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To see if the water pump is circulating you can remove the radiator cap while the engine is cool. Start the truck. when the trucks thermostat opens you should be able to look down in the radiator and see the water moving through it. But before you do that look at the weep hole on the pump and look for water marks. If you are not loosing water this is probably not the problem but if you are slowly loosing water you could be loosing it through this weep hole that is supposed to start leaking when your pump bearings go out. Another check is to remove the belts and try and wiggle the pump shaft if you have play it is probably worn out. Stepping up to a four core radiator would help but to do that you need to get four new radiator mounting brackets also since the four core will not sit in the three core brackets. (Tried that, been there, was really peeved.) Something else that you might want to do is temporarily hook up a thermostat that gives you an actual temp reading. That way you can compare it to what your thermostat is. It could be a simple matter of a worn out gauge if it has pegged before it could have damaged the copper windings in the meter.
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