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Where can i find a vacuum schematic for 1991 Mercedes 420 sel?

You can find a vacuum schematic for a 1991 Mercedes 420 SEL in the vehicle's owners manual. If you do not have access to the owner's manual, you can also find vacuum schematics online. Here are a few resources that may be helpful:

* Mercedes-Benz USA: The Mercedes-Benz USA website has a number of resources available for owners, including vacuum schematics. To access these resources, you will need to create an account and register your vehicle.

* AllDataDIY: AllDataDIY is a subscription-based service that provides access to a variety of automotive repair information, including vacuum schematics.

* Mitchell 1: Mitchell 1 is another subscription-based service that provides access to a variety of automotive repair information, including vacuum schematics.

If you are unable to find a vacuum schematic online, you can also contact a Mercedes-Benz dealership or an independent mechanic. They may be able to provide you with a copy of the vacuum schematic or help you troubleshoot your vacuum system.