Hey Barbara,
The steering box has gone out, what happens it the selector valve inside the box goes out only allowing pressure to get to one half of the box which causes the box to only work one way.
Here is a video that will show you what you are in for when replacing it on a similar car with diagrams below to show you how on your car.
https://youtu.be/KKeFqHLuRQ0
Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.
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Friday, December 2nd, 2016 AT 9:15 AM