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)
.
– 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.
.
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
3 - O-ring
❑ Renew
4 - O-ring
❑ Renew
5 - 4/2-way valve with thermo‐
stat
❑ Installed according to
version
❑ Removing and installing
❑ 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
❑ Checking
❑ Only fitted on version
with connection -7-
2.2
Removing and installing coolant pump
Removing
– Drain coolant
.
– Remove toothed belt
170
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