Removing and installing additional heater — AUDI

Switch ignition off.
Release the end piece of the exhaust pipe -A- of additional heater by removing the screws -B- from the noise insulation -C-.
Remove the noise insulation.

=> General Body Assembly, Exterior; Repair group 50; Body front; Noise insulation - assembly overview

Release pressure in coolant circuit by opening cap on coolant expansion tank.
Remove the engine air intake pipe if necessary.

=> Relevant Engine Workshop Manual, Mechanical Components

Remove the cover -2- of the engine mount

=> Relevant Engine Workshop Manual, Mechanical Components; Repair group 10

Notes:

Given that only the cover is removed, the engine continues to rest on the mount.

Should another engine mount be installed, which does not allow removal of the additional heater with the engine mount installed due to its size, this mount must be completely removed.

=> Relevant Engine Workshop Manual, Mechanical Components; Repair group 10

Remove the fresh air intake duct for the heater in the engine compartment

=> Heating, Air Conditioning; Repair group 80
Heating, Air Conditioning

Clamp the coolant hoses -A- (from the engine to the additional heater) and -B- (from the additional heater to the air-conditioner/heater heat exchanger) using hose clamps (e.g. the V.A.G 3094).

Mark the layout of the coolant hoses -A- and -B-to the additional heater.
Detach the coolant hoses -A- and -B- from the coolant pipes -C- and -D-.
Detach the fuel line -E- from the additional heater and seal it.

Remove the intake silencer -C-.
Detach the additional heater from the vehicle by removing the hexagon nut (bolt) -A- and the bolts -B-.
Carefully pull the additional heater towards the engine.

Detach connectors -A- and -B- from the heater unit.
Remove additional heater upwards.

Installation notes:

After installing, check the exhaust pipes, the coolant hoses, fuel line and wiring to the additional heater, they must not touch any other components.
Bleed coolant circuit before starting up additional heater (also before starting up via the "Basic setting" function) =>Page
82-48
If additional heater has been replaced, enter year of initial commissioning of the newly installed heater on heater rating plate and on new "duplicate rating plate" (by deleting year of original initial commissioning).

Check the installation location of spacers -A- on the exhaust gas corrugated pipe -B-, they must be fitted so that they prevent the pipe hitting against other components.
Check the additional heater exhaust pipe end piece -C- prior to installation of the noise insulation, a thermal insulation -D- must be fitted.

The rubber elements -A- are installed on the additional heater bracket at the body mounting points to serve as noise insulators. The rubber elements must be installed in the bracket in such a manner, that the metal ring -B- is positioned between the body and the bracket.
Securing of the additional heater bracket on the body is dependent on the body version:

using hexagon bolts with washer -C- and bushings -D-.

using special hexagon nuts -E- with washer -F-.

or

using hexagon nuts -G-, washers -H- and bushings -D-.