2001 Jeep Cherokee Power Steering

My power steering pump had been leaking. I started using this stuff guaranteed to stop the leak. The leak has stopped. The problem that I have now is that when I make turns to the left, I hear a whine and sometimes am not able to complete a turn. It almost sounds as if there is air in the lines. I never have this problem when I turn to the right...only the left. Any suggestions? I am a single working mom and do not have the money to stop and take it to a mechanic for a lengthy diagnosis only to find out they ripped me off. If you could help I would greatly appreciate it.


Thank you!
Barb