Re: 2011 GC limited-A/C not cooling
Same symptoms my '14 GC exhibited. Service tech discovered a problem with the evaporator.
Tech had to remove the entire dash panel to replace the evaporator. He somehow got it all back together; no rattles or squeaks!
A few panels had chips and dings that happened during the process. The service manager happily ordered - and had a tech replace the damaged panels. The work was performed under warranty.
Those plastic panels are very brittle and easy to damage so be sure to make a thorough post-service inspection.
You might want to take some detailed interior photos beforehand if your vehicle has to go through what mine did.
Hope it is a simple fix and does not involve anything major.