Our Outlook makes a humming noise when we are driving at low speeds. It sounds as if it is coming from the steering column. It begins at acceleration and stops after hitting over 30 mph or so. We took it to the dealership and they said all large SUVs do it and it is nothing. We drove in the Saturn with a family member who has a large SUV and she said her SUV surely does nothing like it...Anyone have any ideas or does anyone else's do this?