Has the temperature compensation board been removed from this car's cluster?? That would be the first suspect in the symptoms you refer to.
Art has provided instructions for the procedure: https://cleanflametrap.com/tempFaker.html
EDIT: That Nissan radiator will be good for years to come if it is only five years old.
I am of the opinion that HEPU water pumps score high on both quality and price when searching for a replacement. However, I suggest the first thing you do in your case is remove the temperature compensation board.
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Any twenty minute job is just a broken bolt away from a three day ordeal
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