==== Notes ====
  * there should be a check valve in the middle tube connexted to the of the actuator/control module of the door lock in the driver side. The black part goes to pump
  * tube color coding: green stripe is lock red is unlock (confirm this)
  * if you plug one side of any actuator it shouldn't move either direction
  * the red striped tube goes on the right of the actuator/control module of the door lock in the driver side (confirm this)

==== Reference ====
  * [[https://www.peachparts.com/shopforum/attachments/diesel-discussion/159882d1602698642-w123-master-door-lock-element-failure-main-door-vacuum-actuator-diagram.jpg|Door lock vacuum diagram]]
  * https://www.ifixit.com/Guide/Mercedes+W123+Vacuum+Lock+System+Diagnosis+Technique/20201
  * [[https://www.youtube.com/watch?v=4U-iQIobcdQ|video of door lock system explained]]
  * [[https://www.benzworld.org/threads/vacuum-door-actuator-repair.1613223/|Actuator repair]]