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Checking freeze protection and adding coolant additive if necessary
Special tools, testers and auxiliary items required
Fig. 31: Refractometer T10007
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Refractometer T10007
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 (1 35 ° 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 exc eed 60% (freeze
protection to -40 ° F [-40 ° C]). Otherwise the fre eze protection will be
reduced and the cooling efficiency will be worsened.
The freeze protection must be ensured to approximately -13 ° F (-25 ° C).
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
2008 Audi A6 Quattro
Maintenance Maintenance Procedures
FIXYOURCAR
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