I have a 1998 323IS...
I have been having noise issues from this unit but am not sure what it is to search for a replacement. It seems to be a vacuum of some sort. It turns on when I start the car in the cold and runs for about 3 minutes then turns off until the next start. Anyone have problems with this unit also?? Is this a common problem and it sounds like a bearing issue.
It is right next to the firewall on the passengers side next to the positive terminal access.