Quite a number of PT's (including mine) had the power sterring pump fail. Not saying your is on the way out, but it's a known problem. Also, there's a recall for the auto transaxle PT's to have the power steering lines checked for rubbing. Can't say yours comes under the recall but stop by a dealer, ask about the recall and bring up the noise you've been hearing.
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 ...just CREWZIN along! ® . . . PT Cruiser Links Moderator 
2000 PT. Original Owner, 110,000 miles
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