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Old 04-04-2008, 11:56 PM   #1
Rayme
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Default Let's talk about that AC idler pulley

Since I bought my car in december..5 months ago, I always had that whine
which you can hear very nicely here(dont mind the rumble sound, that was fixed) : http://www.youtube.com/watch?v=Ofz0zqp9rY8
Sounds like a supercharger eh? I learned recently it was not normal...I thought it was just how the engine sounds (From outside the car it's very loud).

I took a screwdriver to my hear and listened around the pulleys..the AC idle pulley is obnoxiously loud compared to the AC condenser, crank and alternator pulleys. So I think I found the problem? Does the sound in my video sound like that tiny pulley bearing screaming?

I'm going to replace it, do I need something else than number 3? (maybe number 4?)



..or I thought maybe it's the alternator? how should I proceed, take out a belt at a time and see what happens?
Thanks for the input
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Old 04-07-2008, 12:23 AM   #2
wobbletop
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#3 went on mine. It's fairly common since it's exposed to the weather and not really protected. I think I had to replace #5 as well since #3 had completely broken and the belt was wearing away at it.
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Old 04-07-2008, 10:49 AM   #3
ttatsumi
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How much do the parts go for? Do I just disassmble and put it back or is there a specific steps to do this? Torque specs? Thanks
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Old 04-07-2008, 12:22 PM   #4
Rayme
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its about 26$
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Old 04-07-2008, 01:46 PM   #5
foch
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Take the belt off and start the engine. See if the sound is still there.
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Old 04-11-2008, 10:04 AM   #6
SAINTSOFSPEED
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I had a similiar problem with #5. It's an easy fix, but make sure you installed 3/4/5/6 without the belt in place. I had a rough time doing the opposite. I can provide instructions when I leave work this afternoon.
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Old 04-11-2008, 12:51 PM   #7
my scoop eats babies
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That's definitely your idler pulley. I replaced the pulley and both belts when I did mine, I think the parts were about 50 bucks and it took less than an hour.

I'm not sure if you can get away with replacing just the pulley or if the belts were contributing to the noise, I just replaced the belts while I was at it cause they looked crappy.
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Old 05-30-2008, 12:53 PM   #8
strohausii
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My #3 just impaled itself upon #6.
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Old 06-04-2008, 05:41 PM   #9
Shmeebaru
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Default #3

I had that same noise a while back, now I dont have a/c lol!
#3 into timing cover
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Old 09-26-2008, 05:48 PM   #10
Rally Punx
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filing for later use
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Old 01-08-2009, 10:46 AM   #11
AndyH
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Yup, I've got this whining sound on my '05 STi (with 41,000 miles), started maybe a month or two ago. I'll have to try removing the AC belt and see if the noise goes away. I hope it's just the idler pulley and not the AC compressor clutch as I'm assuming that would be a more $$$ repair.
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Old 01-08-2009, 12:30 PM   #12
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I had a very similiar sound on my 04 wrx. I don't need A/C in the winter so I just removed the belt, but my A/C was not coming on so I'm assuming it's the clutch.
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Old 01-08-2009, 02:29 PM   #13
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Quote:
Originally Posted by timmah View Post
I had a very similiar sound on my 04 wrx. I don't need A/C in the winter so I just removed the belt, but my A/C was not coming on so I'm assuming it's the clutch.
Perhaps...but doesn't the car prevent the AC from coming on below a certain ambient temperature (like say 32F)?

I've tried to turn my AC on recently...the light comes on indicating that it's 'on', but I'm not sensing that the compressor is engaged (usually I can tell via a very slight engagement sound, and a slight dip in the RPM's). Granted it's been below 32F for longer than I can remember so perhaps I have to wait until warmer weather to know for sure.
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Old 01-08-2009, 02:47 PM   #14
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BTW, according to my subaru dealership, the clutch and compressor are sold as one, and the list price is right around $650.

Yikes!
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Old 01-08-2009, 02:48 PM   #15
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Quote:
Originally Posted by AndyH View Post
Perhaps...but doesn't the car prevent the AC from coming on below a certain ambient temperature (like say 32F)?

I've tried to turn my AC on recently...the light comes on indicating that it's 'on', but I'm not sensing that the compressor is engaged (usually I can tell via a very slight engagement sound, and a slight dip in the RPM's). Granted it's been below 32F for longer than I can remember so perhaps I have to wait until warmer weather to know for sure.
I'm not really sure, I don't think that's been the case for me. I stopped noticing the lack of RPM dip and the periodic cooling fan noise missing when the whirring started, though.
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Old 01-08-2009, 05:55 PM   #16
Scav1180
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Rcv'ed my idler pulley today, was making noises and what from the original one. installing once I get home. if that dont solve the problem then im stumped.
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Old 01-08-2009, 09:53 PM   #17
AndyH
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Quote:
Originally Posted by timmah View Post
BTW, according to my subaru dealership, the clutch and compressor are sold as one, and the list price is right around $650.

Yikes!
Oh man, that's what I was afraid of
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Old 01-08-2009, 10:26 PM   #18
WRaholicX
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Where did you find that pulley for $26, I keep seeing them for $50?
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Old 01-08-2009, 10:26 PM   #19
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well installed the pulley but broke the adjuster.. LOL

so took a/c belt off until adjuster comes in.

the old pulley was making noises when I spun it manually. The new one was nice and quiet and smooth.

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Old 01-08-2009, 10:27 PM   #20
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Quote:
Originally Posted by WRaholicX View Post
Where did you find that pulley for $26, I keep seeing them for $50?
subarugenuineparts.com

https://www.trademotion.com/partloca...04&catalogid=2
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Old 01-08-2009, 10:33 PM   #21
WRaholicX
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Awesome, thanks
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Old 01-09-2009, 12:40 AM   #22
Coati
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#3 went on my wagon about a year or so ago. It was an easy job replacing it, but IIRC there were warnings in some threads about overtightening some parts when reinstalling.
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Old 01-09-2009, 01:49 AM   #23
DC16A2
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My AC idler pulley went too a few months ago..
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Old 03-26-2009, 12:25 AM   #24
2Lively
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How do I remove 4 from 3? just take a mallet to it? Does it unscrew some how?

Thanks guys...I busted 5 (same way as everyone else) and figured i'd replace the pully and the belts at the same time...

Joe
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Old 03-26-2009, 02:32 AM   #25
rick-l
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Quote:
Originally Posted by 2Lively View Post
How do I remove 4 from 3? just take a mallet to it? Does it unscrew some how?

Thanks guys...I busted 5 (same way as everyone else) and figured i'd replace the pully and the belts at the same time...

Joe
There is a nut that is not shown in the above picture. Just take it off

http://opposedforces.com/parts/impre...te/compressor/

Tighten it back up to 16.6 ft-lbs

It is just a shielded 6012 (??) bearing with a plastic pulley molded on it. I think its position in the front of the engine with the air forcing dirt and moisture in it doesn't do it any good.
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