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I discovered that the QL in this 2011 does not like the cold and does the same thing, the compressor never turns on and it just blinks the lights but doesn't actually lift the Jeep. For the first 9 months after I got it, the front shocks would slowly bleed down if it wasn't used daily. I thought that it was rather odd but wasn't exactly sure if it was normal or not but then it stopped doing it all on it's own. I saw the "Service Air Suspension System" EVIC message one time just recently but the QL seems to work fine and I haven't seen it since.
 

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The QL in my 2011 JGC is back to being dysfunctional now that the freezing weather has returned. The system must be contaminated with moisture as ColdCase suggested. The compressor comes on when the JGC is started and is noisy and vibrates. The front shocks appear to be completely deflated while the rear shocks look normal. The EVIC displays "Immediate Air Suspension Service/Repair Required". I'm going to pull the fuse until the weather warms up and I will replace the fuse after the QL system has had time to defrost to see if it still works. It's a faulty design if it takes in air to compensate for a small leak as that just masks the leak problem and leads to the system being contaminated which ends up ruining very expensive components. Sweet ride but this is easily the most trouble prone vehicle that I've ever had. It's just one thing after another which never seems to end.
 

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In the case of a leak, it's not a matter of if or may, the desiccant will eventually become saturated and this will allow the QL system to become contaminated with moisture which will ruin the system prematurely. As I said, taking in outside air to compensate for leaking nitrogen just masks the leak problem from the owner which delays the repair while it would be easier and less costly to fix. It's another faulty design, among the list of faulty design problems with the WK2 JGC. The system should have been a completely closed system with a pressure sensor that warns of a low pressure/leak problem that requires maintenance/repair.
 

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If the compressor is drawing outside air then there must be a leak so why not simply have the EVIC report low QL system pressure that requires maintenance/repair? It would be better to nip the problem in the bud while it's any easy fix and before the system is contaminated and the contamination ruins the obscenely expensive components. I don't see how a closed system would be more apt to leave you stranded than the current system. As it is right now the rear end of this JGC is up in the air while the front end looks like a low rider which is what happened with the OP that started this thread. I wonder if anyone has tried replacing the airline fittings on the air shocks with schrader valves and pressurized them manually in order to not have to deal with this bs or pay through the nose to have it repaired? There's no way in hell that I'm dumping thousands of dollars into this lemon when FCA never managed to resolve the stalling problem. This is the only vehicle that I've ever driven that stalls while you're driving it. Like I said, it's just one thing after another.
 

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jblakeman, when you said....

"By the way the service department told me they recharge all of their Jeeps with normal air....not nitrogen and they've never used nitrogen on any Quadra-Lift models"

What is the source of this "normal air"? Are the just using the shop's compressed air that they use to run their air tools? If so, that can't be good! They're supposed to be using Class 5 nitrogen (99.999% pure). It probably guarantees future work on those QL systems though.
 

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This thread and the other thread by JeepGC4me………

https://www.jeepforum.com/forum/f309/air-suspension-pressure-3566322/

don't exactly inspire confidence that the dealers will properly service the QL system when it's in need of repair so I, like many others before me in these forums, am looking into a way to at the very least get some nitrogen into the QL system. So I've sourced out the directions w/diagrams and also the specialty tools that are required, which are expensive if you have to buy them retail, as opposed to having a dealer discount. In order to do the job as prescribed you need a wiTECH scan tool w/software which is obscenely expensive. I don't know if the Launch X431 Pro system has the ability to handle this procedure or not.
 

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I would get that "normal air" out of there asap! If I was you I'd be livid and raising hell with Jeep's customer support! Your QL system with all of those brand new obscenely expensive components has been thoroughly contaminated with a complete refill with that ''normal air". I assume that they just used the shop's compressed air that they run their air tools with which when compared to class 5 nitrogen is filthy. Is this suspension drop normal or what? I wouldn't think so, but I'm not exactly sure. It seems to me that that would indicate some sort of leak even if it not an external leak to the atmosphere and is only an internal leak where the high pressure side of the system is bleeding pressure back into the low side of the system, it's still a leak.
 

