Cooling System: Checking Frost Protection And Coolant Level - Volkswagen Passat 2015 Manual

Passat 2015 ➤, Passat 2019 ➤, Passat Variant 2015 ➤, Passat Variant 2019 ➤
Maintenance - Edition 11.2020
4.29 Cooling system: checking frost protec‐
tion and coolant level
Note
The water used for mixing has a major influence on the ef‐
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fectiveness of the coolant. Because the water quality differs
from country to country and even from region to region, the
quality of the water to be used in the cooling system has
been specified by Volkswagen. Distilled water satisfies all
requirements. Therefore, only ever use distilled water when
mixing coolant for topping up or renewing coolant.
Use only coolant additives which conform with the ⇒ Elec‐
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tronic Parts Catalogue (ETKA). Other coolant additives may
reduce corrosion protection substantially. The resulting dam‐
age could lead to loss of coolant and subsequent severe
damage to the motor.
Mixed in the proper proportions, coolant inhibits frost and
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corrosion damage as well as scaling. Such additives also
raise the boiling point of the coolant. For this reason, the
cooling system must be filled all-year-round with coolant ad‐
ditives.
Because of its high boiling point, the coolant improves en‐
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gine reliability under heavy loads, particularly in countries
with tropical climates.
The refractometer -T10007A- or refractometer -T10007B-
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must be used to determine the current anti-freeze value.
♦ Scale -1- of the refractometer is calibrated for the coolant
additives G12++ and G12evo.
Scale -2- of the refractometer is calibrated for the coolant
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additive G13.
If it is not possible to ensure that the same type of coolant
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additive is filled: always determine anti-freeze protection us‐
ing the scale for G13.
Frost protection must be guaranteed down to -25°C as a
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minimum and, in countries with arctic conditions, down to
approx. -36°C. Increasing the frost protection is permissible
only if climatic conditions require stronger frost protection. It
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4. Descriptions of work