How do you replace the thermostat on a Fiat bravo?

To replace the thermostat on a Fiat Bravo, first, ensure the engine is cool and disconnect the battery. Drain the coolant and remove any components obstructing access to the thermostat, such as the air intake or hoses. Unscrew the thermostat housing, take out the old thermostat, and clean the mating surfaces. Install the new thermostat, reassemble everything, refill the coolant, and reconnect the battery.