Squealing from A/C compressor - lubrication? - JeepForum.com
 
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post #1 of 13 Old 06-13-2008, 09:31 PM Thread Starter
irish44j
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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.


1990 XJ 2-door
Rack on the roof, rust on the floor, 31s on the wheels, and five speeds on the stick.....
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post #2 of 13 Old 06-13-2008, 09:40 PM
tangofox007
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Does it make a difference whether the compressor is engaged or not?
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post #3 of 13 Old 06-13-2008, 10:27 PM Thread Starter
irish44j
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only happens when engaged.

1990 XJ 2-door
Rack on the roof, rust on the floor, 31s on the wheels, and five speeds on the stick.....
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post #4 of 13 Old 06-13-2008, 10:32 PM
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

AEKDB

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post #5 of 13 Old 06-13-2008, 10:39 PM
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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post #6 of 13 Old 06-13-2008, 11:21 PM
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?

AZ-Jeff
I don't own an XJ any longer, but I still think they are the best of all the Jeep products ever made. My XJ was my favorite vehicle in my 50+ years of driving.
So...I stick around and give advice.
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post #7 of 13 Old 06-14-2008, 06:42 AM
Veeb0rg
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when its squeeling, does your volt gauge drop?
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post #8 of 13 Old 06-14-2008, 06:50 AM
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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post #9 of 13 Old 06-14-2008, 12:23 PM
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.

"99 red cherokee sport/ 1" spacer lift/ 31" BFG a.t.'s/ 2" spacers/ Front Tow Hooks/ recovery straps/ Hi-lift jack/ hitch/
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post #10 of 13 Old 06-15-2008, 07:29 PM
creaky70
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Tighten the belt, the squealing will stop.
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post #11 of 13 Old 06-15-2008, 11:00 PM
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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post #12 of 13 Old 06-19-2010, 11:32 AM
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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post #13 of 13 Old 06-19-2010, 01:38 PM
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.

AZ-Jeff
I don't own an XJ any longer, but I still think they are the best of all the Jeep products ever made. My XJ was my favorite vehicle in my 50+ years of driving.
So...I stick around and give advice.
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