To remove the water pump on 4-Cylinder engines, first disconnect the cable from the negative battery terminal and drain the cooling system. Remove the drive belt, air intake duct, air filter housing, and the exhaust manifold heat shield. Drain excess coolant from the water pump housing and remove the lower radiator hose. On 2004 models, remove the thermostat housing pipe bolt from the front of the engine block and disconnect the ECT harness connector. Detach the heater hoses and remove the thermostat housing mounting bolts, then separate the thermostat housing from the engine block and water pump. Remove the water pump access cover from the engine front cover. Loosen the right front wheel lug nuts, raise the vehicle, and support it securely on jackstands. Remove the right front wheel and fender splash shield. Install a special holding tool onto the water pump sprocket to prevent movement and remove the water pump pulley bolts and the bolts attaching the water pump to the engine block. Clean the bolt threads and threaded holes in the engine and remove any corrosion or sealant, as well as old gasket material. For installation, install a new sealing ring into the groove in the pump and use a guide pin to align the water pump sprocket with the water pump during installation. Tighten the water pump mounting bolts and sprocket bolts to the specified torque. Install the water pump access cover and the thermostat housing and water pipe, lubricating the seal with silicone gel before installation. Complete the remaining installation steps and refill the cooling system, checking for leaks after operating the engine.