* 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.