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Old 07-08-2015, 11:55 AM
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Refilling AC compressor

This may be a basic question, but I replaced the compressor on my 2012 JKU and need to refill the compressor. Is this something the dealer needs to do or can I just buy a couple cans of AC refrigerant and fill it up?

Thanks in advance!

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Old 07-08-2015, 12:48 PM   #2
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you need to pull a vacuum on the system to remove all air and moisture and then you can fill it with refrigerant. On one of the labels under the hood or on the compressor itself it should show how many Oz to fill the system.

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Old 07-08-2015, 01:26 PM   #3
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You need to have a shop with the proper equipment take care of it. The system also needs a lubricating oil. Shops spend a few thousand on specific equipment because an auto A/C system needs to be properly evacuated, filled and lubricated, under pressure.
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Old 07-08-2015, 02:04 PM
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Thanks guys!
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Old 07-08-2015, 02:10 PM   #5
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Originally Posted by kik View Post
You need to have a shop with the proper equipment take care of it. The system also needs a lubricating oil. Shops spend a few thousand on specific equipment because an auto A/C system needs to be properly evacuated, filled and lubricated, under pressure.
X2.

Plus there are hefty hefty fines for allowing refrigerant into the atmosphere knowingly.

Here in Canada an individual can be fined up to $250 000 I think it is. And a business is over $1million I believe.

My numbers maybe off bit. But it's huge. Been 3yrs since I took my ODP course(ozone depletion course) for automotive.
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Old 07-09-2015, 10:21 AM   #6
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negative 134A has the oil in the refrigerant same with R-12 the only difference between the two is the oil in them for the seals in the compressor.
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Old 07-09-2015, 10:25 AM   #7
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X2.

Plus there are hefty hefty fines for allowing refrigerant into the atmosphere knowingly.

Here in Canada an individual can be fined up to $250 000 I think it is. And a business is over $1million I believe.

My numbers maybe off bit. But it's huge. Been 3yrs since I took my ODP course(ozone depletion course) for automotive.
Key word is knowingly, nominal amounts are unavoidable, but cutting a line full of refrigerant is a big problem. Im not sure on the numbers but as serious as it is im sure your close. OP's system isn't charge so theres no pressure gauges will help with the charge but depending on the amount needed you can usually get pretty close.
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Old 07-09-2015, 10:35 AM   #8
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negative 134A has the oil in the refrigerant same with R-12 the only difference between the two is the oil in them for the seals in the compressor.
Let me rephrase. the cans you will buy at walmart will say "2 oz lubricant" you can buy some without oil apparently, I don't know why you would but its an option. with the system fully evacuated (vacuum) all you have to do is add the correct amount of Freon and oil which is already mixed. again the manufacturer will specify type and amount of everything.
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Old 07-09-2015, 10:51 AM   #9
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The cans of refrigerant over the counter in a parts store should only be used to top off an auto A/C system, which is only putting a band aide on the problem. If a parts store refrigerant can has to be used that means that there's a leak in the system and it needs to be repaired. Refrigerant cans are a waste of cash and effort but good for the companies that manufacture them because if someone has to use them they'll always have to use them. The leak just doesn't stop. On a dry system or recently repaired system it has to be evacuated, tested and filled under pressure. Manifold gauges must be used. Shops use and pay a lot of cash for the proper evacuation and fill equipment for a reason. On a dry/repaired system the proper amount of lubricating oil has to be added. Too much or too little will cause a problem and possibly cause a new compressor to fail. Only using the proper equipment will take care of that.
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Old 07-09-2015, 11:04 AM   #10
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You make it sound so complicated, I guess go to a shop and have them do it.
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Old 07-09-2015, 11:06 AM   #11
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Originally Posted by kik View Post
the cans of refrigerant over the counter in a parts store should only be used to top off an auto a/c system, which is only putting a band aide on the problem. If a parts store refrigerant can has to be used that means that there's a leak in the system and it needs to be repaired. Refrigerant cans are a waste of cash and effort but good for the companies that manufacture them because if someone has to use them they'll always have to use them. The leak just doesn't stop. On a dry system or recently repaired system it has to be evacuated, tested and filled under pressure. Manifold gauges must be used. Shops use and pay a lot of cash for the proper evacuation and fill equipment for a reason. On a dry/repaired system the proper amount of lubricating oil has to be added. Too much or too little will cause a problem and possibly cause a new compressor to fail. Only using the proper equipment will take care of that.
do not ever use the cans to top off a system!! They have a set amount of oil in them, you may not have lost that set amount, it will ruin the entire system.
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Old 07-09-2015, 02:35 PM   #12
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do not ever use the cans to top off a system!! They have a set amount of oil in them, you may not have lost that set amount, it will ruin the entire system.
I agree. That's what some of them are advertised as but shouldn't be used. Unfortunately, many use them to "top off" their systems if their A/C seems to not be blowing cold enough. There are even some TV commercials that advertise this, which the product shouldn't be used if someone cares about properly taking care of their A/C system. The correct equipment has to be used; manifold gauges, evacuation of any residual refrigerant and especially moisture under vacuum, inspection, lubrication and fill under the proper pressure. If that's complicated then I guess it is. An auto A/C system should never be filled any other way.
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Old 07-09-2015, 02:54 PM   #13
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I agree. That's what some of them are advertised as but shouldn't be used. Unfortunately, many use them to "top off" their systems if their A/C seems to not be blowing cold enough. There are even some TV commercials that advertise this, which the product shouldn't be used if someone cares about properly taking care of their A/C system. The correct equipment has to be used; manifold gauges, evacuation of any residual refrigerant and especially moisture under vacuum, inspection, lubrication and fill under the proper pressure. If that's complicated then I guess it is. An auto A/C system should never be filled any other way.
Its too dang expensive replacing an a/c system. we have an a/c company so I have access to gauges vacuums and 134a, hell even r12 if I needed it, we don't service vehicles but I took a class by ac delco in dallas for a few days on car a/c and its not all that different from the units we put in homes on a regular basis. its easy for me but sometimes I forget not everyone shares my experiences. Most shops wont carry multiple types of oil they use one oil in all cars or one of the two, but theres more then two types and your manufacturer will require a certain type. basically no one does literally every aspect of a/c right in vehicles, so there's pros and cons to both sides. that machine the shop uses pulls a vacuum tests the system then refills or charges the system. I'd be surprised if I saw them pull the system off then put your type of oil shot in the system, they use the same premade stuff you can buy, well 134a anyways you cant buy 12 without a license. If you want to do this right find the manufacturers recommended oil, fill with Freon then add the oil recommended, you can buy it in the same pressurized cans for easy installation. make sure the Freon is oil free if adding your own oil. shops usually have kids who took a 4 hour class on the a/c machine so this is good for you to know to confirm with them.


