Cooling System: Check Frost Protection And Coolant Level - Volkswagen Golf 2004 Service Manual

Golf 2004 ➤ , Golf Plus 2005 ➤
Maintenance - Edition 11.2009
4.23 Cooling system: Check frost protection
and coolant level
Note
From model year 2008 all engines are filled with coolant ad‐
♦
ditive G12 Plus Plus (purple). Because of its positive charac‐
teristics, ensure that only G12 Plus Plus is used when
replenishing. G12 Plus must not be replenished because the
positive characteristics of G12 Plus Plus are then not effective.
Up to model year 2007 all engines are filled with coolant ad‐
♦
ditive G12 Plus according to TL VW 774 F (purple). Because
of its positive characteristics, ensure that only G12 Plus or G12
Plus Plus is used when replenishing.
Coolant additive G12 Plus Plus protects the complete cooling
♦
system against corrosion and reduces the formation of sludge
and corrosion.
G12 Plus Plus is suitable as a filled-for-life filling for cast iron
♦
and all-aluminium engines and gives optimum protection
against frost, corrosion damage, scaling and overheating.
G12 Plus Plus raises the boiling point to 135 °C and ensures
♦
better heat dissipation.
The coolant concentration must be at least 40 % (frost pro‐
♦
tection to -25 °C) and should never exceed 60 % (frost pro‐
tection to -40 °C). Otherwise both frost protection and cooling
efficiency will be reduced.
♦ Frost protection must be guaranteed to approx. -25 °C.
4.23.1 Checking frost protection, replenish
coolant additive if necessary
Special tools and workshop equipment required
♦ Refractometer -T10007-
Note
Read precise value for the following tests at bright/dark boundary.
Using a pipette, place a drop of water on the glass to improve the
readability of the bright/dark boundary. The bright/dark boundary
can be clearly recognised on the "WATERLINE".
– Check concentration of coolant additive using refractometer -
T10007- (refer to operating instructions).
72
4. Descriptions of work