Audi TT (2007 year). Instruction - page 45

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.

– Unscrew bolts -1- and remove coolant pump -2-.
– Detach O-ring -3-.
Installing
• Tightening torque

⇒ page 170

.

Installation is carried out in the reverse order; note the following:

Note

Fit new O-ring.

– Clean and smoothen sealing surface for O-ring.
– Lightly lubricate O-ring -3- with coolant.
– Fit coolant pump -2-.
• Installation position: Sealing plug in housing faces down‐

wards.

– Install toothed belt (adjust valve timing)

⇒ page 91

.

– Fill up with coolant

⇒ page 166

.

2.3

Removing and installing thermostat

Special tools and workshop equipment required
♦ Hose clip pliers -V.A.G 1921-

Removing
– Drain coolant

⇒ page 163

.

– Remove radiator cowl

⇒ page 192

.

– Remove bolts -arrows-.
– Move coolant hose -3- clear.
– Loosen hose clip -2-.
– Unplug electrical connector -1- at charge pressure sender -

G31- and detach air pipe (front).

2. Coolant pump and thermostat

171

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.

– Unplug electrical connector -3- at intake manifold flap motor -

V157- .

– Release hose clip -4- and disconnect air hose from intake

manifold flap motor -V157- .

– Remove bolt -arrow- for dipstick guide tube.

Note

Disregard -items 1, 2-.

– Unscrew bolts -arrows- and detach intake manifold flap motor

-V157- .

– Release hose clip -1- and detach coolant hose from connec‐

tion.

– Unscrew bolts -arrows- and remove connection.

– Turn thermostat -2- approx. 90° anti-clockwise -arrow- and

take thermostat out of connection.

– Detach O-ring -1-.
Installing
• Tightening torque

⇒ page 170

.

Installation is carried out in the reverse order; note the following:

Note

Fit new O-ring.

– Clean and smoothen sealing surface for O-ring.

172

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.

– Fit thermostat -3- with O-ring -2- into connection -1-.
• Installation position: cross-piece on thermostat must be hori‐

zontal.

⇒ page 208

.

– Install air hose with plug-in connector

⇒ page 209

.

– Install radiator cowl

⇒ page 192

.

– Fill up with coolant

⇒ page 166

.

2.4

Removing and installing 4/2-way valve

with thermostat

Removing

Note

The thermostat is located in the interior of the 4/2-way valve and

cannot be renewed separately.

– Drain coolant

⇒ page 163

.

– Detach coolant hoses from connections -A, B and D-.
– Remove bolt -2-.
– Remove bolts -1-.
– Pull valve out of cylinder block and detach connection -C- from

coolant pipe to the left.

Installing
• Tightening torque

⇒ “2.1 Coolant pump and thermostat - exploded view”,

page 170

.

Installation is carried out in the reverse order; note the following:

Note

Fit new O-ring.

2. Coolant pump and thermostat

173

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.

2.5

Checking thermostat

– Heat removed thermostat in water bath.

Starts to open

Fully open

Opening travel

approx. 87 °C

approx. 102 °C

1)

at least 8 mm

1)

Cannot be tested.

174

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