Here's an interesting one. I've just got my new Sorento, my second one. First was manual, fabulous car. This one is auto. Now I have noticed that with the ignition on there is a distinct humming noise coming from under the bonnet (hood). Before I go back with it I thought I'd enlist the aid of diesel auto owners. So if you have a minute or two perhaps you could switch on the ignition and listen for any sound. This did not happen with the manual car. Thanks in advance for your help.