I've never owned a 300CD before but the locks on it behave a little differently than the 4 door W123 locks and I am wondering if their behavior is normal or not.

The vacuum locks work fine (I know that is unusual). The issue I have is this; if I am in the car and don't lock the driver's door I cannot manually lock the passenger door...only if I lock the driver's door will the passenger door lock (which is does automatically by vacuum).

Once locked I can unlock the passenger door from either inside or outside with the key and relock it again UNLESS the door gets opened in the interim in which case I cannot relock it unless the driver's door is unlocked and relocked. I am wondering if other coupe owners have experienced and it's normal this or if it is something wrong with this car's passenger lock?

The manual is of no use as it talks about rear door locks under the "coupe" heading so that's wrong since the coupe has no rear doors...

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Marty D.

2013 C300 4Matic
1984 BMW 733i
2013 Lincoln MKz