A significant decrease in the level of the coolant gives the right to assume, first of all, a violation of the tightness of the seals. In this case, the engine cooling system should be checked immediately by a Volkswagen workshop. It is not enough to limit yourself to just topping up the coolant.
In a cooling system with serviceable seals, a decrease in the coolant level can only occur when the liquid boils and is thrown out when the engine overheats.
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