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It went up into the forties today so I put the QL compressor fuse back in and fired the JGC up and the QL system appears to have gotten over the conniption fit that it had had with the brutally cold weather. No nasty vibration or squawking to be heard and it pumped the front end up to NRH without any error messages. I'm going to see if I can find any leaks in the system and see what I can do about flushing the system out and getting some new nitrogen into it. There's a 10247B Air Suspension Refill kit on ebay if anyone is interested but it only includes the long adapter and doesn't include the short adapter that is used to connect to the JGC QL nitrogen reservoir tank which is another $100 or so retail............

https://www.ebay.com/itm/153354885558

The auction ends at at 10:45 EST tonight.
 

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No I hadn't ColdCase, thanks for the heads up. That looks interesting, I just wish that it had a better display. They should make a bluetooth OBDII interface for it and port the code to OIS and Android so that you could run it on your smart phone or tablet. Of course they'd have to battle the hackers then which is probably why they haven't done it.
 

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jblakeman, the adapter that is used to fill the JGC QL nitrogen reservoir tank can be found here.........

https://www.moparessentialtools.com/...003&type=tools

and it is pictured in the attached file. It appears to just have a standard air tool air line quick coupler male fitting on it. I realize that there are different styles as we use one style for the oiled air lines for the air tools and another style for everything else but that fitting on that adapter looks like a standard air tool fitting to me.
 

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jblakeman, the point of using Class or Grade 5 Nitrogen is that it is dry and contains virtually NO moisture.......

"NI 5.0UH 5.0 Ultra High Purity 99.999 %*
O2 < 1 ppm
H2O < 3 ppm
THC < 0.5 ppm"

It has less than 3 parts per million of H2O, as in water. The problem with the QL system in the WK2 JGC, as discussed previously in this thread of yours, is that if there is any sort of leak, the system takes in atmosphere air to compensate for the lost nitrogen and along with the atmosphere air comes moisture. What really pisses me off is that there is no notification through the EVIC that the QL system is doing this so if you drive the vehicle daily you'll probably never notice that there is a problem until your moisture laden QL system freezes up or your compressor croaks from contamination and overuse because the system isn't up to pressure. The forum must have scrambled that link to the short adapter that is used to fill the JGC QL nitrogen reservoir tank because it's still works with my copy of that comment that I posted. Just do a search for the item number 2062703020 on that Mopar Essential Tools and Service Equipment page that the link in this forum brings you to. I took a look at the service valve on the QL nitrogen reservoir tank on this '11 JGC, which for some strange reason is on the passenger side, and it looks just like a service valve on the low pressure side of an R134a A/C system, which might be why the knob on that Mopar Short Adapter that is used to fill the JGC QL nitrogen reservoir tank is the color blue. I'm going to get out the vernier calipers to see if that is in fact what it is. To refill the QL system exactly as prescribed by the Factory Service Manual you would need a wiTECH scan tool but you might be able to get by with using the ScanGauge II vehicle system monitoring tool that is discussed in the thread that ColdCase linked to, as it reports QL system pressure. Either that, or just wing it and hope for the best. The QL system on this JGC is on borrowed time if the moisture isn't purged from the system asap and I don't trust the dealers to do the maintenance after what I've read in these forums. Even though the system still works, at least when the temperature is above freezing, they'd probably tell me that the compressor and control valve are shot and need to be replaced to the tune of thousands of dollars. That aint happening!
 

