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Unread 02-08-2016, 08:34 AM   #1
bobelang
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Squeaky AC Pulley

For a little while now, I would hear this obnoxious squeaking when I turned the engine over, and it would last for 3-10 seconds, or until I took my foot off the clutch and/or brake after starting my Jeep up.

I finally got around to trying to diagnose this using the "squirt bottle" technique, and I believe it's isolated to the AC compressor pulley. I didn't actually take the belt off, but it appears to be aligned well enough from what I can tell, and it doesn't appear too worn or cracked. Plus, I cranked the AC and watched the pulley turn over, at which point the annoying squeak came back.

As of right now it's not the end of the world because it's cold and I'm not planning on using the AC, plus the squeak stops soon after it turns over, but I don't want it to get worse when the summer comes around and I start to use it more.

So that being the case, what are my options as far as replacing this pulley/bearing? From what I've seen it's not really easy, so I'm not sure it's something that I could do myself. Am I even calling the parts by their appropriate name? My AC still blows really cold, so as far as I know the compressor itself is in good shape. It's just that the pulley that runs along the belt is slowly driving me crazy. Any advise/options are welcomed.
Thanks!

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Unread 02-08-2016, 07:17 PM   #2
Knuckelhead
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Have you narrowed it down to the A/C clutch bearing that's spinning with the pulley when the compressor isn't engaged?...
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Unread 02-09-2016, 07:42 AM   #3
bobelang
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Quote:
Originally Posted by Knuckelhead View Post
Have you narrowed it down to the A/C clutch bearing that's spinning with the pulley when the compressor isn't engaged?...
See, that's what I'm not sure about, because I don't think I'm familiar enough with the whole serpentine belt assembly to really know what all I'm looking at.(got this Jeep about a year and a half ago and I've been slowly teaching myself everything, but still a little novice in most areas)

From what I can tell by cross referencing this pulley to the diagrams that I can find, it says it's the AC pulley, but I've seen other things about the clutch pulley but still don't quite understand which is what. It could very well be the clutch pulley though.
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Unread 02-09-2016, 01:37 PM   #4
NotURMailman
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Clutch pulley and AC pulley are the same thing.
Neither is technically correct.
It is the compressor pulley. It uses a clutch so that the compressor doesn't turn when the AC compressor is not requested.
Does the noise go away when you turn the AC on?
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Unread 02-09-2016, 03:50 PM   #5
bobelang
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Quote:
Originally Posted by NotURMailman View Post
Clutch pulley and AC pulley are the same thing.
Neither is technically correct.
It is the compressor pulley. It uses a clutch so that the compressor doesn't turn when the AC compressor is not requested.
Does the noise go away when you turn the AC on?
Alright that's sorta what I thought but I couldn't tell if they were the same thing or not.

But it doesn't change a lot when I turn the A/C on which is weird. I hear it the most when I start my Jeep up, and it squeals for about 5-10 seconds. It'll either stop on it's own or when I take my foot off the brake/clutch and put in neutral.

It definitely sounds like it's coming from that area though. And I think I remember just watching the pulley turn then stop, at which point I would hear a feint squeal again. It's starting to get to the point now where I can sometimes hear a quiet, rhythmic squeak from that area, even when the AC isn't on.

I'm gonna be working on something unrelated tomorrow on my Jeep so I'll test it out again with the AC and see if that changes anything.
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Unread 02-09-2016, 03:54 PM   #6
bobelang
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Additionally, and maybe this is really stupid of me, but I've been having the defroster/heat on recently. I just read some other posts that running the heat/defroster could run the AC clutch as well, and 've been running it practically all the time, especially on start up, because it's been so cold. Not sure if this could be exacerbating my problem here.
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Unread 02-09-2016, 04:49 PM   #7
jkp
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Remove the belt, and you can spin the pulley by hand to see if it makes a noise or if the bearing is rough.
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Unread 02-09-2016, 08:48 PM   #8
Knuckelhead
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Quote:
Originally Posted by bobelang View Post
Additionally, and maybe this is really stupid of me, but I've been having the defroster/heat on recently. I just read some other posts that running the heat/defroster could run the AC clutch as well, and 've been running it practically all the time, especially on start up, because it's been so cold. Not sure if this could be exacerbating my problem here.
Some reading for you, also read the attached link within:

http://www.jeepforum.com/forum/f9/c-guys-1058168/

... HTH
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Unread 02-11-2016, 08:03 AM   #9
bobelang
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Quote:
Originally Posted by Knuckelhead View Post
Some reading for you, also read the attached link within:

http://www.jeepforum.com/forum/f9/c-guys-1058168/

... HTH
That definitely answers that question. That actually seems like a relatively easy mod. I may have to attempt this one day. Thanks a lot for the link.
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