I have a 2014 Silverado 1500 LTZ Z71 with heated and cooled seats. The seats barely get warm on high. My last 7 vehicles have had heated seats that all worked fine. My wife's 2012 Impala LTZ will run you out if you leave it on high. I just got on this forum to see if I was the only one having problems. 3,500 miles and ready to take it in for service and have the seats checked. Quiet, firm ride, great handling truck.