LS a/c replacement - JKowners.com : Jeep Wrangler JK Forum
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post #1 of 13 Old 06-07-2017, 02:19 PM Thread Starter
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LS a/c replacement

Need to replace my LS a/c compressor and going to replace the jk condenser, drier and expansion valve at the same time. I lost the original compressor, don't know why but the clutch locked and melted on it.

Replaced it with a salvage unit, thinking the compressors where horrible high to find out they are only about $50 more from rockauto than what I paid for from the salvage yard. I did not replace anything else at that time and the a/c worked ok, not really cold. This one went out on me at the end of last summer, was leaking oil, refrigerant from some where at the compressor.

Now that it is getting hot again, I am getting a "new" compressor and all the components mentioned, just in case the other items are plugged or if the drier is to wet.

My main question is how much oil will this system take? Taking into account that the a/c lines are longer some extra will need to be applied. I just have no idea how much to even start with. Anybody have a good idea as to how much?

2007 JKU X, 6.0 ls and 6L80e with a diy kit from RpmExtreme, 4.10, 4" ProComp Stage 1 lift, AEV drop brackets, 325/65R18 Nitto Terra Grapplers, Eagle Offroad Alloys 18"x10"
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post #2 of 13 Old 06-10-2017, 04:13 PM Thread Starter
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So nobody has done this yet? I am now going to just change the compressor, drier and the expansion valve. Reading what I can find is making my head spin.

From what I have read is total capacity for the jeep system is 5 oz of oil and the gm takes 7.5 oz. Compressor comes with 8 oz. in it already. Guessing I need to remove about 2-3 oz. from it and then install to assume that would give me the total amount for the jeep system plus a little bit for loss and the longer hoses?

I guess?

2007 JKU X, 6.0 ls and 6L80e with a diy kit from RpmExtreme, 4.10, 4" ProComp Stage 1 lift, AEV drop brackets, 325/65R18 Nitto Terra Grapplers, Eagle Offroad Alloys 18"x10"
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post #3 of 13 Old 06-10-2017, 04:15 PM
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I just replaced my compressor today. Used the same size (Sanden 7176). The compressor I removed was a cheap knock off. I replaced it with a Holley (produced by Sanden from what I understand). To address your oil question... I think if you follow the recommendations in the manual, you'll be safe. According to Alldatadiy for a 2014 the condenser takes 2 oz, evaporator takes 2 oz, drier takes 1 oz, and compressor is whatever you drained from it. When I drained mine, that was close to 3/4 oz. I had another 1/2 oz run out of the line, so I put 1.25 oz back in the system.

As far as the refrigerant goes, I didn't weigh it. I didn't have a good weight reference since the lines are longer and the compressor is smaller. Rather than weight, I went by pressure. It was just over 90 degrees and I ended up with 30-35 on the low side and 275 on the high side. I'm not sure if that's perfect, but it blows cold enough. I don't think I over-filled and it seems good enough for now. I'm not an HVAC specialist, so you can take everything I typed with a grain of salt.
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post #4 of 13 Old 06-10-2017, 04:46 PM
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MOST* new compressors have an specific quantity of oil already in them. If you bought a reputable brand compressor it will for sure. You can usually find how much is already in the compressor on the product site or in accompanying literature. What you do is find out how much your system requires (I believe it is 5oz total) and then subtract whatever amount is already in the compressor and add that much into the system before charging. Yes the lines are longer on the LS swap but it is not enough to worry about changing the quantity of oil or refrigerant you will put in the system. Since your system will be open just put whatever the recommended charge of freon is in the system. I believe all models are 18oz of freon but double check that. Use whatever PAG weight oil the compressor wants not what the original system wanted.

Last edited by Dkjeep; 06-10-2017 at 04:49 PM.
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post #5 of 13 Old 06-10-2017, 08:34 PM Thread Starter
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Thanks guys for the help. I'll check the compressor tomorrow. Its stated that it has 8 oz in it but will check. If I understand right the evaporator, condenser and drier all take approximately 1 oz. each so I need 2 oz. in the compressor for a total of 5 oz. If I understand you correctly Dkjeep.

2007 JKU X, 6.0 ls and 6L80e with a diy kit from RpmExtreme, 4.10, 4" ProComp Stage 1 lift, AEV drop brackets, 325/65R18 Nitto Terra Grapplers, Eagle Offroad Alloys 18"x10"
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post #6 of 13 Old 06-11-2017, 12:38 PM
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Thanks guys for the help. I'll check the compressor tomorrow. Its stated that it has 8 oz in it but will check. If I understand right the evaporator, condenser and drier all take approximately 1 oz. each so I need 2 oz. in the compressor for a total of 5 oz. If I understand you correctly Dkjeep.

The entire system takes 5oz. If the compressor already has 8oz in it you need to dump and measure it and then add the 5oz back to the compressor. You then need to get the remaining oil out of the system. I would do a flush and change the dryer while its apart. This way you can rest asured you have the correct quantity of oil in the system. It will perform like SHIT if it has too much oil in it. Also be sure you draw a good vacuum on the system for a solid hour since you are doing so much. The let it sit for another half hour and make sure the vacuum stays on the system, this is an easy way to check for leaks.

