So I just started having this issue a couple days ago it started out of no where. It doesn't start till I hit the gas and when that happens the radiator fans run full blast and it stays that way after a few minutes after I shut my truck off. I changed the coolant temp sensor yesterday thinking that was the issue from reading other people having the similar issue and it hasn't changed. I haven't changed the thermostat cause I haven't had an engine light on, but maybe that's why?
I have a 14' Sierra 1500 5.3