MBenz,

Interesting point that you bring up, this is a Canadian W140. This is the first Mercedes that I've had the pleasure of owning, so I had noticed in the owners manual that there was this option. Ofcourse I don't know whether it was a standard option or not. BmwTek did give me some info about the location of the vacuum pump ( in the trunk ), so my first move will be to see if there is a pump at all and go from there. Thanks to all...

Dan