2011 Quadra-lift air compressor cycling - Jeep Garage - Jeep Forum

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Old 02-01-2015, 11:48 PM
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2011 Quadra-lift air compressor cycling

Would like some input... I had one of the rear uni-body bolts break and long story short, the dealership had to remove the nitrogen from the QL system. I have noticed lately every cold morning I can hear the air compressor in the passenger front wheel area turn on...for 15 or so seconds, then hear a "pschhh"...like a blow off valve when it cuts off...then cycles again. I do not get any error codes, but am alarmed by how much the compressor stays on. My questions are this...typically does the dealership charge the system back up with nitrogen after they have released it, or would they let the onboard air compressor do all the work? Is there a proper way to do a leak test that I can perform...soapy water sprayed where accessible, or does it have to be at a dealership with a computer? I am no engineer, but I am concerned about the moisture and dust and dirt that gets sucked into the system, and from my experience with air compressors...the short life. I can't seem to find much info about these systems other than some complaints. I understand that the outside air is typically 78% nitrogen, but don't know if that is what it originally in the system or not. I will take it back to the dealership and let them look at it, but I am really looking for someone who knows these systems. Thanks!!!

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Old 02-02-2015, 10:10 AM
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Re: 2011 Quadra-lift air compressor cycling

QL is a sealed system. If you are not getting any codes, you probably are not having an issue with the QL. You might be hearing the automatic controls for the HVAC.
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Old 02-02-2015, 06:21 PM
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Re: 2011 Quadra-lift air compressor cycling

That's what I initially though, but have read posts that the system will pull in air if the system becomes low with its nitrogen fill...unless that is inaccurate. I do hear the compressor in the front passenger side engaging. There is a compressor in there according to the mopar parts list...but perhaps it engages only to level the vehicle.
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Old 02-02-2015, 10:03 PM
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Re: 2011 Quadra-lift air compressor cycling

The system does have an inlet for make-up air if needed. Below is a schematic of the QL system.
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Old 02-03-2015, 09:13 AM
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Re: 2011 Quadra-lift air compressor cycling

Rich_mac:

Where did you get this diagram??

It will be helpful in my trouble shooting.... thank you!
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