lol this thread just got way to intense for some cold air
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Old 07-09-2015, 03:10 PM   #14
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Can a cheapie $100, single stage, rotary vacuum pump pull enough vacuum?
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Old 07-09-2015, 03:18 PM   #15
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Its too dang expensive replacing an a/c system. we have an a/c company so I have access to gauges vacuums and 134a, hell even r12 if I needed it, we don't service vehicles but I took a class by ac delco in dallas for a few days on car a/c and its not all that different from the units we put in homes on a regular basis. its easy for me but sometimes I forget not everyone shares my experiences. Most shops wont carry multiple types of oil they use one oil in all cars or one of the two, but theres more then two types and your manufacturer will require a certain type. basically no one does literally every aspect of a/c right in vehicles, so there's pros and cons to both sides. that machine the shop uses pulls a vacuum tests the system then refills or charges the system. I'd be surprised if I saw them pull the system off then put your type of oil shot in the system, they use the same premade stuff you can buy, well 134a anyways you cant buy 12 without a license. If you want to do this right find the manufacturers recommended oil, fill with Freon then add the oil recommended, you can buy it in the same pressurized cans for easy installation. make sure the Freon is oil free if adding your own oil. shops usually have kids who took a 4 hour class on the a/c machine so this is good for you to know to confirm with them.


lol this thread just got way to intense for some cold air
I knew you did it right. You use manifold gauges, the proper lubricant and refrigerant. Not many have access to that equipment and can't properly evacuate and fill the system. The point I'm trying to make is that you can't just pick up a few cans of refrigerant from your local parts store and have at it. The gauges must be used along with vacuum and the proper materials like I believe you also mentioned. Not having the equipment and possibly knowledge to go along with it, ultimately it becomes more cost effective for a qualified shop to take care of it. Especially since if the compressor subsequently tanks, it might be on them.
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Old 07-09-2015, 04:00 PM   #16
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Can a cheapie $100, single stage, rotary vacuum pump pull enough vacuum?
Atmospheric pressure is 14.7 lbs/square inch, vacuum by definition is anything lower then atmospheric. Biggest part is you need gauges to determine you have pulled enough vacuum, it needs to be 0. also need a tank that can hold everything your pulling out, and keep in mind not every vacuum pump can handle the oils in the refrigerant so you can ruin the pump. Me and @kik agree the $100 fee for a shop to do it is the best option unless fully equipped to do it right
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Old 07-10-2015, 12:14 AM
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This thread blew up! Lots of good info in here. It's probably best to have my dealer take care if it. I was quoted $140/$150 for them to do it.
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Old 07-10-2015, 06:33 AM   #18
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This thread blew up! Lots of good info in here. It's probably best to have my dealer take care if it. I was quoted $140/$150 for them to do it.
This happens a lot. All with good intentions. At least you know not to just dump a few cans of refrigerant in your system and fry your new compressor.
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Old 07-10-2015, 06:54 AM   #19
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wow I was expecting that to be a boring thread.. I do my own stuff on my cars and have roughly 250 or so invested in equipment for doing it. Your jeep is pretty new still and you really shouldnt have any issues anytime soon so not really worth the investment. I take care of quite a few cars for my family and when the AC went out on 2 of them at the same time I went and bought the gauges and pumps.
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Old 07-10-2015, 11:54 AM
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This happens a lot. All with good intentions. At least you know not to just dump a few cans of refrigerant in your system and fry your new compressor.
haha yea, I don't feel like replacing the compressor again.

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