Cooling System Precautions

If the fluid in expansion tank is brown, G12 has been mixed with other coolant. In this is the case, coolant must be replaced. "G12" and coolant additives marked "In accordance with TL VW 774 D" prevent frost and corrosion damage, scaling and also raise the boiling point of the coolant. Therefore, cooling system must be filled year round with frost and corrosion protection additives.

A higher boiling point improves engine reliability under heavy load particularly in countries with tropical climates. Frost protection additives protect against frost to about -25 C (about -35 C in arctic climates). The coolant concentration must not be reduced by adding water even in warmer seasons and in warmer countries. The anti-freeze ratio must be at least 40%.

If for climatic reasons greater frost protection is required, the amount of G12 can be increased, but only up to 60% (frost protection to about -40 C), otherwise frost protection and cooling effectiveness will be reduced.