So I went to the bank today and decided to take the highway which I rarely do since the TBSS is my daily it's mostly stop and go from me to my job. When I leave the bank the truck flashed the engine coolant hot message. So I decide to pull over and let it cool off. After the truck cools off I start it and drive home with the heater on full blast. I replaced the thermostat. I replaced the coolant as well. So after all of that I decided to start it and let it run until it got to the middle of the temp gauge. After it got to normal operating temp I drove it about 4 miles and it started to get hotter and hotter but I kicked on the heater for about 10 seconds and it cools it back down. Once I turn off the heater it starts to over heat again any help would be great! Thanks!