, I see a loose blue vacuum hose coming out of the fire wall area. Does anyone know what a blue vacuum hose controls or where it should be connected? Are there web references or diagrams for vacuum hoses available for this car?

Thanks for any advice you might be able to provide.

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Old 10-02-2007, 04:52 PM
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picture is worth...

Can you post a picture?

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Originally Posted by timber_cruiser View Post
I have another question about my 1980 300CD. This is a new car to me and I am learning the idiosyncrasies with the vacuum system.

I am trying to trace out a vacuum leak. As I look in the engine compartment, I see a loose blue vacuum hose coming out of the fire wall area. Does anyone know what a blue vacuum hose controls or where it should be connected? Are there web references or diagrams for vacuum hoses available for this car?

Thanks for any advice you might be able to provide.
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85 300CD Turbo "Das Polluter" 230K sold for $3,000

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  #3  
Old 10-02-2007, 06:41 PM
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On my '84 CD, a blue vac hose comes out of the firewall to a check valve, then to a brown hose that goes back into the firewall, haven't the foggiest as to where it originates, or terminates.
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  #4  
Old 10-03-2007, 12:09 AM
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solid blue hose- seat back locks. only found on coupes.
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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
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  #5  
Old 10-03-2007, 10:06 AM
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interesting

my seat back locks don't work in any circumstance. I may look into this....

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Originally Posted by Johnhef View Post
solid blue hose- seat back locks. only found on coupes.

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98 BMW 323is
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