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the cooler should be enough to keep the fluid temprature in limits .
for that first you have to know the flow and required BTU (BY EVALUATING THE temprature rise ,external temprature ,flow rate )
the quality depends on the thermal exchange ,flow(water ,air,reffregrant ) motor pump etc
coolant means prevent or decease heating in system so ineed to know some prameterse to select a good coolant such as peak load of this stystem the value of it - flow rate -max pressure after i know this is prameters i start to choose the system of coolant for example slected filtter is very importanent-slected diameters of pipes and there areanother parmeters i should take it in mind