My Daughters 2000 S70 started leaking from the rack and the power steering pump went out at the same time. I replaced the rack, power steering pump, and return line. Afterwards it turned left perfectly and was very labored returning back to the right. I turned it back and forth about 50 to 75 times to try to work the air out and it began working as it should. She drove it for a week and the steering locked and had to be towed home. I was told that I likely got a bad power steering pump so I returned it and got another new one. This fixed nothing is always locked where it will not return to the right. Any ideas?