Cooling System, Checking Freeze Protection And Filling
High Voltage System Warning Messages:
Working When the Ignition May Not Be On, refer to WORKING WHEN THE IGNITION MAY NOT BE ON .
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 will be worsened.
The freeze protection must be ensured down to approximately -13°F (-25°C).
If climate conditions make greater freeze protection necessary, the amount of can be increased up to 60% (Freeze protection to approximately -40 °F/C). Adding more coolant reduces the freeze protection and reduces the cooling efficiency.
Coolant additive 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.
Permissible freeze protection, refer to the Parts Information
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 using a pipette.
-- Check the concentration of the coolant additive using refractometer:T10007 (operating instructions). The bright/dark boundary can be clearly recognized on the "WATERLINE".
The scale -1- of the refractometer is designed for coolant additives G 12, G12 Plus, G12 Plus Plus and G11.
Scale -2- refers only to coolant additive G 13. (begins L80).
-- If freeze protection ratio is too low, drain listed amount and replace it with coolant additive G12 Plus conforming to TL "VW 774 F".
Coolant Level, Checking and Filling
-- Check the coolant level in the 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
| Freeze protection to | Coolant additive G 012 A8 D | 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% |