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 

⇒ page 166

♦

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)

⇒ page 166

 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