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To locate and replace the cooling sensor on a 1999 Lexus GS 300, first, ensure the engine is cool and disconnect the negative battery terminal. The cooling sensor, also known as the coolant temperature sensor, is typically located near the thermostat housing on the engine. Carefully unplug the electrical connector, remove the sensor using a wrench, and replace it with a new one, ensuring a proper seal with any necessary O-rings. Finally, reconnect the electrical connector and the battery terminal, and check for leaks.

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