Look under the water pump,and see if it has a nipple coming out of it with a vent line attached to it...If it does,and that is the hose the coolants coming from,then I'd say the pump is history as the seal is leaking out the weep hole,and will increase once the engine temps rise increasing the pressure in the cooling system,and that is why you see it being expelled out the hose...If it is,replace the water pump,flush the cooling system thoroughly while the pumps off,replace with Honda approved coolant,or an aftermarket waterless coolant which combats heat much faster,and better...:icon_ devil: