Coolant System, Checking

Coolant System, Checking

• Coolant additive 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.

• Use only approved radiator freeze and corrosion protection fluid for the different engine versions. Using other coolant additives can impair the corrosion protectant. Loss of coolant and cause considerable damage to the engine.

• 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 portion of the mixture must amount to at least 40% (freeze protection down to -13°F (-25 °C) and should not exceed 60% (freeze protection down to -40°F/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).

• 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.

• Observe waste disposal regulations!

Coolant Additive, Checking and Filling

Special tools, testers and auxiliary items required

• Refractometer (T10007)





- Check the concentration of the coolant additive using a (T10007). Refer to the Owner's Manual.





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 the freeze protection is insufficient, add coolant additive according to the mixture ratio and then perform a road test.

- Check the freeze protection after the road test.

Mixture ratio:





Coolant Level, Checking and Filling

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

- Remove the cover from the reservoir.





• Delivery Inspection: Coolant level at MAX mark.

• Audi inspection service service: coolant level between the MIN and MAX markings

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

Mixture ratio:





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