Audi Workshop Service and Repair Manuals

Exploded view of auxiliary heater add-on components   Note t  On replacement, pay attention to the correct version of the auxiliary heater (different versions for vehicles with petrol and diesel engines) → Chapter and → Vehicle diagnostic, testing and information systemVAS 5051/, “Guided fault-finding function”. t  This auxiliary heater is installed in various vehicle models. The part number changes each time this auxiliary heater is fitted in a new vehicle model (e.g. from 8K0 xxx xxx to 8R0 xxx xxx on introduction of the Audi Q5 and subsequently to 4xx xxx xxx etc.). Attention must therefore be paid to correct assignment. Care must however also be taken to ensure that an old auxiliary heater version is never installed in a vehicle previously fitted with a newer version. For example, an Audi A4 provided at the factory with an auxiliary heater with part number 8R0 xxx xxx is not to be fitted with an auxiliary heater with part number 8K0 xxx xxx → Electronic parts catalogue. t  As of 10.2010 auxiliary heaters with part number 4xx xxx  xxx are gradually to be introduced. Service installation of this version of the auxiliary heater is also possible in vehicles originally fitted with an auxiliary heater with part number 8R0 xxx xxx or 8K0 xxx xxx. As however there are differences between certain components of the various auxiliary heater versions (e.g. the 2-pin connector for the power supply to the auxiliary heater control unit -J364-), attention must be paid to correct assignment when replacing individual components of the auxiliary heater → Electronic parts catalogue. t  If an auxiliary heater with part number 4xx xxx  xxx is fitted, attention must also be paid with this version to correct encoding for the vehicle concerned (different functions are stored in the control unit depending on the type of vehicle encoded) → Electronic parts catalogue and → Vehicle diagnostic, testing and information systemVAS 5051/, “Guided fault-finding function”. Layout of components on Audi A4 and Audi A5 Coupé

1 -

Holder

2 -	Auxiliary heater

q	Removing and installing → Chapter

q

Different versions; the Audi Q5 is not to be fitted with auxiliary heaters with part number 8K0.xxx.xxx for example. In addition, the versions depend on the production period and the type of fuel (there are different settings for certain functions for petrol and diesel) → Chapter and → Electronic parts catalogue

t

As of Model Year 2010 a start/stop system will be available as an optional extra for this vehicle in conjunction with certain engines. On these vehicles, pay attention to the correct version of the air conditioner operating and display unit, Climatronic control unit -J255- and of the auxiliary heater → Electronic parts catalogue and → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.

t	Vehicles with a start/stop system are not to be fitted with auxiliary heaters with part number 8K0 xxx xxx → Electronic parts catalogue and → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.

3 -

Clamp

q	Bolt tightening torque 6 Nm

q	For corrugated pipe to exhaust silencer

4 -

Bolt

q	Tightening torque 6 Nm

q	For the holder of the intake air noise insulation

q	Self-tapping bolt with coating, replace

5 -	Intake air noise insulation

q	Removing and installing → Chapter

t	Secure the intake hose with a clamp to stop it slipping off the air intake connection of the auxiliary heater.

t	If applicable, additionally attach the intake air noise insulation with cable ties to the auxiliary heater holder.

6 -	Exhaust silencer

q	Removing and installing → Chapter

Depending on the design of the auxiliary heater and the vehicle equipment spec, there may be a thermal insulator on the exhaust pipe fitted between the auxiliary heater and the exhaust silencer (to protect the surrounding components).

7 -

Clamp

q	Tightening torque 6 Nm

q	For exhaust pipe

8 -	Exhaust pipe

t	The flow of exhaust gas out of the exhaust pipe must not be obstructed.

t	After working on the auxiliary/supplementary heater or the noise insulation, check the mouth of the exhaust pipe. This must be fitted at right angles to the noise encapsulation where it passes through the noise encapsulation → Chapter.

