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Replacng a Bad Pulley

Old March 21st, 2019, 8:18 AM
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Default Replacng a Bad Pulley

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!
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Old March 21st, 2019, 9:36 AM
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can you turn the ac on? if so does the noise (im guessing) stop?
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Old March 21st, 2019, 9:43 AM
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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.
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Old March 21st, 2019, 10:41 AM
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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.
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Old April 14th, 2019, 8:54 PM
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it would be helpful if we knew what you have .
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Old April 15th, 2019, 2:10 AM
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Originally Posted by devon99 View Post
it would be helpful if we knew what you have .
Silverado & Fullsize Pick-ups > 2014 - 2018 (GMT-K2) according to the forum.
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Old April 15th, 2019, 11:03 AM
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very funny ! can you tell me what size motor is in it ?
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Old April 15th, 2019, 9:32 PM
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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.
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Old April 15th, 2019, 10:59 PM
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Originally Posted by devon99 View Post
very funny ! can you tell me what size motor is in it ?
Its a 2014 Chevy Silverado LTZ, 5.3 Liter engine.
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