Cooling system: Check freeze protection, add coolant, if necessary
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NOTE:
- 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). Ensure that the system is replenished only with G12 Plus (due to its positive properties).
- 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 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).
Checking freeze protection and adding coolant additive if necessary
Special tools, testers and auxiliary items required
- Refractometer T10007
NOTE:
- Read the bright/dark 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 refractometer 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. (previously L80)
NOTE:
- 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.
NOTE:
- Observe waste disposal regulations!
| Freeze protection to ° C | Difference amount in liters | |||
|---|---|---|---|---|
| Actual value | Specified value | 4-cylinder engines | 6-cylinder engines | 8-cylinder engines |
| 0 | -25 | 3,5 | 5,0 | 5,0 |
| -35 | 4,0 | 6,0 | 6,0 | |
| -5 | -25 | 3.0 | 4,5 | 4,5 |
| -35 | 3,5 | 5,5 | 5,5 | |
| -10 | -25 | 2.0 | 3,5 | 3,5 |
| -35 | 3.0 | 4,5 | 4,5 | |
| -15 | -25 | 1,5 | 2.5 | 2.5 |
| -35 | 2.0 | 3,5 | 3,5 | |
| -20 | -25 | 1,0 | 1,5 | 1,5 |
| -35 | 1,5 | 2.5 | 2.5 | |
| -25 | -35 | 1,0 | 1,5 | 1,5 |
| -30 | -35 | 0,5 | 1,0 | 1,0 |
| -35 | -40 | 0,5 | 0,5 | 0,5 |
- Check coolant additive concentration after test drive again.
Checking coolant level and adding coolant if necessary
- Check coolant level in expansion tank with engine cold.
- Delivery inspection: Coolant level above the "MIN marking" - arrow -.
- Inspection service: Coolant level above the "MIN marking" - arrow -.
- If coolant is too low, add required amount according to mixture ratio.
NOTE:
- Determine cause of fluid loss which cannot be attributed to normal use and rectify (repair measure).
Mixture ratio:
| Freeze protection to | Coolant additive G 12 Plus / TL VW 774 F | Water |
|---|---|---|
| -25 ° C | approx. 40% | approx. 60 % |
| -35 ° C | approx. 50 % | approx. 50 % |
| -40 ° F | approx. 60 % | approx. 40% |
NOTE:
- 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%.