1999 E320 RF Door lock vacuum failure
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1999 E320 4matic (210.082)
1999 E320 RF Door lock vacuum failure
RF door does not lock or unlock with fob or dash button. Can hear rushing noise, up near the lock button, when dash button/fob is pushed. Dr door lock and unlock with dash button or fob. Rear doors unlock with dash button/fob. RF and rear doors only lock with dash button/fob, if I push down, slightly, on the RF door lock plunger, while pushing dash botton/fob. Can see that the RF door lock plunger istrying to move, but not quite getting it done. Suspect vacuum leak near lock plunger. Ideas? CC
Last edited by ccibsen; Sep 18, 2019 at 07:39 PM.
MBWorld Fanatic!
Joined: Jan 2004
Posts: 5,939
Likes: 178
From: Seattle WA
99 E320
no keyboard theory is going to help much and you really need to systematically isolate the failure
by tracing each hose. it is more labor and patience involved. access is relatively easy if you
have a garage (vs a carport)
MBWorld Fanatic!
Joined: Jan 2004
Posts: 5,939
Likes: 178
From: Seattle WA
99 E320
it has been a half dozen years since I was behind the door paneling. there are some mechanical linkages
as well, so can't rule out something like something sticking or dirty etc. I don't recall being traumatized by
those exploratories, rather, found them fairly educational and learning about the mechanical operation
part of the door lock system.
oh, full disclosure: that photo was not from troubleshooting the door lock and air hoses but during a
complete replacement of the seats from standard to Designo (air bladders). so the carpeting was
pulled and hoses upgraded.
the hoses can get pretty brittle (age ?) so be careful handling them especially at fittings. they can also
leak AT the fittings...or split if flexed such as near a door hinge location.
as well, so can't rule out something like something sticking or dirty etc. I don't recall being traumatized by
those exploratories, rather, found them fairly educational and learning about the mechanical operation
part of the door lock system.
oh, full disclosure: that photo was not from troubleshooting the door lock and air hoses but during a
complete replacement of the seats from standard to Designo (air bladders). so the carpeting was
pulled and hoses upgraded.
the hoses can get pretty brittle (age ?) so be careful handling them especially at fittings. they can also
leak AT the fittings...or split if flexed such as near a door hinge location.