9 -

Bolt

q	Tightening torque 6 Nm

q	For holder of circulation pump -V55-

q	Self-tapping bolt with coating, replace

q	A rubber grommet is fitted as isolator between the bolt and holder → Anchor

10 -

Bolt

q	Tightening torque 3.5 Nm

q	For circulation pump -V55- retaining clip

11 -	Circulation pump -V55-

q	Removing and installing → Chapter

12 -	Connection for fuel pipe

13 -

Nut

q

2x

q	Tightening torque 20 Nm

q	Heed tightening sequence → Chapter „Installing auxiliary heater“

14 -

Bolt

q	Tightening torque 20 Nm

q	Heed tightening sequence → Chapter „Installing auxiliary heater“

15 -	Control line connector

q	Attached to the holder with a clip

16 -	Power supply connector

q	Attached to the holder with a clip

q	Different connector versions depending on the model

As of 10.2010 auxiliary heaters with part number 4xx xxx  xxx are gradually to be introduced. Service installation of this version of the auxiliary heater is also possible in vehicles originally fitted with an auxiliary heater with part number 8R0 xxx xxx or 8K0 xxx xxx. As however there are differences between certain components of the various auxiliary heater versions (e.g. the 2-pin connector for the power supply to the auxiliary heater control unit -J364-), attention must be paid to correct assignment when replacing individual components of the auxiliary heater → Electronic parts catalogue.

17 -	Heater coolant shut-off valve -N279-

q	Fitted in the plenum chamber on the right.

q	Removing and installing → Chapter

q	Operation → Chapter

q	Different versions (for Audi A5 Coupé, Audi A4 and Audi Q5); pay attention to correct assignment → Electronic parts catalogue.

t	To stop the flow of coolant from the cylinder head being completely interrupted with the engine running and -N279- actuated, certain vehicles are fitted with a non-return valve in the coolant circuit → Chapter

t

On the Audi Q5, actuation of -N279- is only permissible up to a certain engine speed (currently up to approx. 1200 rpm). Attention is therefore to be paid to the correct version, encoding and adaption of the auxiliary heater → Vehicle diagnostic, testing and information systemVAS 5051/, “Guided fault-finding function”.

18 -

Bolt

q	Tightening torque 8 Nm

q	For heater coolant shut-off valve -N279-

Auxiliary heater holder on Audi A4 and Audi A5 Coupé 1 -  Power supply and control line connectors 2 -  Clip with cable tie 3 -  Nut - tightening torque 8 Nm 4 -  Bolt - tightening torque 6 Nm 5 -  Bolt - tightening torque 6  Nm (self-tapping with coating, replace) 6 -  Nut - tightening torque 6 Nm 7 -  Bolt - tightening torque 6 Nm 8 -  Heater holder Layout of components on the Audi Q5 View “1”   Note t  The holders for the auxiliary heater were gradually modified on the Audi Q5 in Model Year 2009. Pay attention to the correct assignment when replacing the auxiliary heater and holders → Electronic parts catalogue and → Anchor.

t  At the start of production, the auxiliary heater -A- was attached to the holders -B- and -C-. Modified auxiliary heaters -D- were then gradually introduced in Model Year 2009 (soundproofing measure, not visible from outside). These auxiliary heaters are attached to the holders -D- (with reinforcement -E-) and -F-. If an ex-works auxiliary heater attached to holders -B- and -C- is replaced, this is to be fitted with the holders -D- (with reinforcement -E-) and -F- → Electronic parts catalogue.

t	The following illustration shows the auxiliary heater with the holder “2” which was fitted at the start of production in Model Year 2009.

t	Refer to view “2” for all components not mentioned.

1 -

Holder 1

q	Holders “1” and “2” are bolted together → Anchor

q	Different versions depending on the production period.

2 -	Holder “2”

q	Holders “1” and “2” are bolted together → Anchor

q	Different versions depending on the production period.

3 -	Connection for fuel pipe

4 -	Auxiliary heater

q	Removing and installing → Chapter

q

Different versions; the Audi Q5 is not to be fitted with auxiliary heaters with part number 8K0.xxx.xxx for example. In addition, the auxiliary heater version depends on the production period and the type of fuel (there are different settings for certain functions for petrol and diesel) → Chapter and → Electronic parts catalogue

5 -

Clamp

q	Bolt tightening torque 6 Nm

q	For corrugated pipe to exhaust silencer

6 -	Intake air noise insulation

q	Removing and installing → Chapter

q	Attached with retainers and cable ties to holder “2”.

t	Secure the intake hose with a clamp to stop it slipping off the air intake connection of the auxiliary heater.

t	If applicable, additionally attach the intake air noise insulation with cable ties to the auxiliary heater holder.

