I posted this to a new thread but wanted to post it here as it's relevant to the discussion. My AC is night and day difference, but one year and one battery change later. Still not sure what is what, but no more sweating in the cab with the AC on!
I just wanted to let people know of my experience with my 2019 Big Horn. I had the poor AC that couldn't keep up with even California heat, let alone AZ or humid Deep South heat. So, when the TSB came out, I had them complete it even though I knew they had to tear apart the dash and that concerned me a lot. After I got the truck back in June of last year, I went through the summer and felt that if there was an improvement, it was like a 5-10% improvement and there were still times even on long trips where it would not get the cab cold enough while driving. If the sun came through the window, it definitely wasn't cold enough. Fast forward to this year and the summer heat. Even on the hottest days this year it's blowing ice cold. I can't explain it, but it's either a blend door opening and closing more fully, or it took time for the coolant and oils in the compressor to move through the system but in any event, it will FREEZE us out of the cab now. Weird and unexplainable unless I want to tear apart the dash again but hey, it's better. Hopefully some of you that have had the TSB completed experienced the same. The ONLY thing that I've done to my truck after the TSB was to replace the battery. As that is a process, maybe the solenoid that moves the blend door is working better with the new juice. In any event, I'm happy, cool, and feel it was worth it.