Audi TT (2007 year). Manual — part 43
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
1.2
Draining and filling cooling system
Special tools and workshop
equipment required
♦ Adapter for cooling system
tester -V.A.G 1274/8-
♦ Drip tray for workshop hoist
-VAS 6208-
♦ Hose clip pliers -
V.A.G 1921-
♦ Cooling system charge unit
-VAS 6096-
♦ Refractometer -T10007-
♦ Engine bung set -VAS 6122-
Draining
Note
Collect drained coolant in a clean container for re-use or disposal.
1. Cooling system
163
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
WARNING
Hot steam/hot coolant can escape - risk of scalding.
♦ The cooling system is under pressure when the engine is
hot.
♦ To allow pressure to dissipate, cover filler cap on coolant
expansion tank with cloth and open carefully.
– Open filler cap on coolant expansion tank.
– Release fasteners -1 ... 4- and remove centre noise insulation.
– Release hose clip -2-, lift retaining clip -1- and remove air hose.
Note
To prevent coolant from entering, seal off connection on charge
air cooler with a clean plug from engine bung set -VAS 6122- .
– Place drip tray for workshop hoist -VAS 6208- beneath engine.
– Lift retaining clip -arrow-, disconnect coolant hose (bottom)
from radiator and drain off coolant.
164
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
– Open hose clip -arrow-, disconnect coolant hose (bottom)
leading to pump for exhaust gas recirculation cooler -V400-
and drain off coolant.
1. Cooling system
165
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
– As an additional step, open hose clip -arrow-, disconnect cool‐
ant hose at top of engine oil cooler and drain off remaining
coolant.
Filling
Note
♦
The cooling system is filled all year round with a mixture of
water and coolant additive. Mixture ratio
♦
Use only the coolant additive listed in the ⇒ Electronic parts
catalogue . Other coolant additives could seriously impair in
particular the anti-corrosion properties. The resulting damage
could lead to loss of coolant and consequently to serious en‐
gine damage.
♦
The specified coolant (based on recommended mixture ratio)
prevents frost and corrosion damage and stops
scaling. Such additives also raise the boiling point of the cool‐
ant. For these reasons the cooling system must be filled all
year round with the correct coolant additive.
♦
Because of its high boiling point, the coolant improves engine
reliability under heavy loads, particularly in countries with trop‐
ical climates.
♦
Frost protection is required down to about –25 °C (in countries
with arctic climate: down to about –35 °C).
♦
The coolant concentration must not be reduced by adding wa‐
ter even in warmer seasons and in warmer countries. The
coolant concentration must be at least 40 %.
♦
If greater frost protection is required in very cold climates, the
coolant concentration can be increased, but only up to 60%
(this gives frost protection down to about –40 °C). If the con‐
centration exceeds 60%, frost protection decreases again and
cooling efficiency is also impaired.
♦
Use only clean tap water for mixing coolant.
♦
If radiator, heat exchanger, cylinder head, cylinder head gas‐
ket or cylinder block have been renewed, do not re-use old
coolant.
♦
Contaminated or dirty coolant must not be used again.
♦
To check anti-freeze protection in cooling system, use refrac‐
tometer -T10007- .
Recommended mixture ratio for coolant
• Coolant (40 %) and water (60 %) for frost protection to –25 °
C
• Coolant (50 %) and water (50 %) for frost protection to –35 °
C
• Coolant (40 %) and water (60 %) for frost protection to –40 °
C
♦ Coolant ⇒ Electronic parts catalogue
166
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