How do you replace a thermostat on a Suzuki Esteem 1.6 liter?

To replace the thermostat on a Suzuki Esteem 1.6 liter, start by ensuring the engine is cool and disconnect the negative battery cable. Drain the coolant from the radiator and remove the upper radiator hose connected to the thermostat housing. Unscrew the thermostat housing, remove the old thermostat, and clean the mating surfaces before installing the new thermostat with a new gasket. Finally, reassemble by reversing the steps, refill the coolant, and check for leaks.