Cooling help?

Yeah that WP pulley looks to be mighty small, which means that if the lower is still original size, That WP is gonna be slamming the water through at a higher speed than Might be required.And if it gets to moving too fast,it may not pick up the heat. Or it may cavitate and destroy the pump. And you may not realize that has happened, cuz the only evidence is the rapidly climbing temp.gauge.
But if the lower pulley is properly sized to maintain the factory ratio, then you're good.
Manually operating the fan-controller is not a good idea. It is ok to have a manual over-ride, but the automatic mode should remain operational.Running the engine too cool is not a good thing either. Not good for power,or economy,nor engine life.