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To change the coolant temperature sensor on your 1998 Grand Marquis, first, ensure the engine is cool and disconnect the negative battery terminal. Locate the sensor, which is typically found near the thermostat housing on the engine block. Remove the electrical connector, then unscrew the old sensor using a socket wrench. Install the new sensor, reconnect the electrical connector, and restore the battery connection before checking for leaks and ensuring proper operation.

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