2005 Lincoln LS

Noises problem
2005 Lincoln LS 6 cyl Two Wheel Drive Automatic

when I turn my car off, after about three or five minutes it will make this wierd creeking noise. The noise last for about 5 seconds, latley my steering wheel has been feeling stiff, an it doesnt feel like it is spinning as fast as it should it takes more effort to turn.I got someone to check my power steering fluid and they said it was fine. What could be the problem?
Tony Starks
October 24, 2009.

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