Sounds like you made the correct assumption, and if it is running like you
suggest, you probably have a slow leak somewhere.
"harrry" <nomail> wrote in message
| I have started to hear what I can only describe as a 'motor sound' on my
| 2000 S320cdi when I start the car. It can last for 15min before it stops.
| However, if I use the airmatic system to raise the car the noise stops but
| comes back again after about 20 mins. I'm guessing that this could be the
| compressor for the suspension system and it has only started to happen
| the last two weeks.
| Has anyone come across this or is this normal?. There are no warnings