Hi - new to this forum. We have a 2015 Yukon SLT that has had issues almost from day 1 with the recirculate button not functioning. We’ve had it in two different dealerships and neither have been able to correct the issue for longer than a day or two after we get the car back from the shop. We’ve been told that the computer “isn’t throwing off any codes”, which was translated into English for me, meaning the system is functioning as it’s supposed to. We get all outside odors whether or not the recirculate button is in use or not. Anyone here have same/similar issues that have been successfully addressed/repaired? Thanks in advance for any helpful info.