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The thermostat belongs to the cooling system of an internal combustion engine and has the function of closing the passage opening of the coolant from the engine block to the radiator, as long as the engine is cold (after start-up), so that it reaches the optimal operating temperature as quickly as possible, and of opening it to allow the coolant to pass to the radiator after the engine has reached the optimal operating temperature.
The optimal temperature of the coolant, which ensures maximum engine performance, efficient fuel consumption and reduced wear, is between 90 and 95°C. If the thermostat is faulty and the coolant remains at a temperature significantly below this range, for example below 60°C, the engine does not operate at ideal parameters, which can lead to an increase in fuel consumption by 30 to 90%.
The correct answer is: A
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