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4.21.1 Checking frost protection, if necessary
replenish coolant additive
Special tools and workshop equipment required
♦ Refractometer -T10007 A-
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 A- (refer to operating instructions).
The scale -1- of the refractometer is calibrated for coolant additive
G12 Plus Plus.
The scale -2- is only calibrated for coolant additive G13.
Note
♦
Frost protection must be guaranteed to approx. -25 °C.
♦
If a stronger form of frost protection is required for climatic
reasons, the percentage of G12 Plus Plus can be increased.
But only up to 60 % (frost protection down to about -40 °C), as
otherwise frost protection will be reduced again and cooling
effectiveness is also reduced.
– If frost protection is insufficient, drain coolant and top up with
coolant additive G12 Plus Plus ⇒ page 48 .
Note
Observe disposal regulations!
– Check coolant additive concentration after road test again.
Touareg 2010 ➤
Maintenance - Edition 11.2011
4. Descriptions of work 47
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