How do you change citroen c3 thermostate?

To change the thermostat on a Citroen C3, first, ensure the engine is cool and disconnect the battery. Drain the coolant from the radiator and remove the necessary components to access the thermostat housing, typically located near the engine block. Remove the old thermostat, clean the mating surfaces, and install the new thermostat with a new gasket. Reassemble everything, refill the coolant, and check for leaks before starting the engine.