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.