Loose steering could be caused by any of the following
1. Steering box worn beyond adjustment
2. Steering box not adjusted properly
3. Pitman Arm joint worn
4. Drag Link end loose
5. Tie Rod End(s) worn out and loose
6. Ball Joints worn and loose.
Jack up the front end and put at least two jack stands under strong frame members. Lower the car down onto the stands and leave the jack under the car in the "up" position located under a strong frame section. Block the rear wheels securely. Grab each of the front wheels and try to turn them left and right and watch each of the links I described above. Then grab the wheel by the top and bottom and try to rock the wheel up and down/in and out to see if the ball joints are loose. Note that the jack stands should be as far out under the front suspension as possible to take the stress off the ball joints else they may appear to be tight yet they are just under spring tension. Locate the worn component and adjust or repair as necessary.
Humming noise from the power steering is caused (usually) by microscopic air entrained in the fluid. With the motor running turn the steering wheel from full left to full right several times. so this as many times during the week as you can. Each time you do it you will remove more of the air. Check the fluid level as the air is removed.
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