I'd say as a general rule, you leave the water pump alone until it starts leaking. If it has a belt connected to it and it's turning and not leaking, it's pumping. If you've taken the thermostat out and you're still overheating, you probably need a new radiator. Heating and cooling a radiator bends the vanes where they are attached to the tubes over and over like bending a coat hanger back and forth...eventually they break loose, and that leads to loss of cooling power. They can also get clogged up inside. If you have a radiator shop nearby they might be able to "boil it out" and repair it for you, but it's hard for them to compete against overseas labor, so you might find that a new radiator is your best option.
While you have it off, you might want to clean out the cooling channels inside the block.
Could be something else, but that's my guess.
Jim
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