Steering Failed problems of the 1999 Oldsmobile Aurora

Steering failed while turning left on 1999 olds Aurora with 34,000 miles with no indication of a steering problem before the failure. Turning right was fine, but the car could not make any left turn unless it was only a minor movement to the left while traveling at less than 10 mph. Gm paid for 50% of repairs, but a failure like this with no warning needs to be addressed. My wife was using the car and the steering failed while she was parking it. If the failure had happened while she was driving the car I can guarantee there would have been an accident because when the steering fails, instantly, you can't make a left turn under normal driving conditions.