all these are good suggestions, and if none of them pan out, or you have an IR temp gun to check the temps, you may find that trucks this young experience clogging of a percentage of the radiator tubes so that while there is circulation, there is not enough to keep water in the rad long enough for it to cool off. you may also find when you do start with the water pump that while the pump seals are good, the blades on the pump maybe rusted away and not pushing much water.
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