Coolant System, Checking

Coolant System, Checking

• All new engines are filled with coolant additive G 12 Plus according to TL VW 774 F (purple color). G 12 Plus can be mixed with the previous coolant additives G 11 and G 12 (red). Due to its positive properties, be sure to use G 12 Plus only.

• G 12 Plus is a life-long coolant designed for cast iron and aluminum engines, and protects the engine optimally from freeze, corrosion damage, scaling, and overheating.

• G 12 Plus increases the boiling point to 275°F (135°C) and ensures for a better heat dissipation.

• The coolant portion of the mixture must amount to at least 40% (freeze protection to -13°F [-25°C]) and should not exceed 60% (freeze protection to -40°F [-40°C]). Otherwise the freeze protection will be reduced and the cooling efficiency will be worsened.

• The freeze protection must be ensured to approximately -13°F (-25° C).

Freeze Protection, Checking and Adding Coolant Additive

Special tools, testers and auxiliary items required

• Refractometer (T10007)





• Read the bright/ark boundary to obtain an accurate reading for the following tests. Place a drop of water on the glass to improve the readability of the bright/dark boundary. The bright/dark boundary can be clearly recognized on the "WATERLINE".

- Check the concentration of the coolant additive using (T10007) (operating instructions).

The scale - 1 - of the refractometer is designed for coolant additives G 12; G12 Plus and G11.





Scale - 2 - refers only to coolant additive G 13. (begins L80)

• The freeze protection must be ensured to approximately -13°F [-25°C].

• If for climatic reasons greater freeze protection is required, the amount of G 12 Plus can be increased, but only up to 60% (freeze protection to about -40°F [-40°C]), otherwise freeze protection and cooling effectiveness will be reduced.

- If freeze protection is insufficient, drain off required quantity shown in freeze protection table and add coolant additive G 12 Plus.

• Observe waste disposal regulations!





- Check the freeze protection after the road test.

Coolant Level, Checking and Filling

- Check the coolant level in the reservoir when the engine is cold.

• Delivery inspection: Coolant level above the "MIN. marking" - arrow -.

• Inspection service: Coolant level above the "MIN. marking" - arrow -.





- If coolant level is too low, fill with coolant mixture.

• Determine cause of fluid loss, which cannot be attributed to normal use and repair.

Mixture ratio:





• Coolant additive G 12 Plus conforming to TL VW 774 F prevents freeze and corrosion damage, scaling, and raises the boiling point. For these reasons, the cooling system must be filled with radiator freeze and corrosion protection fluid all year round.

• Especially in countries with tropical climates or when vehicle is driven under heavy load, the coolant improves the engine reliability by its increased boiling point.

• The coolant concentration must not be reduced by adding water, even during the warmer season. The coolant additive ratio must be at least 40%.