1999 Mercury Sable, 146,000. Power steering fluid level okay and clean. Squeaks, as if rubber-on-rubber when turning right (intermittent) but no noise when turning left.
Does the noise occur if the vehicle isn’t moving and the steering is turned?
If you can get it to make the noise under this condition, have someone listen at the front tires. If the noise seems to coming from behind one of the front tires, it could be caused from a dry ball joint.