The thermostat belongs to the cooling system of an internal combustion engine which 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 starting, so that it reaches the optimal operating temperature as quickly as possible, and of opening it, to allow the passage of the coolant to the radiator after the engine has reached the optimal operating temperature.
Frequent driving with a defective thermostat and with a coolant temperature below 60 degrees Celsius leads to an increase in fuel consumption by 30 to 90%.
The correct answer is: B
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