Water pumps can leak from 2 different places; the shaft seal or the water pump gasket. If the water pump bearings are starting to wear out they will allow the shaft to wobble and coolant will leak out. If the gasket fails either from age or damage from dirty coolant you will see a leak where the water pump bolts to the block or timing cover. The water pump on the 2007 Ford Edge with the Duratec 35 V6 engine is located INSIDE of the engine housing. To reach, you'll have to remove the master belt, wheels, and remove the timing chain...