My Dad's 4-door 240D lost proper vacuum control of door locks some time ago. A mechanic disconnected the entire vacuum circuit, for the passenger compartment, at the engine firewall, which solved any leak, but rendered the locks for the doors and trunk without any vacuum assist, at all.
I would like to repair this. I would also like to work while using a diagram for the vacuum circuit. Can anyone direct me towards such a diagram?
Thanks, John