My mother in law got a 2007 Yukon xl and I’m trying to get her in complete working order. I’ve donated a couple things from my totaled girl that I kept from September. Her rear hvac controls do nothing. She has manual controls up front, but the rear is automatic, but doesn’t do anything. Doesn’t show anything, even when pressing the RSE controls. Is it “common” for these to go out? The fuse inside is good and everything’s connected. Thanks guys!! attached is a picture of her girl, next to mine. Makes me REALLLLY miss my Yukon!