Overheating when sitting

I have a 2010 Silverado, 4.8l 4l60-e. When I sit at a stoplight or somewhere for a couple minutes the truck starts to overheat fast. I have to crank the heat on and once I start moving it goes back down. My radiator fans will not come on. I’ve changed thermostat, and the temperature sensor on side of motor. If I unplug the sensor the fans turn on and sound like the trucks gonna take off flying lol. When I plug it back in they still run fast as hell. But other than that they won’t turn on/off by themselves. Any information/help is appreciated.