Engine cooling system (VW Golf 4)

The engine cooling system is filled at the factory with a long-life coolant that does not need to be replaced.

The coolant consists of 60% water and 40% low-temperature concentrate G12 (low-temperature composition based on ethylene glycol with anti-corrosion additives). This mixture not only ensures the engine cooling system operates at temperatures down to -25°C, but also protects parts from corrosion, especially parts made of light alloys. In addition, this mixture prevents scale formation and significantly increases the boiling point of the coolant.

Therefore, the content of low-temperature concentrate should not be reduced by using water for topping up even in warm seasons and in countries with warm climates. The proportion of low-temperature concentrate should be at least 40%.

If a higher frost resistance of the coolant is required in severe climate conditions, the proportion of G12 concentrate can be increased, but only to 60% (the freezing point of the coolant in this case will be about -40°C), since with a higher proportion of low-temperature concentrate, the freezing point of the coolant will begin to increase, and, in addition, the heat capacity and thermal conductivity of the coolant will deteriorate.

As a low temperature concentrate, only our G12 formulation or concentrate with the specification TL-VW 774 D should be used (pay attention to the inscription on the container).

Other concentrates may, above all, be significantly aggressive towards anti-corrosion coatings.

Corrosion of metal parts caused by these concentrates can lead to coolant leakage, which in turn can cause serious engine damage.



Only our G12 formulation should be used as a low temperature concentrate.

When topping up the coolant, please note the following: under no circumstances should G12 be mixed with other low-temperature concentrates (also with the G11 composition).

You can determine the G12 composition by the red color of the coolant in the expansion tank. If the coolant in the expansion tank is brown, then the G12 composition is mixed with another low-temperature concentrate! In this case, you must replace the coolant!

Otherwise, serious problems with engine operation may occur!