1999 Grand Prix 3.8 engine non super charged and there is anitfreeze leaking out of the car on the passenger side The water pump has been changed what might it be?

could be a number of things if the leak is inside of the car it is your heater core. if it is outsidt the car under the hood it could be one of your hoses the water pump a freeze plug could be a head gasket or maybe even an intake gasket hard to say without actually seeing the car i wold pressure test the cooling system and see if you can find the leak that way