Topping up the coolant (VW Golf 4)

The engine cooling system must be filled with a mixture of water, antifreeze and anti-corrosion agent G12. Additives to the coolant prevent the engine block from freezing and the formation of corrosion and limescale, and also increase the boiling point of the coolant. Due to the fact that the cooling system is a sealed type, when the coolant is heated, there is excess pressure in the cooling system, which also contributes to an increase in the boiling point of the coolant. The pressure in the cooling system is limited to 1.2–1.5 bar by a valve in the expansion tank cap.

When adding fluid to the cooling system, even in warm weather, use only a mixture of antifreeze, anti-corrosion agent G 12 and clean water with a low lime content.

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