The Steering system of a vehicle includes the steering wheel, the steering column, the power steering pump, steering box, tie rods, links, idler arm, pitman arm, steering knuckle,  along with various lines and hoses and electronic sensors, relays and switches.  If any of theses items are not working properly, you can lose not only your power steering, but possibly the ability to steer the vehicle at all.  If you have any problem with you steering, give us a call and we can pinpoint the issue.