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

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.

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K

90 Dodge D250 5.9 Cummins/5 speed. 400K

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 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

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

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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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

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

That sounds correct, when it's in the lock position the unlock circuit is vented through the 3-way valve in the divers door (and visa-versa).

w123...not electric

w126.....electric

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)

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)