Removing and installing heating — AUDI

Removing

Place covers over driver's and passenger's seats.
Switch on ignition.
Set rotary air-distribution switch to defrost setting.
Heater air duct to windscreen and flaps for dash-panel vents closed.

Removing centre console:

=> General body repairs, Interior; Repair group 70; Dash panel; Removing and installing centre console and handbrake lever trim
General body repairs, Interior
Dash panel
Removing and installing centre console and handbrake lever trim

Pay attention to/ask customer for code on vehicles with coded radio.
Disconnect earthing strap at battery with ignition switched off.
Removing dash panel:

Removing airbag control unit:

=> Electrical system; Repair Group 96; Removing and installing airbag control unit.
Electrical system
Removing and installing airbag control unit.

Removing heater control =>Page
80-28
.

Remove bracket -A-.
Remove plenum chamber cover.
Detach cover for E-box/plenum chamber connection point.

Note:

On RHD vehicles, remove E-box/plenum chamber connection point.

Detach connector to pump valve unit.
Removing intake duct with air flow flap => Page
80-8
.
Detach all air ducts to heater.
Removing windscreen wipers and cowl panel trim:

=> Electrical system; Repair Group 92; Servicing windscreen wipers
Electrical system
Servicing windscreen wipers

=> Electrical system; Repair Group 92; Servicing windscreen washer system
Electrical system
Servicing windscreen washer system

Removing reinforcement plate (plenum chamber) =>Page
80-21
.

Open cap on coolant expansion tank.
Place collector V.A.G 1306 below engine.
Drain coolant circuit:

=> Engine Mechanical Components; Repair Group 19
Engine Mechanical Components

Mark positions of coolant hoses -A- and -B-.
Detach coolant hoses -A- and -B- from engine to pump valve unit.

Note:

Fig shows 8-cylinder engine arrangement.

Hold coolant hose -A- over a vessel.
Use compressed-air gun to carefully blow coolant out of pump valve unit and heat exchangers by way of coolant hose -B-.

Note:

To ensure that coolant is blown out of both heat exchangers, alternately pinch off upper coolant hose to one of the two heat exchangers.

Mark coolant hoses -A- and -B-.
Detach coolant hoses from pump valve unit to heat exchangers at coolant pipes.
Detach connectors to heater.
Disconnect condensate drain hoses from heater.

Screw out bolts -A- (in passenger compartment).
Unscrew nuts -B- (in passenger compartment).
Remove heater towards passenger compartment.

Installing

Installation is carried out in the reverse order to removal, noting the following:

Notes:

Replace seals and gaskets.
Secure all hose connections with hose clamps of latest design:

=> Parts list

Check for proper connection of damper element -C-.
Ensure proper connection of coolant hoses to heat exchanger:
Lower hose = coolant feed

Upper hose = coolant return

Replace gasket -A- between plenum chamber and heater.

Note:

When inserting heater take care not to jam the wiring to the positioning motors (in plenum chamber) or damage gasket -A- at stud bolts.

Connect coolant hoses to engine, paying attention to markings.
Checking cooling systems for leaks before installing side trim

=> Engine Mechanical Components; Repair Group 19
Engine Mechanical Components

Notes:

Coolant circuit must be bled before starting up coolant circulation pump -V50 of pump valve unit.
Dry running of the pump valve unit will destroy it.

Bleed coolant circuit before attaching two-way connector to pump valve unit

=> Engine Mechanical Components; Repair Group 19
Engine Mechanical Components

Following installation, check correct positioning of sleeve between engine compartment and plenum chamber.
Checking proper connection of condensate drain hoses at heater => Page
80-45
.