4.27
Cooling system: checking frost protec‐
tion and coolant level
Note
♦
The water used for mixing has a major influence on the effec‐
tiveness 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 speci‐
fied by Volkswagen. Distilled water fulfils 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‐
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 cor‐
rosion damage as well as scaling. Furthermore, the boiling
point is raised. For these reasons, the cooling system must be
filled all year round with a coolant additive.
♦
Because of its high boiling point, the coolant improves engine
reliability under heavy loads, particularly in countries with trop‐
ical climates.
♦
Use ONLY refractometer - T10007A- for determining current
anti-freeze value.
♦
Frost protection must be guaranteed down to -25°C as a min‐
imum and, in countries with arctic conditions, down to approx.
-36°C. Increasing the frost protection is permissible only if cli‐
matic conditions require stronger frost protection. It may, how‐
ever, be increased only to a maximum of -48°C. Otherwise,
the cooling effect will be impaired.
♦
Do not reduce the coolant concentration by adding water even
in the warm season or in hot countries. Frost protection must
be guaranteed down to at least -25°C.
♦
Read anti-freeze figures from the respective scale for type of
anti-freeze added.
♦
The temperature read off the refractometer - T10007A- corre‐
sponds the »ice flocculation point«. Flakes of ice may start
forming in the coolant at this temperature.
♦
Never reuse old coolant.
♦
Use only a water/coolant additive mixture as a slip agent for
coolant hoses.
4.27.1
Frost protection: checking, replenishing
coolant additive if necessary
Special tools and workshop equipment required
Passat 2011 ➤ , Passat Variant 2011 ➤
Maintenance - Edition 01.2019
4. Descriptions of work:
95