High Pitch Whine 2007 Tahoe

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Plimbob

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Location
Des Moines Iowa
I have a high pitch whine in my 07 which I can hear only at idle. When it's first started it is less pronounced in park but detectable in drive and reverse. After it's warmed up it mostly constant
regardless. It is not loud enough to hear while driving with window opened or closed. I have checked the alternator and brake pump and it doesn't appear to be coming from those.

I thought it was possibly a vacuum leak but with the hood open I can't locate it, doesn't mean it isn't but I can't locate it if it is.

Feedback is much appreciated.

Thanks,
Tim
 

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