Hi I'm new to the forum.

I'm having some issues when I lock my car. I have a 95, C280, 92,000kms. It is only a manual key lock, no remote.

1) I can hear the trunk unlock, when I push in the trunk button it feels like it releases but the trunk doesn't open. After some coaxing, it will open or it won't open then it will fly open as I am driving down the street.
2) When I lock the doors, I hear a weird ping noise, I can't determine if it's coming from the back door, trunk or gas door.
3) This morning I put the key in the drivers side door and it wouldn't turn at all. I tried the passenger side and I was able to open the doors. I started my car to warm it up and tried to lock the doors with the spare key. The same thing happened with the passenger side - the key wouldn't move in the door.
4) The rear head rests don't work with the button on the dash to put them up/down. (I'm mentioning this because I've done a search and noticed that this is a common problem when there is an issue with the vacuum pump)

I've done a search on the forum and everything seems to point to the vacuum pump.

Just looking for opinions.


Thanks,
Shanna

 

i have a similar problem with a c180 i just spray wd40 into locks and that sorts it out not quit sure where the pump is on a 280 but it's either under back seat which you can check buy listening to the pump or its in the boot behind filler cap