Quote:
Originally Posted by topfrog007
I thought my car had a vacuum leak because the power locks will lock or unlock if the car was recently turned off, but if left overnight, only the driver side will unlock/lock. Car shows no other signs of a vacuum leak.
The same mechanic said that they were meant to be like this and that it does not constitute a vacuum leak.
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Few mechanics are familiar with the Mercedes anti-theft systems. There is a photoelectric sensor hidden in the rear windshield. When is senses that the sun has set, it opens a valve which dumps the vacuum in the door lock reservoir, making it more difficult to enter the vehicle without the proper key, thereby providing additional security during the hours of darkness. For security reasons, details of this system were intentionally omitted from all service manuals and electrical schematics.