> wrote in message
oups.com...
>I have a 1995 audi Cabriolet that makes a short 3 to 4second HUM at the
> rear passenger side of the car. Itusually happens when I have been
> driving for while. The hum happens while parked or moving. Is the
> alternator in the rear?
> Thanks
>

If you knew what an alternator was you'd know where (not) to find it.
The hum could be the fuel pump. The tank has a special, double bubble
design.
Nothing to worry about.

Ronald