vacumm

hi all While working on my 230e ( 1990 w124) over the weekend I came across what appears to be a loose vacuum pipe but I cannot find any place to attach it to. The vacuum switch has an electrical connection on it and is located in front of the battery compartment while the tube passes...

I have noticed that there is a vacuum leak on my 230e. Everything works OK when the car is running all doors lock and unlock but when I go to the car to unlock only the drivers side opens until I start then engine then all doors open. I have also noticed that there is a hissing sound...