What is this high pitched sound coming from right side of the engine?

[ChaosInbound]

I thought it was the AC Compressor but I removed it and bypassed it. I removed the belt and the sound went away. Could it be the power steering pump? It is not audible during low rps and only is heard in higher rpms. I don't always hear it always as well. The engine needs to heat up for me to hear it sometimes. It is a 97 C1500

Here is a video of the sound.

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[SUBURBAN5]

To me. Alternator

 

[grampadirt]

I'd say a tensioner pulley or idler pulley.

 

[GoToGuy]

Sounds like , most likely a pump noise, can you feel the vibration on the pump body? Get a stethoscope, or long screwdriver, to hold on suspected item , put handle to ear , listen for offending whinny object. Use your brain , don't get caught in moving things!

 

[Pinger]

Air travelling fast through a narrow gap can create a screaming sound. PCV valve all OK?

 

[Schurkey]

Not likely a vacuum leak if the noise goes away when the belt is removed.

I'd be checking each pulley/accessory, AND verifying that the tensioner isn't out of it's expected angular-motion range.

Which reminds me...my '88 K1500 tensioner has issues, and it's way out of it's range, so I probably need a belt, too.

 

[jd33173]

To me. Alternator

Yep, sounds like it to me. Battery charging well? Un plug alternator and see what happens (make sure none of the cables find ground) might be an iffy rectifier complaining. Next guess is ps pump, make sure its not low on fluid but i feel like that is a lower freq sound.