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Does anyone know how to bypass the vacuum operated door locks. I’m told I need a new vacuum module for the passenger door and it is hard to find. cannot lock my passenger door either from the inside or the outside. I’m ok with just having manual door locks. My car is an’82 380SL.
 

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1987 560SL (L.Tonk) [92,700 miles]
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280 Posts
The utilization of pneumatic pressure-difference forces for completing certain functions in a vehicle is increasingly gaining in significance. Well known examples for the employment of such pneumatic forces are the adjustment of the firing point by means of a vacuum.
Automotive engineering must have been so much fun back then!
 

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'80 450SLC Afro RHD Ikonengold
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2,888 Posts
I'd be checking if CL module from W126 is usable and these must cost pennies.
I got a few in attempt to spruce up my CL that works without the need for engine vacuum.

I wish my car had mk2 CL with push/pull rather than double plumbing system
 

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1973 450 SL
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1,913 Posts
I can't tell from that picture. I used the diagram in 80-900 to identify and follow the vacuum lines from the vacuum reservoir under the right fender, along the inner right fender, along the firewall to a check valve (among many), then into the car. If you do that, you could disconnect and plug the line either from the intake manifold to the "T" prior to the vacuum reservoir, or the line from the "T" to the check valve.

Colors of the vacuum lines changed through the years and who knows what maintenance has been done replacing lines with alternate colors. I used the diagram to trace lines to and from components, taking notes of the colors on my car. My goal was to repair everything. I replaced every single rubber piece in the Central Locking and Climate Control vacuum system and a few diaphragms in vacuum elements (occasionally the entire vacuum element).

I've had my car for 9 years now. Last summer, I found a poorly repaired right side fresh air vent vacuum pod that was leaking and hooked up backwards. So . . . it took me 8+ years to sort out my vacuum system.
 

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1983 380SL (us), Former owner: 1965 190Dc
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1,340 Posts
One of the first things I did to my 107 after I bought her was to compare all the vacuum lines under the hood to the diagram in the online shop manual. I found several mis--connected lines. Once I the lines connected correctly and replaced several of the rubber connectors my auto power locks started working again.
 

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1973 450 SL
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1,913 Posts
One of the first things I did to my 107 after I bought her was to compare all the vacuum lines under the hood to the diagram in the online shop manual. I found several mis--connected lines. Once I the lines connected correctly and replaced several of the rubber connectors my auto power locks started working again.
+1

I don't know what it is about this vacuum system that makes people want to play with it and mess it up. My vacuum system, central locking and climate control, was badly tampered with when I got the car.
 
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