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  #1  
Old 04-17-2012, 08:55 AM
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Help with Vacuum system..what did I do?..'85 300td

1985 300td
I was poking around under the hood last night (mainly in the area near the injection pump), where there is coincidentally a bunch of vacuum lines which I had to shove out of my way. Now, the car won't stop when the ignition is turned off, the door locks don't work, and the transmission shift a lot "tighter": sometimes it feels fine but other times it shift at too low of speed and the rear end kinda "thunks". Everything works fine in the HVAC system but the lower vents aren't blowing any air now either. I looked at all vacuum lines the best I could (without getting under car) and noticed a few unplugged, but plugging them in didn't fix anything. Any ideas on what I may have done?? Thanks in advance.
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Old 04-17-2012, 09:12 AM
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Vacuum Diagrams
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Old 04-17-2012, 09:14 AM
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With that many problems I'm thinking you may have cracked the main line from the vacuum pump to the brake booster. How are the brakes?
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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Old 04-17-2012, 09:45 AM
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Thanks for the help.
Brakes seem fine...
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Old 04-17-2012, 09:54 AM
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Then start working your way downstream from where vacuum branches off from the main line from the pump to the booster and find the disconnected line or broken fitting.
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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Old 04-17-2012, 10:48 AM
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Or take some pictures and post them here.
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Old 04-18-2012, 09:12 AM
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Well I found the disconnected connection and all the issues were resolved (ignition, locks, lower vents). However, I also found (or may have disconnected while looking) another vacuum line, which I'm fairly certain went through the firewall into the area under the dash. It is now disconnected...however everything (that I know of) seems to work fine....hmmm?? As always thanks for the help.
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Old 04-18-2012, 09:27 AM
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That's a vent.
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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  #9  
Old 04-18-2012, 10:14 AM
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Quote:
Originally Posted by bpeters2 View Post
1985 300td
I was poking around under the hood last night (mainly in the area near the injection pump), where there is coincidentally a bunch of vacuum lines which I had to shove out of my way. Now, the car won't stop when the ignition is turned off, the door locks don't work, and the transmission shift a lot "tighter": sometimes it feels fine but other times it shift at too low of speed and the rear end kinda "thunks". Everything works fine in the HVAC system but the lower vents aren't blowing any air now either. I looked at all vacuum lines the best I could (without getting under car) and noticed a few unplugged, but plugging them in didn't fix anything. Any ideas on what I may have done?? Thanks in advance.
I think bad thermostat or short in thermostat wiring from the thermostat to the air handler.
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Old 04-18-2012, 11:29 AM
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Quote:
Originally Posted by kerry View Post
That's a vent.
You know...come to think of it, you may be right. The center dash vents have never really blown at all...I just always figured that how they were supposed to be. I couldn't find any disconnecting lines to plug it into after looking for a few minutes, so maybe I'll just let it be...I really don't like working up under the dash, not the most comfortable position. Thanks for the help.
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  #11  
Old 04-18-2012, 11:34 AM
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Center vents only blow on AC. If it's a black line, it's the vent.
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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  #12  
Old 04-18-2012, 02:33 PM
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OP: I think your misunderstanding, When Kerry says that black line is a vent, he means for the vacuum system. It isn't supposed to connect to anything. He doesn't mean it controls your vents.
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