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Unread 07-25-2013, 09:07 PM   #1
sting7785
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1998 XJ Cherokee 
 
Join Date: Feb 2012
Location: Irmo, SC
Posts: 22
Should the compressor be doing this?

I have a 1998 XJ 4.0L Cherokee and I was changing the serpentine belt when I noticed something. I'm not sure if it's supposed to be this way or not. On the AC compressor, the part that the belt is touching (pink arrow) spins constantly as the belt moves. The part in the middle of that (blue arrow) spins for about 3-4 seconds, then stops for 3-4 seconds, and repeats this process. There's a click sound every time it starts to spin. The AC on this Jeep blows, but it's not cold air at all. I'm not sure if this is something that should be normal behavior for the particular part, or if that's an issue. Any input is greatly appreciated. Thank you.

Edit: I apologize for the small image. The site kept making me decrease the size for the upload. ><

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Unread 07-25-2013, 09:12 PM   #2
B52dude
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1999 TJ Wrangler 
 
Join Date: Oct 2010
Posts: 346
Yes, that is normal. The compressor is just cycling on and off. The blue arrow is an electronic clutch. My 99 TJ does the same thing. But it has icy air.

Edit: To answer the second part of the question, you probably have a leak in the system and have lost pressure, thus no cold air.
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Unread 07-25-2013, 09:22 PM   #3
79chiefs
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It means your r134 level is low. If it does cycle the clutch it means you have some 134 in it, just get a can and add some. You can get a charge kit most anywhere.
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Unread 07-25-2013, 09:46 PM   #4
djb383
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Hummm, after our a/c overhaul, the compressor seldom cycles off......and it's cold.
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Unread 07-25-2013, 09:49 PM   #5
Holder350
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1995 XJ Cherokee 
 
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Probably low on charge. I would take it to someone with a set of gauges to check actual pressures on the system.

Cycling the clutch like that is hard on it and the compressor. I would try to get it looked at soon.

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Unread 07-26-2013, 07:50 AM   #6
79chiefs
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Quote:
Originally Posted by djb383 View Post
Hummm, after our a/c overhaul, the compressor seldom cycles off......and it's cold.
The compressor should cycle on and off. It is normal, but not every few seconds. If it does not cycle, or cycles every few seconds it means it is low on charge.
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