Cooling System Description and Operation (1.4L LUV): Thermostat
The Thermostat is a regular part of the Thermostat Housing (1). The thermostat controls coolant flowing. It is a grid controlled electronic wax pellet type. By coolant temperature and/or applying current, the wax-pellet of the thermostat is molten what leads to the opening of the thermostat. That allows the coolant to flow through the radiator. The electronic heating of the thermostat is controlled by the engine control unit. The thermostat begins to open with 0V at 103°C (217°F) and with 12V at 80°C (176°F). It is fully open at 117°C (243°F). Whether the thermostat opening is supported by the electronic heating or not depends on load conditions which are defined as parameters in the grid.