1988 420 Sel
 

My vacuam door lock system started to malfunction last
week,only locking a at random areas. Its now stopped working completely,is there something one could look at without starting to take of door panels. thanks in anticipation

:confused:

Start nosing around under the hood in the vicinity of the brake master cylinder and see if you can find any disconnected vacuum lines. You may want to get a Mighty Vac and start testing vacuum lines.

the vacum pump for the door lock system is located in the spare tire well behind a metal cage with two bolts holding it in