How do you change the thermostat in my 207 peugeot?

To change the thermostat in a 2007 Peugeot, first, ensure the engine is cool and disconnect the battery. Drain the coolant and remove the hoses connected to the thermostat housing. Unscrew the housing, replace the old thermostat with a new one, and reassemble everything by reversing the process. Finally, refill the coolant and check for any leaks before reconnecting the battery.