it's running too hot if in fact it's that hot .... start at finding out what your temp guage means when it sez 250, compare with a good thermometer in the rad, or preferably onea the laser thermometers so you don't have to open the rad, check at both sides of the thermostat housing and top/bottom of the rad, see if you have flow and are getting cooling, the gauges on these ol trucks don't always tell the tale
Bill