You don't need to distribute specific quantities of oil to the separate components. Just make sure you add the most of it to the compressor and dump the rest in one of the lines before you close it up if the compressor wont hold it all.

Last edited by Dkjeep; 06-11-2017 at 12:40 PM.
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post #7 of 13 Old 06-20-2017, 02:26 PM Thread Starter
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Well this seems to be a failed attempt.

Replaced the compressor, expansion valve and drier. Put 2 oz. of oil in compressor, I don't thing I put to much oil in. Vacuumed the system.

Ended up with 55 on the low side and 250 on high side at 95 degrees ambient temp. Radiator fan is running and the air out of the vent is a balmy 80 degrees. Even driving down the highway it never gets very cool. Felt the condenser and drivers tube is warm to hot and the passenger side is cool.

I did not replace the condenser as everything was clean that I pulled out plus I never lost a compressor (shelled out).

Front of jeep is basically clear and no grill inserts, just the winch box located atop of the bumper next to grill drivers side.

Any ideas out there?

2007 JKU X, 6.0 ls and 6L80e with a diy kit from RpmExtreme, 4.10, 4" ProComp Stage 1 lift, AEV drop brackets, 325/65R18 Nitto Terra Grapplers, Eagle Offroad Alloys 18"x10"
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post #8 of 13 Old 06-20-2017, 02:34 PM
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Hmm.... did you flush the system? Is the cooler of the 2 lines going into the evaporator cool or COLD? It should be pretty chilly and sweating like a mad man. Otherwise the only thing I can think of is you have a partially stuck blend door or whatever seal is there is gone letting hot air from the heater core leak into your a/c vents.


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post #9 of 13 Old 06-20-2017, 03:14 PM Thread Starter
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Quote:
Originally Posted by Dkjeep View Post
Hmm.... did you flush the system? Is the cooler of the 2 lines going into the evaporator cool or COLD? It should be pretty chilly and sweating like a mad man. Otherwise the only thing I can think of is you have a partially stuck blend door or whatever seal is there is gone letting hot air from the heater core leak into your a/c vents.


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Large line (low side) is cool not cold and it is sweating. I did not flush the system. The small line (high side) is hot.

2007 JKU X, 6.0 ls and 6L80e with a diy kit from RpmExtreme, 4.10, 4" ProComp Stage 1 lift, AEV drop brackets, 325/65R18 Nitto Terra Grapplers, Eagle Offroad Alloys 18"x10"
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post #10 of 13 Old 06-20-2017, 03:19 PM
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I did not flush the system.

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post #11 of 13 Old 06-21-2017, 02:41 PM Thread Starter
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I know, I know. Will try again with the low pressure now at 42 and high at 225. With what I have seen and been told I may have been a bit high on both. So drop it a little bit and we will see what it will do. As of doing it still does not feel great but we will see.

2007 JKU X, 6.0 ls and 6L80e with a diy kit from RpmExtreme, 4.10, 4" ProComp Stage 1 lift, AEV drop brackets, 325/65R18 Nitto Terra Grapplers, Eagle Offroad Alloys 18"x10"
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post #12 of 13 Old 06-21-2017, 05:19 PM
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Originally Posted by 4wheels4life View Post
I know, I know. Will try again with the low pressure now at 42 and high at 225. With what I have seen and been told I may have been a bit high on both. So drop it a little bit and we will see what it will do. As of doing it still does not feel great but we will see.
Here is the thing, the system takes 18oz. That is 1 and a 1/2 cans of freon. Don't play around with reading the gauges, the slightest temp change can make them change wildly. Hell even your fan kicking on and off will affect it big time, if you are in direct sunlight will affect it, and on and on and on. What I am trying to say is that the pressures can be finicky, and trying to chase them doing it like you in a garage or driveway with rental/consumer grade equipment can be an exercise in frustration.

I am no pro just a guy who has done it a bunch of times on all kinds of vehicles in an environment similar to yours. Do you know how many cans you put in this go around?

IF you are lost on the charge at this point I would.....

Open the system and flush the condenser and evaporator, DONT run the flush through the compressor. put 1 and 1/2 cans of freon in it, and THEN read the gauges and observe performance.

Put a meat thermometer in one of the vents and turn the A/C on high recirc. You should be able to get a 134a system down into the low low 40's / high 30's
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post #13 of 13 Old 07-03-2017, 06:17 AM Thread Starter
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Hmm.... did you flush the system? Is the cooler of the 2 lines going into the evaporator cool or COLD? It should be pretty chilly and sweating like a mad man.
Yes and yes.

Flushed the system replaced with 5 oz. of oil and recharged. Much better.

Thanks again Dkjeep for your help.
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2007 JKU X, 6.0 ls and 6L80e with a diy kit from RpmExtreme, 4.10, 4" ProComp Stage 1 lift, AEV drop brackets, 325/65R18 Nitto Terra Grapplers, Eagle Offroad Alloys 18"x10"
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