When my A.C. wouldn't work it was a simple fuse that appeared okay but needed to be sanded with fine emery paper, to get a good contact for the compressor to come on.
Do you have a Hayne's manual or Chilton's manual for your car? Those would help a lot.
Try using the search menu on this board to look up many of the topics you need to know about. You will get a lot of good information that way.
Have someone turn the steering wheel back and forth while you look at the steering components. You may be able to tell what part is "giving" under the strain. The "weak link".