Audi A8 2003 Maintenance Manual page 92

Audi A8 2003 ➤
Maintenance - Edition 06.2014
Note
Coolant additives may only be mixed with distilled water, as
♦
the effectiveness of the coolant and the corrosion protection it
provides are greatly influenced by the quality of the water with
which the coolant is mixed. To ensure an adequate water
quality, the coolant additive should be mixed with distilled wa‐
ter.
For approved coolant additives, refer to Electronic parts cata‐
♦
logue (ETKA).
G13 and G12++ may be mixed together.
♦
Coolant additives G13 and G12++ may be mixed with coolant
♦
additives G11, G12 and G12+, though this may result in de‐
creased corrosion protection.
G12 and G11 may NOT be mixed together.
♦
Do not reuse coolant.
♦
Only water/coolant additive may be used as lubricant for cool‐
♦
ant hoses.
Checking anti-freeze additive
Checking coolant level
Filling up coolant ⇒ page 90
3.47.1 Checking anti-freeze
Special tools and workshop equipment required
♦ Refractometer - T10007 A-
Requirements:
• Anti-freeze protection must be guaranteed to -25 °C (in coun‐
tries with an arctic climate to -36 ℃); note specification in
Maintenance table.
• The proportion of coolant additive must not exceed 55 %
(gives anti-freeze protection down to -48 °C); beyond this con‐
centration the frost protection and the cooling efficiency are
reduced again.
Procedure:
– Use a pipette to place a drop of coolant on glass of refractom‐
eter - T10007 A- . Light-dark border will now be clearly visible
through refractometer.
88
3. Maintenance
⇒ page 88
⇒ page 89
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