How do you install a replacement coolant temperature sensor on a 1985 Cadillac Coupe Deville with 4.1 engine?

To install a replacement coolant temperature sensor on a 1985 Cadillac Coupe DeVille with a 4.1 engine, first ensure the engine is cool and disconnect the negative battery terminal. Locate the coolant temperature sensor, which is typically near the thermostat housing, and unscrew it using a socket or wrench. Install the new sensor by screwing it in place and reconnect any wiring or connectors. Finally, reconnect the battery and check for leaks or any warning lights before starting the engine.