7 -	Thermal insulation at corrugated pipe to exhaust silencer

q	Not fitted with all versions → Electronic parts catalogue

8 -	Exhaust silencer

q	With corrugated pipe

q	Removing and installing → Chapter

Depending on the version of the auxiliary heater and the vehicle equipment, the exhaust pipe fitted between the auxiliary heater and the exhaust silencer may be provided with thermal insulation (to protect the surrounding components).

9 -

Clamp

q	Tightening torque 6 Nm

q	For exhaust pipe

10 -	Exhaust pipe

t	The flow of exhaust gas out of the exhaust pipe must not be obstructed.

t	After working on the auxiliary/supplementary heater or the noise insulation, check the mouth of the exhaust pipe. This must be fitted at right angles to the noise encapsulation where it passes through the noise encapsulation → Chapter.

11 -

Bolt

q	Tightening torque 6 Nm

q	For holder “1”

q	Self-tapping bolt with coating, replace

q	A rubber grommet is fitted as isolator between the bolt and holder → Anchor

12 -	Coolant hose

q	Between circulation pump -V55- and auxiliary heater

13 -	Circulation pump -V55-

q	Removing and installing → Chapter

14 -

Nut

q

2x

q	Tightening torque 20 Nm

q	Heed tightening sequence → Chapter „Installing auxiliary heater“

15 -

Bolt

q

2x

q	Tightening torque 20 Nm

q	Heed tightening sequence → Chapter „Installing auxiliary heater“

16 -	Heater coolant shut-off valve -N279-

q	Fitted in the plenum chamber on the right

q	Removing and installing → Chapter

q	Operation → Chapter

q	Different versions for Audi A5 Coupé, Audi A4 and Audi Q5; pay attention to correct assignment → Electronic parts catalogue.

t	To stop the flow of coolant from the cylinder head being completely interrupted with the engine running and -N279- actuated, certain vehicles are fitted with a non-return valve in the coolant circuit → Chapter

t

On the Audi Q5, actuation of -N279- is only permissible up to a certain engine speed (currently up to approx. 1200 rpm). Attention is therefore to be paid to the correct version, encoding and adaption of the auxiliary heater → Vehicle diagnostic, testing and information systemVAS 5051/, “Guided fault-finding function”.

17 -

Holder

q	For heater coolant shut-off valve -N279-

q	Tightening torques of bolts/nuts (for attaching heater coolant shut-off valve -N279- to holder and holder to vehicle) 8 Nm in each case

View “2”   Note Refer to view “1” for all components not mentioned.

1 -	Control line connector

q	Attached to the holder “2” with a clip

2 -	Power supply connector

q	Attached to the holder “2” with a clip

3 -

Bolt

q	Tightening torque 6 Nm

q	For holder of circulation pump -V55-

q	Self-tapping bolt with coating, replace

q	A rubber grommet is fitted as isolator between the bolt and holder → Anchor

4 -

Bolt

q	Tightening torque 6 Nm

q	For exhaust silencer

5 -	Circulation pump -V55-

q	Removing and installing → Chapter

6 -

Bolt

q	Tightening torque 3.5 Nm

q	For circulation pump -V55- retaining clip

7 -	Retaining clip

q	For circulation pump -V55-

8 -	Holder “2”

q	Holders “1” and “2” are bolted together → Anchor

9 -	Bonded rubber bush

Auxiliary heater holders on the Audi Q5   Note t  The holders for the auxiliary heater were gradually modified on the Audi Q5 in Model Year 2009. Pay attention to the correct assignment when replacing the auxiliary heater and holders → Electronic parts catalogue and → Anchor. t  This illustration shows the auxiliary heater holder fitted at the start of production in Model Year 2009. For the differences with respect to the holder gradually introduced in Model Year 2009 following conversion, refer to → Anchor. 1 -  Holder “1” 2 -  Nut - tightening torque 8 Nm 3 -  Holder “2” 4 -  Bushing 5 -  Socket