The thermostat valve opening temperature is 89°С, the temperature of the valve full opening is 101°С. Thermostat valve travel 7.5 mm. The pressure in the cooling system is 1.2 bar. The cooling system uses one 3-pin sensor, two of which are used to transmit information about the temperature of the coolant to the injection computer, and one for display in the instrument cluster. The injection computer controls the following depending on the coolant temperature:
- injection systems;
- engine cooling fan relay;
- signal lamp of the emergency temperature of the coolant, ignited at a temperature exceeding 118°C. The radiator fan is turned on by the fuel injection ECU at low speed if the coolant temperature exceeds 99°C, and turns off when it cools below 96°C. The high fan speed is switched on when the liquid temperature reaches 102°С, the high speed is switched off when the temperature is less than 98°С.
After the ignition is switched off, the injection computer enters control mode. If the coolant temperature exceeds 103°C within 5 minutes after the engine has stopped, the engine cooling fan low speed relay is energized. If the coolant temperature drops below 100°C, the fan relay is deactivated (fan operation time cannot exceed 12 minutes).