The water pump uses centrifugal force to
send fluid to the outside while it spins, causing fluid to
be drawn from the center continuously. The inlet to the pump
is located near the center so that fluid returning from the
radiator hits the pump vanes.
The pump vanes fling the fluid to the
outside of the pump, where it can enter the engine.
The fluid leaving the pump flows first
through the engine block and cylinder head, then into the
radiator and finally back to the pump.