low whining noise at low speed, much like a noise of low power steering fluid on 2007 Buick LaCrosse

This noise started about three weeks ago. Since then I have replaced the serpentine belt. The noise got louder and increases with acceleration up to forty miles per hour.As far as I can tell the belt tensioner seems to be OK. The noise is constant.

Asked by for the 2007 Buick LaCrosse
1 answer 1 comment
Try listening under the hood with the engine running. Don't get near any moving parts but try to locate the sound. I suspect a failing power steering pump.
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Thanks for the advice, sounds reasonable