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Door lock troubleshooting (again)
Ok, I have a couple of days off starting on Thursday so I want to fix an issue with the 83 300D. The locks! Everything else vacuum operated works ok (Engine Shutoff, brakes, transmission ) So, where would be a good place to start and a logical progression?
I have read most of the troubleshooting posts and I have the vacuum diagrams and a decent hand held vacuum pump, I just need some input on where to start eliminating stuff. Thanks. Glenn
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2012 Mercedes ML350 Bluetec 91K (hers) 2005 Corvette 55K (fun car) 2002 VW Jetta TDI 231K (mine) 1998 Volvo S70 T5 Turbo 196K (kids) 1994 Ford F150 4WD 249K (firewood hauler) 1983 Mercedes 300D 376K (diesel commuter) |
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I would pull the carpets and then look under the plastic cover running down the outside of the footwell. All the vac lines for the door locks are there. Thats usually where I start troubleshooting the door lock vac. You'll find two 3 way connectors, one unlock(yellow/green) and one lock(yellow/red). Here is where each line goes for both sets of lines.
1. Master door lock switch in the drivers door 2. Driver's rear actuator. 3. Passenger side and trunk. On the passenger's side under the same plastic cover you'll find two 4 way connectors. Here is where the lines goes. 1. Vac coming from the driver's side 2. Passenger front door. 3. Passenger rear door. 4. Trunk and fuel door lock. Here are a couple pics of the lines in the footwells. 1. Driver's side. 2. Passenger side. Test each line by pulling vac on it, and work your way through the system This will tell you which actuators are leaking. Test both the lock and unlock systems. As one side can leak and the other won't.
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Andrew '04 Jetta TDI Wagon '82 300TD ~ Winnie ~ Sold '77 300D ~ Sold
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hand pumps suck! get a motorized one!
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Mr. Lazy I see
I've been using my hand pump mity vac for years. The only time it's a bear is when I've used it to test the vac reservoir. Other wise a few pumps tells me what I need to know.
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Andrew '04 Jetta TDI Wagon '82 300TD ~ Winnie ~ Sold '77 300D ~ Sold
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MityVac's can be cheeeep ... if your patient .. on ebay
I was patient.
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1985 300D 198K sold 1982 300D 202K 1989 300E 125K 1992 940T "If you dont have time to do it safely, you dont have time to do it" "The democracy will cease to exist when you take away from those who are willing to work and give to those who would not." |
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