For a good maintenance of the vehicle's cooling system, you believe . that it is necessary to frequently check the level of the coolant in the expansion vessel ? .
No, because the expansion vessel is watertight and no liquid evaporates .
Yes, at least once a year, circulate a lot or a little .
Yes, as many times as it is deemed convenient, bearing in mind that the liquid must always be found between the minimum and maximum marks that appear on the expansion vessel .