A hose is a possibility. You need to locate that leak to know for sure. if it is in an area hard to get too especially when hot, there is a tool you can use to help. Coolant System Pressure Tester can be rented at most parts stores. With this you can apply pressure to the system with it still cold. Helps alot in tight areas. Just start at where you can see the water dripping and work your way up to the source.