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Q:

Vacumn door locking system is not working on 1990 Mercedes-Benz 300SEL

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
This occurred within the last 24 hours. We have owned the car for 5 years with no problem until now.
(1) Answer
In the trunk under your spare tire is where your vacuum pump is located. Could be a bad line or a blown fuse or even a bad pump.