Cooling System Description and Operation (1.8L LUW and LWE): Thermostat
Thermostat controls the flow of coolant and is mounted to the cylinder head. The thermostat contains a wax pellet (7) that expands and contracts based on the coolant temperature, which will mechanically move the main spring and a sealing disc to control the flow of coolant. It is assisted by electric power in order to open the main valve earlier than original opening temperature. The thermostat will begins to open electrically at 90°C (194°F) under full load condition and will begins to open mechanically at 105°C (221°F) under part load condition. It will be fully opened at 120°C (248°F).