The water pump has 2 seals. If the rear seal leaks the coolant goes into the engine. If the front seal leaks it goes on the ground. It is possible to replace the water pump with the engine in the car. Take the passenger side wheel and the inner splash shield off to make it easier. Replace the timing chains, guides and oil pump while you are in there. Use the Motorcraft water pump and Melling timing kit and oil pump. Change spark plugs while you are at it and depending on the mileage consider the coils on the rear bank. You might also consider upgrading to the later style double row chain.
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