Audi TT (2007 year). Manual - part 45

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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

– 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

– 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