Passat 2011 ➤ , Passat Variant 2011 ➤
Maintenance - Edition 01.2019
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
4. Descriptions of work:
95
Passat 2011 ➤ , Passat Variant 2011 ➤
Maintenance - Edition 01.2019
♦ Refractometer - T10007 A-
Note
Read precise value for the following tests at light/dark boundary.
Using a pipette, place a drop of water on the glass to improve the
readability of the light/dark boundary. The light-dark border can
be clearly recognised on the “WATERLINE”.
– Check concentration of coolant additive using refractometer -
T10007 A- (refer to operating instructions).
The scale -1- of the refractometer is calibrated for coolant addi‐
tives G12; G12 Plus, G12 Plus Plus and G11.
The scale -2- is only calibrated for coolant additive G13.
Note
♦ If the currently used coolant additive cannot be determined
precisely, use the scale -2- for coolant additive G13.
♦ Please observe disposal instructions!
– Check coolant additive concentration after road test again.
4.27.2
Coolant level: checking, replenishing
coolant if necessary
– Check coolant level in expansion tank when engine is cold.
♦ Delivery inspection: coolant level above “min” marking
-arrow-
♦ Inspection service: coolant level above “min” marking
-arrow-
– If coolant is too low, add required amount according to mixture
ratio.
Note
If fluid loss is greater than can be expected through normal use,
determine source and rectify (repair measure).
96
4. Descriptions of work:
Passat 2011 ➤ , Passat Variant 2011 ➤
Maintenance - Edition 01.2019
4.27.3
Mixing ratio:
Caution
Use only distilled water for mixing coolant additives. The use
of distilled water ensures optimum protection against corro‐
sion.
Frost protection to
Coolant additive
portion
Distilled water
-25 °C
-36 °C
approx. 40%
approx. 50 %
approx. 60 %
approx. 50 %
4.28
Diesel fuel filter: renewing
Special tools and workshop equipment required
♦ Diesel extractor - VAS 5226-
♦ Angled screwdriver - VAS 6543-
Removing:
Caution
♦ Ensure that no diesel fuel contacts other components in
the engine compartment. Clean immediately, if necessa‐
ry.
Remove engine cover panel ⇒ page 106 .
4. Descriptions of work:
97
2024 VW Passat Owner's Manual
VW Passat B7 Service & Repair Manual
VW Passat B6 Service & Repair Manual
