So, the time has come to trouble shoot my lock system. All in all, system is working fairly well....all doors, trunk and gas door will lock and stay locked save for the gas door which bleeds off after about 7 minutes (at which time it "opens" or the pintle retracts and everything else stays locked). After pulling that actuator, I found the external rubber boot had a split and using the Mityvac, it would only actuate to the "unlock" position. I was able to repair that with some fine mesh and silicone. Checked with Mityvac and it worked in both positions after the repair. Prior to the repair it would bleed down after about 20 seconds, so 7 minutes is a step in the right direction, I guess? For some unknown reason, the car's vacuum system would actuate the gas door to the lock position but the Mityvac would not (more powerful vacuum signal?). Anyway, I'm guessing it may have a leak on the internal diaphragm. Trying to save 50 bucks. I realize the gas door actuator could simply be removed and the lines plugged (which I did) solving my problem, but I think there are other leaks as the doors lock and unlock very slowly (even with the gas door actuator removed). Time to dig a little deeper. One other observation is the right rear door lock is the slowest of the bunch (right in front of the gas door actuator). Not sure if this is relevant. Stumbled onto this site and thought I'd share. Good info and a methodical approach. Links to other related pages, too. This may have already been posted (more than likely) but I was "there" and thought I'd pass it along....cheers!
https://www.ifixit.com/Guide/Mercedes+W123+Vacuum+Lock+System+Diagnosis+Technique/20201
07-12-2021, 12:08 PM
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