How do you change thermostat on fiat brava?

To change the thermostat on a Fiat Brava, first ensure the engine is cool, then disconnect the battery. Remove the coolant hose connected to the thermostat housing, unbolt the housing, and take out the old thermostat. Clean the mounting surface, install the new thermostat with the correct orientation, reattach the housing and hoses, and refill the cooling system with coolant. Finally, reconnect the battery and check for leaks after starting the engine.