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 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 suitable as a filled-for-life filling for cast iron and all-aluminum engines and gives optimum protection against freezing, corrosion damage, scaling and over-heating.
G 12 Plus increases the boiling point to 275°F (135°C) and ensures for a better heat dissipation.
The additional 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 is diminished.
The freeze protection must be guaranteed down to approximately -13°F (-25 °C).
Coolant Additive, Checking and Filling
Special tools and workshop equipment 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 T 10007 (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)
Freeze protection must be guaranteed down 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.
Follow all waste disposal regulations!
| Protection to °F (°C) | Difference (in liters) | ||
|---|---|---|---|
| Actual value | Specified value | 4-cylinder engines | 6-cylinder engines |
| 0 (32) | -25 (-13) | 3.5 | 5.0 |
| -35 (-31) | 4.0 | 6.0 | |
| -5 (23) | -25 (-13) | 3.0 | 4.5 |
| -35 (-31) | 3.5 | 5.5 | |
| -10 (14) | -25 (-13) | 2.0 | 3.5 |
| -35 (-31) | 3.0 | 4.5 | |
| -15 (5) | -25 (-13) | 1.5 | 2.5 |
| -35 (-31) | 2.0 | 3.5 | |
| -20 (-4) | -25 (-13) | 1.0 | 1.5 |
| -35 (-31) | 1.5 | 2.5 | |
| -25 (-13) | -35 (-31) | 1.0 | 1.5 |
| -30 (-22) | -35 (-31) | 0.5 | 1.0 |
| -35 (-31) | -40 (-40) | 0.5 | 0.5 |
-- Check the freeze protection after the road test.
Coolant Level, Checking and Filling
-- Check the coolant level in the coolant reservoir when the engine is cold.
- Delivery inspection: coolant level above "MIN marking" -arrow-.
- Inspection service: coolant level above "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
| Protection to | Coolant additive G 12 Plus / TL VW 774 F | Water |
|---|---|---|
| -25°C (-13°F) | approximately 40 % | approximately 60 % |
| -35°C (-31°F) | approximately 50 % | approximately 50 % |
| -40°C (-40°F) | approximately 60 % | approximately 40 % |
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 have coolant additive the whole year.
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%.