Doyle King
Junior Member
Truck runs hot when pulling my boat up hills and in hilly terrain. Gauge will go from 12 o’clock to just over half way to the red line. New crate motor at 241,000. Now at 400,000. Never had a problem with new motor until a couple years ago. Temp ran normal until 330,000. I have replaced the heater core, water pump, thermostat, fan clutch and coolant bottle and radiator. It still runs hot under load.