If the water pump is the original then @160K I'd replace that as well. Don't run the engine too long with just water cooling because doing so isn't good for the water pump bearings since the coolant also serves as a lubricant. Now if you do decide to replace the water pump then leave the old one installed during the water flush if you plan to run the engine.
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1999 Pontiac Grand AM SE - 3500 Swap
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