Whistling sound under the hood?

[Crowder99Yukon]

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.

 

[Crowder99Yukon]

Bump

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[Donnie Yukonie]

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

 

[Crowder99Yukon]

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

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[SunlitComet]

weather seal or window seal leaks most likely.

 

[Crowder99Yukon]

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

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[SunlitComet]

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]

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

 

[SunlitComet]

 

[Crowder99Yukon]

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

 

[SunlitComet]

how about brake booster and related hose issues.

 

[Crowder99Yukon]

Could be but I really don't see how I could check. The truck has to be moving to recreate the noise.

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[Goodinblack]

...

 

[SunlitComet]

any chance i a brake wear sensor is making this noise?

 

[Crowder99Yukon]

Definitely not.

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