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The water pump on the 2.2L 5s-fe engine is driven by the timing belt on this car.
After you get the timing belt and covers off the engine there are simply a few 10mm bolts that hold the pump to the block, you need to remove the lower radiator hose from the theremostat housing that attaches to the pump and then remove the 2 10mm nuts that holds the pump to the corss over tube above where the oil filter is located.
This is a rathere involved job on this car and takes an experienced mechanic several hours to accomplish.