In which element of the cooling circuit must the coolant level be checked?

Question

DentroTest · Accepted Answer

The coolant level must be checked in the expansion tank or reservoir. This translucent container has external 'MINIMUM' and 'MAXIMUM' marks to allow a quick visual inspection without having to open the circuit. The check must always be carried out with the engine cold and on a flat surface to avoid false readings and to prevent serious burns from pressurized steam. Expansion tank (correct): It is the reservoir intended to absorb the changes in volume that the coolant undergoes as it heats up and cools down, and it is the ideal and safe place to check its quantity. Thermostat (incorrect): It is a heat-sensitive valve that regulates the flow of fluid to the radiator when the engine reaches its operating temperature; it is not an accessible element, nor one designed to measure levels. Radiator (incorrect): It is the heat exchanger in charge of cooling the liquid by means of the outside air current. In modern circuits it is not the routine checking point, and opening it when hot carries a high risk of accident.

In which element of the cooling circuit must the coolant level be checked?

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