Whistling sound under the hood?

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Crowder99Yukon

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Only at low speed, RPM doesn't matter. Makes whistling sound when going slowly but goes away when you come to a complete stop.

Changed the belt last week, needed to be done anyways.
 
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Donnie Yukonie

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Ive had the same issue for years , does it sound like a small supercharger almost?
 
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Crowder99Yukon

Crowder99Yukon

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It does actually, hadn't thought about it that way but yes. And it goes away when you come to a full stop?

Sent from my HTC One S using Tapatalk 2
 
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Crowder99Yukon

Crowder99Yukon

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Def not a window seal or weatherstrip. Any other ideas?

Sent from my HTC One S using Tapatalk 2
 

SunlitComet

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you checked the seal under the back of hood mount on the firewall right?

other ideas are a induction duct leak, if installed a cai may whistle sometimes sometimes if you also have a ported throttle body the the blade mode done.

this is whistling right not a squeak?
 

Donnie Yukonie

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Years ago I had a mechanic at a dealership tell me it could be just the "sound" of the vortec system working ,and that it was normal…. Yea
 
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Crowder99Yukon

Crowder99Yukon

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Yes it is a whistle. And I did check that seal. Have checked every seal I can find on the front of this truck
 

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