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Old 01-04-2009, 10:25 PM   #1
timmah
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Default whining noise that is affected by RPM

This started just yesterday...I have an 04 wrx, with about 92k on it. The noise sounds like a whining that increases in pitch as the engine RPM's increase. My first guess is that the A/C clutch is broken (as pushing the a/c button no longer causes a change in engine vacuum). Anyone ever have this problem?
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Old 01-05-2009, 06:05 AM   #2
xwtfbrendan
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Thats the turbo..


(lol)

Check all IC hoses / pipes / couplers?
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Old 01-05-2009, 08:09 AM   #3
timmah
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it's not the turbo, i'm not that much of a noob. it is almost certainly the A/C compressor. it sounds like supercharger whine. I was just wondering if anyone knows if the clutch is separate or the thing is sold as whole unit.

Last edited by timmah; 01-05-2009 at 10:30 AM.
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Old 01-05-2009, 03:21 PM   #4
xwtfbrendan
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Haha, I know. I was just playing.
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Old 01-05-2009, 03:22 PM   #5
Acrdys
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whining similar to your car in reverse?
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Old 01-05-2009, 03:39 PM   #6
timmah
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update: i just removed the belt to the a/c compressor and the sound is gone.
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Old 01-07-2009, 07:23 PM   #7
WRaholicX
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Hey, I just got the same exact sound, and I pinned it down to the AC compressor Clutch, however I haven't taken it apart to find the problem, does anyone know how to take the Compressor Clutch assembly apart?
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Old 01-07-2009, 07:41 PM   #8
rick-l
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How about that $35 pulley (AC tensioner)? Mine made that noise before I changed it.

Put a screwdriver on the bolt and the other end to your ear and it sounded rough.
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Old 01-07-2009, 08:15 PM   #9
WRaholicX
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No, it's not that, I put WD-40 on the AC clutch and the sound started to stop except at high RPM, it doesn't do it on startup anymore, but at around 3000 rpm it starts to sound like a supercharger. Thus, I'm almost positive it's the compressor clutch, do you know how to get lube down to the clutch bearing?
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Old 01-07-2009, 09:25 PM   #10
rick-l
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Does it sound like the you tube recording in this?

http://forums.nasioc.com/forums/show....php?t=1487622
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Old 01-08-2009, 04:17 AM   #11
WRaholicX
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That was very helpful, thanks. I'll probably try to pull the AC belt and see if the noise stops
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Old 03-07-2009, 05:23 PM   #12
timmah
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UPDATE: Swapped out the pulley, belt, etc, today, and the sound is gone and the a/c functions perfectly. So for anyone whose wrx sounds like it's superchargd: one of your pulleys went!
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Old 03-08-2009, 11:08 AM   #13
AndyH
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Thanks for the update. I am experiencing a similar whining noise that tracks with engine RPM in my '05 STi. I was hoping it was the idler pulley for the A/C belt. Took the belts off yesterday and drove around with the A/C belt off and the whining noise is still there.

So it appears that it's coming from either my alternator or power-steering pump. I can't determine which is making the noise so I'm not sure what I'm going to do at this point. I may just live with it until it gets worse and is easier to pinpoint. *sigh*
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Old 03-08-2009, 12:28 PM   #14
yarrgh
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use a stethoscope, i.e. - a long screwdriver held to your ear. That helps pinpoint noises.
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Old 03-08-2009, 01:29 PM   #15
AndyH
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Quote:
Originally Posted by yarrgh View Post
use a stethoscope, i.e. - a long screwdriver held to your ear. That helps pinpoint noises.
I should have mentioned that I did do that...both made noise at idle and while my wife slowly rev'd the engine for me. Thanks for the suggestion though.

Last edited by AndyH; 03-08-2009 at 10:21 PM.
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Old 03-08-2009, 08:17 PM   #16
z&cobb
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A stethoscope for about $10 can be used in more locations than a screwdriver.

There is a rubber hose that separates the probe from the head set ear phones. You can touch the probe it to a lot of other places where your head and the screw driver won't fit. The sound is amplified a lot when you put it on the source. For example near a bad alternator bearing.
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