I've noticed something peculiar about my 240D: like many old 123's, the vacuum will bleed off over the course of a couple days if I don't drive it every day. BUT... while the door locks will stay in the locked position after the loss of vacuum, the trunk unlocks itself! This is a bad idea in our inner city neighborhood where thieves roam every night looking for cars to steal from.

So my question is, is this normal Mercedes behavior? Do I have to finally buckle down and chase the tiny leaks that cause loss of vacuum? My door key doesn't lock or unlock the trunk - perhaps some previous owner replaced the lock with one that doesn't match the VIN number; if I get a cylinder that comes with a key (perhaps even one that matches the VIN!), will I be able to unconditionally lock the trunk so that loss of vacuum doesn't unlock the trunk automatically?

Thank you for your advice.

Kurt

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- '79 240D - engine swap complete! Engine broken in! 28-31 mpg! Lovin' the ride!
- '86 190D (W201-126) - 2.5 NA engine, 5 speed, cloth interior, manual climate controls, 33-34 mpg (sold to forum member).