The 1947 - Present Chevrolet & GMC Truck Message Board Network - Squeak or whistle inside when starting or shutting down

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IT Cowboy

02-09-2025 07:43 PM

Squeak or whistle inside when starting or shutting down

It is coming from in side and it makes a distinct whistle type squeak in the same pattern. I think it is from the HVAC system and possibly the blend door closing, It is not a belt and it does it on startup and on shutdown

Rust_never_sleeps

02-10-2025 07:39 PM

Re: Squeak or whistle inside when starting or shutting down

1 Attachment(s)

vac lines to the flapper, and to the control panel

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