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Unread 05-02-2012, 11:10 AM   #1
mjj1587
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2002 KJ Liberty 
 
Join Date: Jun 2011
Location: Grand Rapids, MI
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A/C Compressor Replacement opinions

Hey guys!
Wondering if I can get some opinions. I am replacing the AC Compressor in my wife's KJ as the weather here in MI is going to be getting warmer soon. The compressor in and of itself is not bad - the pulley bearings blew out last fall and I just bypassed for the winter as AC is obviously not needed in the cold. At any rate, even when the bearings blew out, the AC still worked fine.. it just made a terrible grinding metal sound as the pulley spun (the cap for the bearing blew off and the balls were grinding up). That being said I have some options:

I can: Purchase a complete replacement kit including: Compressor, Condensor, and Orifice tube (actually the whole line) for just under $400... then probably around $100 for an evac and refill/charge of the system.

-or-

I can: Call my buddy who is friends with the owner of a dealership who can get me a new compressor for $200 cash...

I am thinking that since I know there is no internal damage to the existing compressor (meaning there's no particles in the closed system) could I just do a quick disconnect and reconnect of the AC lines from the old compressor to the new one and leave the existing condensor and orifice tube? That would save me close to $200. The KJ has 165k miles on her... what are some thoughts on these options?

Thanks guys!

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Unread 05-02-2012, 07:34 PM   #2
tjkj2002
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Ifyou do not replace the other parts any warranty on the compressor is voided.You must show proof of the reciever/dryer and orfice tube being replaced at the same time as the compressor to keep the warranty.
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Unread 05-02-2012, 08:01 PM   #3
streetglideok
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Quote:
Originally Posted by tjkj2002 View Post
Ifyou do not replace the other parts any warranty on the compressor is voided.You must show proof of the reciever/dryer and orfice tube being replaced at the same time as the compressor to keep the warranty.
Yep exactly that. Best to go thru the system and fix it right. Another thing, the clutch bearings usually fail alongside an impending compressor kaboom.
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Unread 05-03-2012, 09:22 AM   #4
mjj1587
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Ok cool! Glad I asked - I am aware that 99% of compressor warranties are only valid when replacing the receiver/dryer & orifice tube, but was willing to forfeit that for the cheaper fix...at any rate, I'm not a mechanic and only know enough to really get by so it's good to have honest opinions from others. I appreciate it guys!
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Unread 05-03-2012, 09:37 AM   #5
tjkj2002
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Yeah doing it right is expensive but with the quaility of remaned/aftermarket compressors of late you want that warranty.
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Unread 05-12-2012, 07:33 PM   #6
gjinc
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I got a new pulley bearing from auto zone
MT2021
http://www.autozone.com/autozone/par...7233_235847_0_
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Unread 05-12-2012, 07:39 PM   #7
streetglideok
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Quote:
Originally Posted by gjinc View Post
I got a new pulley bearing from auto zone
MT2021
http://www.autozone.com/autozone/par...7233_235847_0_
I have a distinct feeling you are going to find out theres more wrong then what you think. Give it a few days or weeks with the a/c running.
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Unread 05-12-2012, 07:43 PM   #8
gjinc
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Quote:
Originally Posted by streetglideok View Post
I have a distinct feeling you are going to find out theres more wrong then what you think. Give it a few days or weeks with the a/c running.
Been working great, no problems
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Unread 05-12-2012, 08:20 PM   #9
streetglideok
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Some can back me up on this when I say, the vast majority of compressor pulley bearing failures were tied to an overheating compressor/impending kaboom compressor that I have seen. You may have the odd one, but only time will tell.
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Unread 05-12-2012, 08:44 PM   #10
gjinc
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compressor is working good, pressures are where they should be. Air is cold
i have done this on other vehicles with no trouble and I don't expect any on this one. Already has a few thousand miles on it

I've also replaced compressors, flushed systems, and replaced orifices when necessary. It was not necessary this time.

Sometimes it is just a bearing and sometimes its not.

Thanks
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Unread 07-06-2012, 06:27 AM   #11
cemcclain
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Hi, I'm getting ready to replace the A/C compressor in my jeep. This is the first time doing this and I am a little confused about the parts available.

I've ordered the compressor, accumulator, and fluid line (which advance auto's website id's as the expansion valve). Do these seem like the only parts needed?
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Unread 07-06-2012, 07:51 AM   #12
streetglideok
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Pag oil, and in reality a flush to clean out to the best of your abilities, the condenser and evaporator. From there, you will need a shop to evac and charge the system. You'll also need to find out, if the compressor is filled with oil, or shipped dry. Normally there is a tag on the unit to verify this. Next, you'll need total oil capacity for the system.
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Unread 07-06-2012, 07:30 PM   #13
cemcclain
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Thanks!

Do you have any idea what the time frame needs to be between completing the part installations and getting the refrigerant pumped in?
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Unread 07-06-2012, 08:07 PM   #14
streetglideok
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ASAP. Longer the accumulator is exposed to air, the more likely it will become contaminated by moisture. Soon as you are done with the work, it needs to be evacuated and charged.
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Unread 07-21-2012, 12:07 PM   #15
cemcclain
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The parts all finally came in so I can replace the A/C components. After reviewing the Haynes manual and looking over the system I have a couple of questions:

1. Is there a good order to replace the compressor, fluid line and accumulator in? I was planning to pull one part at a time and install it's replacement.

2. If the compressor comes with oil in it do I add more oil? If yes, how much? I can't find a reference for how much to add.

3. Were else do I add oil and how much?

4. Do I only use the flush on the condenser and evaporator?

Last edited by cemcclain; 07-21-2012 at 02:34 PM..
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