Music Junkie

Hey all:

I have a pulley (at least I am 90% sure it is) that is going bad. When idling, it is barely noticeable. When under load, and at about 2,000rpm, it is quite obnoxious.... I used a stethoscope and believe I have it narrowed down to the AC pump pulley. My question is if I have to replace the entire pump, or if I can just replace the pulley? I did a little google search, but have not come up with great info yet. I am hoping someone here has dealt with this and will know.

Thanks!

Irish_alley

can you turn the ac on? if so does the noise (im guessing) stop?

Music Junkie

Yes, I can turn it on, and no, it does not stop. It might have actually become a little more noticeable at idle. You really have to listen closely to hear it at idle. The main problem is when I am accelerating at around 2,000rpm. It is a loud squeal/chirp (not sure how to describe it precisely). It stops the instant I let off of the gas.

Irish_alley

i would eliminate the ac then. when its off the clutch should be the only thing turning and when on the whole clutch assembly should be turning.

devon99

it would be helpful if we knew what you have .

oilcanhenry

Silverado & Fullsize Pick-ups > 2014 - 2018 (GMT-K2) according to the forum.

devon99

very funny ! can you tell me what size motor is in it ?

devon99

you may need a alternator decoupler pulley. it needs special tools to change it out. gates #91024. it free wheels at idle and engages as you throttle up.

https://www.gates.com/us/en/ymm/sear...t-number=91024
click on the link for more information.

Music Junkie

Its a 2014 Chevy Silverado LTZ, 5.3 Liter engine.