2012 4.3L MPI Making a squeaky whistling noise

Amir10

Cadet
Joined
Sep 17, 2018
Messages
11
Just noticed the other day when I fired up the motor in the driveway that it was making this squeaky-whistle? noise. See in short video attached. Could this be IAC valve going bad? The noise is definitely louder by the throttle body area. Or should I be looking for at the belt and pulleys?

Service Manual #32 points to a few things to look at including vacuum lead, bearings, IAC, belt, rubbing parts. Not sure where to start.

Enginge SN: 1A636747
 
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