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Unread 06-13-2008, 10:31 PM   #1
irish44j
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1990 XJ Cherokee 
 
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Squealing from A/C compressor - lubrication?

I've been getting a loud screeching from my AC compressor. It's quiet when idling, but give the engine some revs and the compressor starts squealing. It's not the belt (which is pretty new and at correct tightness), it's the compressor itself.

Now, I know that my AC needs a recharge as the viewglass is "foamy" (though it still blows cold) - is this the cause of the screeching? Otherwise, is it maybe in need of somekind of lubrication that can be done without taking the AC system apart?

thoughts welcome.

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Unread 06-13-2008, 10:40 PM   #2
tangofox007
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Does it make a difference whether the compressor is engaged or not?
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Unread 06-13-2008, 11:27 PM   #3
irish44j
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only happens when engaged.
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Unread 06-13-2008, 11:32 PM   #4
eflores
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throw some dubya d on the belt ....see if it stops.....if it does your belt is too tight or too lose
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Unread 06-13-2008, 11:39 PM   #5
highlander179
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this usually happens to me when I start up with the ac on. basically, I turn off the ac until I get going up to speed, then kick it back on and the squeal is gone.
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Unread 06-14-2008, 12:21 AM   #6
AZ Jeff
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Quote:
Originally Posted by irish44j View Post
I've been getting a loud screeching from my AC compressor. It's quiet when idling, but give the engine some revs and the compressor starts squealing. It's not the belt (which is pretty new and at correct tightness), it's the compressor itself.

Now, I know that my AC needs a recharge as the viewglass is "foamy" (though it still blows cold) - is this the cause of the screeching? Otherwise, is it maybe in need of somekind of lubrication that can be done without taking the AC system apart?

thoughts welcome.
I am willing to bet the issue is insufficient belt tension. Compressor load on the belt increases as compressor speed increases, so the propensity for the belt to slip/squeal will increase.

Most guys who own 4.0 XJ's GROSSLY overestimate the REAL tension on the belt, and when they think it's tight enough, it's not even close to factory spec. Have you tensioned the belt with a GUAGE, or just "eyeball/finger" testing it?
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Unread 06-14-2008, 07:42 AM   #7
Veeb0rg
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when its squeeling, does your volt gauge drop?
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Unread 06-14-2008, 07:50 AM   #8
tangofox007
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Quote:
Originally Posted by irish44j View Post
only happens when engaged.
In as much as you described the noise as "loud screeching," it could be that your clutch is slipping. That typically occurs in conjunction with sudden rpm changes. You can see that happening if you watch the clutch face while making sudden throttle movements.
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Unread 06-14-2008, 01:23 PM   #9
99cherokeexj
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yeah i had the same problem with my jeep for a long time, until recently when i tightened it the squeeling stopped. Try to tighten the belt, mine hasn't squeeled since.
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Unread 06-15-2008, 08:29 PM   #10
creaky70
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Tighten the belt, the squealing will stop.
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Unread 06-16-2008, 12:00 AM   #11
Croyle00XJ
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?

You know I thought mine was squeeling too....I thought for sure it was the compressor making my belt squeel....and my belt was pretty new too....It ended up being my Alternator slowly seizing up on me untill it finally stopped moving and tore the living crap out of my belt.
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Unread 06-19-2010, 12:32 PM   #12
drglass
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Quote:
Originally Posted by Veeb0rg View Post
when its squeeling, does your volt gauge drop?
This is what happens to me. What does it mean if the volt gauge drops when the squealing starts?

If I turn on my AC it will squeal, not all the time, but most of the time. If i accelerate then it will squeal like a bi$%H and the voltage drops?

Is that the belt tightness or the clutch of the A/C compressor?
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Unread 06-19-2010, 02:38 PM   #13
AZ Jeff
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Quote:
Originally Posted by drglass View Post
This is what happens to me. What does it mean if the volt gauge drops when the squealing starts?

If I turn on my AC it will squeal, not all the time, but most of the time. If i accelerate then it will squeal like a bi$%H and the voltage drops?

Is that the belt tightness or the clutch of the A/C compressor?
The belt is slipping on both the compressor AND the alternator, thus causing voltage drop.
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