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I got the vernier calipers out and although it's a bit difficult to get to the service valve on the QL nitrogen reservoir tank to measure it, it does in fact appear to be the same service valve that is used on the low pressure side of an R134a A/C system. That must be why the knob on the Mopar short adapter that is used to fill the JGC QL nitrogen reservoir tank is the color blue. So that simplifies being able to put nitrogen into the QL system tremendously as those R134a quick release couplers are cheap. I called around in my search for a supplier for grade or class 5 nitrogen (99.999% pure) and every person that I spoke with said that you can just use industrial grade nitrogen(99.995% pure) which is cheap @ $15 for 60cft, the smallest cylinder that it comes in at the first distributor that I spoke with, that quoted a price. I had to explain to the salesman that the Factory Service Manual specs class or grade 5 nitrogen and emphasizes the point with bold text so he looked into the cost of Ultra High Purity(UHP) Grade 5 nitrogen and came back with a price of $75 for an 80 cft cylinder, the smallest size that it comes in there, which is almost four times as expensive as their industrial grade nitrogen. The whole QL system probably requires a couple cft to fill, at most, so you end up buying way more than you need, in any case. I called the local Airgas distributor and the girl I spoke with insisted that the only size that their UHP nitrogen comes in is a 300 cft cylinder, which I know isn't true but I didn't want to argue the point. It is cheaper per cft, at 50 cents a cft but you're buying 300 cft when you only need a couple and the high pressure steel cylinder is five foot tall and probably weighs more than I do. It was almost as if she was trying her best to not make a sale. I spoke with a salesman of a third local specialty gas distributor about two other types of grade 5 nitrogen that they sell other than UHP nitrogen, as the smallest cylinder that they produce of UHP is 200 cft. The two other types of grade 5 nitrogen are for specific applications and spec purity rates for other contents in the gas which I don't think is important as far as the QL system goes but they come in the smaller A3 size, which is a 31 cft aluminum cylinder, so I was hoping that it would be less expensive than buying the 80 cft cylinder of UHP from the first specialty gas distributor that I spoke with. The salesman from the third specialty gas distributor that I spoke with took my name and phone number and said that he'd look into it and would call me back with a price but he never did. I'm going to call again on Monday morning to get a price. There is some money to be made here if a specialty gas distributor would supply a small cylinder, such as a 20 cft bottle of UHP nitrogen as I expect that there would be a lot of interest from QL equipped JGC owners who would like to maintain the QL systems in their JGC without getting screwed over by the dealers.
 

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andyo5, yes I understand that, how else could you get 300 cft into a 9x55 inch tank? I haven't done the math but the JGC QL nitrogen reservoir tank is 10.6L which from what I've read, you have to fill twice to 175 psi to fill the QL system, so how much nitrogen is required? Am I incorrect in thinking that 300, 80, or even 60 cft is way too much and that a 20 cft cylinder, which is not even available, would a better choice? The smallest volume that I might be able to get is 31 cft, which would be a much better choice if it's proportionally the same or a little more expensive than the next available size, which is 80 cft. Am I wrong in thinking that most of it won't be used and will be wasted when I return the cylinder, no matter what I buy?
 

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Actually, that last comment of mine isn't entirely correct because the QL nitrogen reservoir tank pressure isn't going to drop to zero after filling the rear air shocks so it probably doesn't even require twice the volume of the QL nitrogen reservoir tank pressurized to 175 psi to completely fill the QL system with nitrogen.
 

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andyo5, in order to fill the QL nitrogen reservoir tank, you connect the Air Suspension Refill Tool 10247B, which is nothing more than an unadjustable gas regulator that is preset to 175 psi which has the proper quick connect adapter coupler connected to the hose, to the QL nitrogen reservoir tank. You open the on/off valve on the tool which pressurizes the QL nitrogen reservoir tank to 175 psi. You close the valve and use the scan tool to fill the rear air shocks one at a time. You then use the Air Suspension Refill Tool to pressurize the QL nitrogen reservoir tank again, close the valve, and fill the front air struts one at a time. You then use the scan tool to fine tune the QL system pressure by adding to/venting from the system so that it is within spec (188 - 216 bar-liters), but of course I won't be able to do it that way as I don't have access to a wiTECH scan tool. So according to your calculations, the first fill of the empty tank will require 4.45 cft and I expect that after the rear shocks are filled that the QL nitrogen reservoir tank will have residual pressure in it so the second fill will be some fraction of that 4.45 cft. It's more than the couple of cft that I had assumed but it's still a tiny fraction of the 80 cft that I may be forced to buy. So as I suspected, even a 20 cft cylinder of UHP nitrogen would be more than plenty for the job.
 

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jblakeman, you should find a different dealer and if you already have an Android device, do yourself a favor and get AlfaOBD.........

http://www.alfaobd.com/

and.......

https://play.google.com/store/apps/details?id=com.AlfaOBD.AlfaOBD

and if you need a scan tool this one is very popular among AlfaOBD users........

https://www.scantool.net/obdlink-mxbt/

and if you would also like IOS compatibility, an IOS compatible version is available for $10 more......

https://www.scantool.net/obdlink-mxp/

AlfaOBD will allow you to monitor the QL system in your JGC and will give you access to the procedures to maintain it. If I were you I wouldn't be using anything other than NRH until you get the QL system straightened out.
 
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