Overheated tonight: Related to prior issue?

Read up on water pumps and pulleys and compare to what you have. As I recall discussions here, people were confused why the water pump for AC cars had more blades than non-AC cars. Wouldn't they want the best water flow for both, and what is the cost of 2 more blades? The conclusion was that the difference was not because AC cars need more cooling (though they do), but that they have a different diameter pulley on the water pump,(smaller?) so the pump spins at a different speed (faster?) and might cavitate at high rpm. Your symptoms suggest that could be your problem.