| For it to cool it must be in the radiator and the longer it is in the radiator with cool air passing over it the cooler the liquid would get. If it flows through too quickly, i.e. past maximum rate of efficiently cooling, it would not be in the radiator long enough to get as cool as if it was in the radiator longer. My explanation is not the best but think you get the point. Think about those instant hot water heaters, if you pass the water through too quickly it takes it much longer to heat up. Converse I would think, i.e. cooling, would also be true. Plus since part of the purpose of coolant is to draw heat out of the block, etc. there is a maximum efficiency point to where it must be in contact to get the greatest amount of heat out of the block and transferred into the water. Too fast and it the water is not in the block long enough to transfer the heat at the maximum efficiency. Of course much of this may be moot if driven for long periods though I would bet there is still a maximum for efficiency.
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