bmo201656

I’ve got a 2017 Silverado with the V6. I noticed the other day that the radiator fan was still running after I turned truck off and got out. Since then I’ve noticed that here and there, as well as the temp getting up to ~240 degrees before regulating back to 210 (averaged). Thermostat was replaced in September and no problems with it since then. Anything else ring a bell on what could be happening?