So I have an early 2014 Sierra AT 5.3L, 113,000 miles. Had the condenser go about a month ago, and after getting a ~$1200 estimate I decided to hold off on what to do for a while(In Michigan here so the heat has been tolerable). The parts were on back-order as well.
One day I randomly started chatting on the GMC main site with one of the chat service people. Gave them the background of the issue, my truck info ,etc and they contacted my dealer. I believe a case number was opened at this time that became the dealerships responsibility. The dealer called me the next day and had most of the info, but I further explained the issue to them and gave them my mileage. They did just get the condensers in as well. The dealership (I believe the service manager) had to check if GM was offering any cost assistance for this issue, so he checked some system and called me right back to confirm that they were. All in all they said it'd cost me $275, which did end up to be the final total. I dropped my truck off the next evening and they had the condenser replaced/recharged and the steering recall done by noon the next day. Pretty happy with the cost and speed(once they had the part) of this resolution, especially now that I'm out of warranty..