Coolant is 60% water and 40% low temperature concentrate G12 A8D (low-temperature composition based on ethylene glycol with anti-corrosion additives). This mixture not only ensures the efficiency of the engine cooling system down to a temperature of –25°C, but also protects parts from corrosion, primarily parts made of light alloys. In addition, this mixture prevents the formation of scale and significantly increases the boiling point of the coolant.
Therefore, the content of low-temperature concentrate, also in the warm season and in countries with a warm climate, should not be reduced by using water for topping up. The share of low-temperature concentrate must be at least 40%.
If a higher frost resistance of the coolant is required in a harsh climate, the proportion of G12 A8D concentrate can be increased, but only up to 60% (the freezing temperature of the coolant in this case will be about -40°C), since with a larger proportion of low-temperature concentrate, the freezing point of the coolant will begin to rise, and, in addition, the heat capacity and thermal conductivity of the coolant will deteriorate.
Only use our G12 A8D formulation or TL-VW 774 D specification as the low temperature concentrate (pay attention to the inscription on the container).
Other concentrates may be primarily aggressive towards anti-corrosion coatings.
The corrosion of metal parts caused by these hubs can lead to coolant leakage, which in turn can cause serious engine damage.
Only our G12 A8D compound should be used as a low temperature concentrate.
Warning: When adding coolant, please note that under no circumstances should G12 be mixed with other low temperature concentrates (also with the composition of G11).
You can tell the composition of G12 by the red color of the coolant in the expansion tank. If the coolant in the expansion tank is brown, then G12 is mixed with another low temperature concentrate! In this case, the coolant must be replaced without fail!
Otherwise, serious engine malfunctions may occur!
Checking the level and density of the coolant
Warning: Never open the engine hood when you see steam coming out of the engine compartment or coolant flowing out - risk of burns! Wait until no more steam comes out or no more coolant flows.
The expansion tank of the engine cooling system is located in the engine compartment.
The coolant level can only be correctly checked when the engine is off.
The coolant level with a cold engine must be between the min and max marks on the expansion tank; when the engine is warm, the level may also be slightly above the max mark.
A coolant hydrometer must be used to check the density.
Loss of coolant
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.
Adding coolant
First, turn off the engine and let it cool down. Then cover the expansion tank cap with a rag and carefully unscrew it counterclockwise.
If under the circumstances you do not have G12 A8D low temperature concentrate, no other concentrate should be added to the system. In this case, only water can be added; at the first opportunity, it is imperative to restore the required composition of the coolant by adding the recommended low-temperature concentrate.
With a large loss of coolant, topping up should only be done when the engine is cold to avoid engine damage.
Warning: Do not fill the coolant above the max mark: excess liquid will, due to its expansion, flow out of the cooling system through the safety valve located in the plug.
Warning: Securely tighten the expansion tank cap.
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