Audi A8 2003 Workshop Manual page 223

8-cylinder TDI engine (4.2 ltr. 4-valve common rail), mechanics - Edition 12.2013
Note
The effectiveness of the coolant is greatly influenced by the
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quality of the water with which it is mixed. Because water may
contain different substances depending on the country or even
the region, the water quality to be used for cooling systems
has been specified. Distilled water meets all the requirements
and is therefore recommended for use when topping up or fill‐
ing up with coolant.
Use only coolant additives listed in the ⇒ Electronic parts
♦
catalogue (ETKA) . Other coolant additives could seriously
impair in particular the anti-corrosion properties. The resulting
damage could lead to loss of coolant and consequently to se‐
rious engine damage.
Coolant with the recommended mixture ratio prevents frost
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and corrosion damage and stops scaling. At the same time it
raises the boiling point of the fluid in the system. For this rea‐
son the cooling system must be filled all year round with the
correct coolant additive.
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Because of its high boiling point, the coolant improves engine
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with respect to the correctness of information in this document. Copyright by AUDI AG.
reliability under heavy loads, particularly in countries with trop‐
ical climates.
The refractometer - T10007A- MUST be used to determine the
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current level of frost protection.
The mixture must guarantee frost protection down to -25 ℃ (in
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countries with arctic climate: down to -36 ℃). The amount of
antifreeze can only be increased if greater frost protection is
required in very cold climates. This must only be up to -48 ℃,
however, as otherwise the cooling efficiency of the coolant is
impaired.
The coolant concentration must not be reduced by adding wa‐
♦
ter even in warmer seasons and in warmer countries. Frost
protection must be provided to at least -25 ℃.
Read off the level of frost protection on the scale for the rele‐
♦
vant coolant additive.
♦ The temperature indicated on the refractometer - T10007A-
corresponds to the temperature at which the first ice crystals
can form in the coolant.
Do not reuse coolant.
♦
Only use water/coolant additive as a lubricant for coolant ho‐
♦
ses.
Procedure:
– Fit coolant hose -arrow- onto coolant pipe.
1. Removing and installing parts of cooling system
Audi A8 2003 ➤
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