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#1
05-11-2007, 03:02 PM
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Vacuum switch central locking
How do you troubleshoot the vacuum switch in the drivers door? I took out the switch and applied vacuum to the middle tee. I didnt get any vacuum. Do I need to get a new switch?
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'85 300D Cal 280,000 miles '14 GLK 350 60000 miles 
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#2
05-11-2007, 03:18 PM
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I do not know how to test it. All it does is direct vacuum to the locking or unlocking segments based on it's position.
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K 90 Dodge D250 5.9 Cummins/5 speed. 400K Gone and still missed...1982 w123 300D, 1991 w124 300D
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#3
05-11-2007, 03:23 PM
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I bet it leaks, most original ones do.
www.dieselgiant.com has a nice pictorial on how to replace them. I think he shows how to test it too. John
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 560SL convertible 1987 190D 2.5-5SPEED!!!  1987 300TD 2005 Dodge Sprinter 2500 158"WB 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#4
05-11-2007, 04:19 PM
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There was no test procedure on DGs site. The lock and unlock lines both hold vacuum. So Im guessing that if I pull vacuum on the middle tee and switch between lock and unlock...
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'85 300D Cal 280,000 miles '14 GLK 350 60000 miles
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#5
05-11-2007, 08:47 PM
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Here's a DIY Vacuum Troubleshooting Guide I wrote up on another forum. The door lock section starts on Post #5.
http://www.schumanautomotive.com/forums/showthread.php?t=2755
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Andrew '04 Jetta TDI Wagon  '82 300TD ~ Winnie ~ Sold '77 300D ~ Sold
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#6
05-12-2007, 12:19 PM
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The driver's door has an electric switch no vaccum line to it. Biodiesel has a good write up there that will help you out.
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If it ain't broke take it apart and find out why.  1983 300SD, 4 speed 1994 C280 1987 300TD wagon 1996 HD Road King Ride in Peace Eric Peterson, Harley of Macon
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#7
05-12-2007, 02:08 PM
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No electrics in my door system. Just checked the vacuum switch in the drivers door. It held vacuum in both lock and unlock position. Applied vacuum on the middle T and in the firewall(solid yellow line), it held vacuum as well. It lost vacuum while switching from lock to unlock and vise versa but thats normal right?
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'85 300D Cal 280,000 miles '14 GLK 350 60000 miles
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#8
09-10-2012, 01:11 AM
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Looking for a Troubleshooting guide on the W126...mine works sometimes, and sometimes it wont...I'm not sure where to look
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-SpecialDelivery 1985 300CD Silver/Blue H&R Suspension (Sold, still cryin over that) 1982 300SD Silver/Blue '85 OM617 (Sold) 1982 300D - Blue/Blue (Sold)
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