I have a 1995 Subaru Legacy L s/w and replaced the A/C belt last summer after replacing the power steering pump. Ever since then, the A/C belt has squealed either when turning on the A/C or driving after it's on. It usually only lasts for 10 - 20 seconds, although there are times when it just won't stop and I have to go without A/C for a little while. As the squeal goes away, it sounds like a belt noise fading out, however, I know it could be something else entirely. The belt is tight so it's not a loose belt thing, but I don't know what else it could be. Any ideas?
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A/C belt squeals when turning on and off A/C or accelerating
Posted 03 September 2013 - 06:41 PM
Just how tight is the belt though? like how much play is in it? There is also a torque spec for it as well
Posted 03 September 2013 - 06:43 PM
I've seen this before, sometimes it doesn't matter if you replace the belt it may squeal a little, but not for that long. Another thing you should look at is the A/C pulley, when the compressor bearings wear out they will slow down the pulley's rotation, but since the engine will not stop for that it will force the belt to slip on the pulley's surface. Take the belt off and check if that stops the noise, if it does you found your problem. Hope this can be of help.
Posted 03 September 2013 - 08:47 PM
Belt needs to be replaced, now glazed, and adjusted correctly.
Posted 05 September 2013 - 08:22 PM
Luko, Okamakai, and john in KY,
The belt is pretty tight, maybe 1/2" total play. I didn't check for torque speck though. I guess I'm still old school. I'll try replacing the belt first and while I have it off I'll see if the A/C unit still squeals.
Thanks for all of the suggestions!
Posted 05 September 2013 - 09:56 PM
Had exactly the same whine in my 2001 forester. Turned out to be the AC idler pully, also needed to repair the tensioner mount.
Posted 05 September 2013 - 10:56 PM
Posted 13 September 2013 - 12:07 PM
Sometimes the a/c compressor clutch will squeal for a moment when it kicks in but usually I don't think it would be a continuous squealing.
Posted 13 September 2013 - 10:27 PM
Belt is slipping, check the idler pully assembly. not unusual for them to go bad when they are this old.
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