I have a 2015 Tahoe LTZ I bought used a few months ago. Clearly it is out of warranty but I have had it to the dealer FOUR times and even contacted Chevrolet. They did replace the heat module on driver side but still barely gets warm on high even after 30 minutes. Dealer/ Chevrolet say they "work as designed". All my other GMC and my husband's GMC and Chevys, including a 2015 seats got really hot. So, nothing the dealer or Chevy will do. My question is, can you purchase NON GMC part and replace what is in this vehicle to make the seats get hot ? If I have on a jacket, I can't feel one iota of heat. VERY frustrating as I paid a nice chunk of change. p.s. My husband's 2016 Silverado gets super hot. The day I drove it, it was over 100 degrees and I had the seats on. They were hot, wasn't thinking about the outside temp. Live and learn.