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My 2011 XT is making a whistling or high pitched swirling noise. I only does it above 35 MPH. Not sure if it is the brakes or perhaps a power steering pump? Any known issues that could be this sound?
 

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Alternator whine under load? Have someone step on gas in neutral while you look/ listen under the hood. If it is the alternator whining then you might need a new one before that one goes bad.
If it’s not that then idk, wheel bearing? Sorry I’m not much help
 

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2011 forester XT auto
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I had same issue, turned out to be power steering hose, and the fitting that the hose clamps on.Mechanic just replaced the hose, but the whining noise came back, it also required the fitting..no problems since. Good Luck !
 

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2011 Forester X Limited, 2007 Impreza Outback Sport SE 5MT
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Roof racks are probably your answer, pop them off again and see if it goes away. They can kind of be finicky to position just right so they don’t whistle like you are describing, I keep mine stored unless in use because of that very reason
 
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