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The port on top of the water pump (or on the side in some applications) is the coolant intake for the pump which coincides with the lower radiator hose. some people hook a heater hose to the intake and to the pump but doing this you are recirculating hot water from the heater core back into the engine as the water pump pushes water from front to back coming through the intake and out the upper radiator hose. so in this instance already hot water is going to the heater core and straight back to the engine without being circulated through the radiator also your water pump is essentially getting water from two sources. i normally plug the water pump and run a hose to the radiator and to the intake. there isn't anything wrong either way. one hose from intake to heater core and the second hose from the heater core to either water pump or radiator. one will take longer for the heater core to heat up but will ensure on a hot summer day all the coolant in the system is being cooled. with pump to intake setup the heater will work faster on a cold day but you may have cooling or overheating issues on a hot summer day.
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