Audi TT (2007 year). Manual - part 44

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.

– Connect coolant hose with plug-in connector to radiator (bot‐

tom) 

⇒ page 191

 .

– Connect coolant hose (bottom) at pump for exhaust gas re‐

circulation cooler -V400- -arrow-.

– Connect coolant hose (top) to engine oil cooler -arrow-.

– Fill reservoir of cooling system charge unit -VAS 6096- with at

least 8 litres of premixed coolant (according to recommended

ratio):

– Fit adapter for cooling system tester -V.A.G 1274/8- onto cool‐

ant expansion tank.

– Attach cooling system charge unit -VAS 6096- to adapter -

V.A.G 1274/8- .

– Run vent hose -1- into a small container -2-.

Note

The vented air draws along a small amount of coolant, which

should be collected.

– Close both valves -A- and -B- (turn lever at right angles to di‐

rection of flow).

– Connect hose -3- to compressed air.
• Pressure: 6 ... 10 bar.

1. Cooling system    

167

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 valve -B- by setting lever in direction of flow.
• The suction jet pump generates a partial vacuum in the cooling

system; the needle on the gauge should move into the green

zone.

– Also briefly open valve -A- (turn lever in direction of flow) so

that hose on reservoir of -VAS 6096- can fill with coolant.

– Close valve -A- again.
– Leave valve -B- open for another 2 minutes.
• The suction jet pump continues to generate a partial vacuum

in the cooling system; the needle on the gauge should remain

in the green zone.

– Close valve -B-.
• The needle on the gauge should stop in the green zone. The

vacuum level in the cooling system is then sufficient for sub‐

sequent filling.

Note

♦

If the needle does not reach the green zone, repeat the proc‐

ess.

♦

Check cooling system for leaks if the vacuum is not main‐

tained.

– Detach compressed air hose.
– Open valve -A-.
• The vacuum in the cooling system causes the coolant to be

drawn out of the reservoir of -VAS 6096- ; the cooling system

is then filled.

– Detach cooling system charge unit -VAS 6096- from coolant

expansion tank.

⇒ page 209

 .

30 seconds) and then off again.

– Set temperature to “HI”.
– Switch off air conditioner compressor (press 

AC

 button, LED

in button should not light up

– Start engine and run for 2 minutes (maximum) at approx. 1500

rpm.

– Top up coolant to overflow hole on expansion tank with engine

running.

– Close filler cap on coolant expansion tank.
– Allow engine to run at idling speed until two large coolant ho‐

ses at radiator become warm.

– Switch off ignition and allow engine to cool down.

168

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.

– Check coolant level.
• The coolant level must be between the “min” and “max” mark‐

ings when the engine is cold.

• The coolant level can be at the “max” marking when the engine

is warm.

– Top up with coolant again if necessary.

1. Cooling system    

169

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.

2

Coolant pump and thermostat

2.1

Coolant pump and thermostat - exploded view

1 - Bolt

❑ 15 Nm

2 - Coolant pump

❑ Removing and installing

⇒ page 170

3 - O-ring

❑ Renew

4 - O-ring

❑ Renew

5 - 4/2-way valve with thermo‐

stat

❑ Installed according to

version

❑ Removing and installing

⇒ page 173

❑ The thermostat is loca‐

ted in the interior of the

4/2-way valve and can‐

not be renewed sepa‐

rately

6 - Bolt

❑ 15 Nm

7 - Connection

❑ Installed according to

version

8 - Thermostat

❑ Removing and installing

⇒ page 171

❑ Checking 

⇒ page 174

❑ Only fitted on version

with connection -7-

2.2

Removing and installing coolant pump

Removing
– Drain coolant 

⇒ page 163

 .

– Remove toothed belt 

⇒ page 86

 .

170