Whining noise when making a left turn on 2002 Chevrolet Impala

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When I make a left hand turn there is a whining noise, that sounds like it is in my power steering, which is getting worse (louder) as time goes on. This does not happen when making a right hand turn. When I had my oil changed 2 months ago, they check the power steering flud which was fine. So I could be wrong about it being the power steering. Any ideas?
(2) Answers
Possible steering rack problem, have PS system flushed, can add 1oz. of Lucus oil stabilizer to new fluid!! It helps, done it befofe!
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