Checking Frost Protection, Replenishing Coolant Additive If Necessary - Volkswagen CJDA Workshop Manual

1.4.1 Checking frost protection, replenishing
coolant additive if necessary
Note
◆ Replenish only new coolant according to the Volkswagen
specification.
◆ The coolant level must be between the marks on the coolant
expansion tank. Do not fill up over the top line of the marked
area.
◆ Close the cap firmly.
◆ For engines as of model year 2008, only G 12 plus-plus ac-
cording to TL VW 774 G may be used as coolant additive.
◆ Coolant additive G 12 plus-plus must only be mixed with
G 12 plus! Identification: both are coloured purple.
◆ Coolant additives marked "according to TL VW 774 G" or
"according to TL VW 774 F" prevent frost and corrosion
damage, scaling and also raise boiling point of coolant.
Therefore, the cooling system must be filled all year round
with frost and corrosion protection additives.
◆ Because of its higher boiling point, the coolant improves en-
gine reliability under heavy loads, particularly in countries
with tropical climates.
◆ Frost protection is required down to about -25°C (in coun-
tries with arctic climates: down to about -35°C).
◆ The coolant concentration must not be reduced by adding
distilled water even in the warm season or in hot countries.
The coolant additive concentration must be at least 40%.
◆ If for climatic reasons greater frost protection is required, the
amount of G 12 plus-plus can be increased, but only up to
60% (frost protection to about -40 °C). Otherwise frost pro-
tection and cooling effectiveness are reduced again.
◆ The refractometer -T10007- is recommended for determining
the current anti-freeze density.
◆ If radiator, heat exchanger, cylinder head or cylinder head
gasket is renewed, do not reuse old coolant.
Special tools and workshop equipment required
◆ Refractometer -T10007- or
Workshop Manual for Diesel Engine (2.0 l/36-75 kW_EA 189) 05.2015
1 Removing and installing parts of cooling system
Industriemotoren - Industrial Engines 2009 ▶
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