Cooling System: Checking Frost Protection And Coolant Level - Volkswagen Touareg 2010 Maintenance Manual

Touareg 2010 ➤ , Touareg 2015 ➤
Maintenance - Edition 02.2019
4.25 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. As the water quality differs from coun‐
try 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 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 major engine
damage.
♦ Mixed in the correct proportions, coolant inhibits frost and cor‐
rosion damage as well as scaling. Such additives also raise
the boiling point of the coolant. Therefore, 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.
ONLY refractometer - T10007A- may be used 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.
The coolant concentration must not be reduced by adding wa‐
♦
ter even in warmer seasons and in warmer countries. Frost
protection must be guaranteed down to at least -25°C.
♦ Read off anti-freeze figures for respective replenished coolant
additives.
The temperature read off the refractometer - T10007A- corre‐
♦
sponds the »ice flocculation point«. Flakes of ice may start
forming in the coolant below this temperature.
Never reuse old coolant.
♦
Use only a water/coolant additive mixture as a slip agent for
♦
coolant hoses.
4.25.1 Frost protection: checking, replenishing
coolant additive if necessary
Special tools and workshop equipment required
68
4. Descriptions of work: