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As far as I know, you cannot compare the vacuum system of a W123 300D and a W126 300SD to solve a door lock problem.
The W126 has an additional electrical vacuum pump for the central doorlock system (under the rear seat) and the W123 has a combined vacuum system with the central doorlock hooked up the engine vacuum system (as described by stevefbl).
greetingz,
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1990 300SL-24
1993 C250D with a minor 600+k kilometer
www.MBenzNL.com(the Netherlands)
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