Kolbert1922

Hello all, I am also having this same issue with my 2017 Sierra with the 6.2. I have gotten both the radiator and the thermostat replaced and it still continues to fluctuate up and down, above 210. I’m not what I should check next. I had a 2014 with the 5.3 and it always sat a little below the 210 mark and never moved from there. Just trying to see what the next step should be. So irritating!