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Along with the radiator, the water pump serves as the focal point of the cooling system. Without its vital contribution, there would be no water/coolant flow through the engine. And we all know what that means– total meltdown! In fact, the water pump acts as the instigator in the system, immediately initiating the flow of coolant when the motor is fired up. The impeller inside the pump draws in coolant via the lower radiator hose and pushes it through two passages into the engine block. Once inside the block, the coolant circulates around each of the cylinders on both sides,