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#1
02-06-2009, 05:03 PM
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Here's an interesting vaccum leak
After I use the door locks on my '85 300TD wagon, the motor doesn't shut off after I switch off the key. Which color vaccum line should I trace to solve this dilemma?
thanks! 
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#2
02-06-2009, 05:11 PM
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Might be a vacuum actuator (diaphragm) and not a hose. I just started having this problem in one of my cars. Mine is the driver's door actuator leaking (I can hear it).
__________________
 Gone to the dark side - Jeff
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#3
02-06-2009, 05:26 PM
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You can test the shut off by disconnecting and plugging the locking and HVAC vacuum. Yellow is for the locks, green for the HVAC, brown is for the shut off valve.
Does the engine shut down with the locks locked or unlocked?
__________________
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
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#4
02-06-2009, 05:36 PM
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If the engine shuts off with the door unlocked then the leak is likely in the lock side, the yellow with red hose. If the engine shuts off with the doors locked then the leak is likely in the unlock side, the yellow green hose. Though the leak is likely in either the rubber connector or the lock actuator.
Here is a DIY for troubleshooting your vac system
__________________
Andrew '04 Jetta TDI Wagon  '82 300TD ~ Winnie ~ Sold '77 300D ~ Sold
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#5
02-06-2009, 05:38 PM
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The mity-vac is a must have tool for the vacuum system.
__________________
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
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#6
02-07-2009, 01:02 PM
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thanks folks. got my project for this weekend.
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#7
02-07-2009, 07:57 PM
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I've had more than one rubber boot go bad, the boot that seals the shaft on the upper side of the actuator. That shaft is what moves up and down and locks/unlocks the door. So for me, the leak was always in the unlock circuit. I always had to make sure to lock the doors so the shifts weren't rock hard and the engine would shut off.
Biodiesel300TD's troubleshooting guide helped me out a lot in understanding how it all worked. Good luck.
__________________
1985 300TD-euro 352,000 mi 1974 240D (1?)52,000 mi - has a new home now
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