Heating, Ventilation: Overview Audi A3 8P facelift

AIR DISTRIBUTION HOUSING OVERVIEW

Note. To illustrate air guide in the air distribution housing, it is shown in the form of sectional views A - A and B - B. On the heater, the various doors for air distribution are moved together via a flexible shaft and various levers and two curved washers.

Scheme 129

1. Air Distribution Housing
2. Left Temperature Door (Driver Side) Shown in center position. Both left and right temperature doors are moved together at heater (separate adjustment for driver and front passenger not possible).
3. Air Guide To Air Guide Channel To Vent In Rear Center Console And To Center Instrument Panel Vents
4. Air Guide To Air Guide Channel To Vent In Rear Center Console And To Center Instrument Panel Vents
5. Right Temperature Door (Front Passenger Side) Shown in center position. Both left and right temperature doors are moved together at heater (separate adjustment for driver and front passenger not possible).
6. Left Footwell Door (Driver Side) Shown in closed position.
7. Air Guide Channel In The Driver Side Footwell
8. Air Distribution Housing Sectioned Above Line A - A
9. Auxiliary Air Heater Heating Element -Z35- (with Auxiliary Air Heater Control Module -J604-) The electric auxiliary air heater is available in different versions. On vehicles equipped with a diesel engine built through November 2006 (running change) the control of the auxiliary air heater heating element via the auxiliary air heater control module. Check using Vehicle Diagnosis, Testing and Information System VAS 5051 in "Guided Fault Finding" function. On vehicles with Diesel engine manufactured later than November 2006 (running change in production), a 3-stage auxiliary air heater heating element is installed, which is actuated via a relay by the respective Engine Control Module (ECM), refer to «TESTING AUXILIARY HEATER ACTIVATION, WITHOUT A/C»(ref-496069-S19912628022012082100000) and appropriate SYSTEM WIRING DIAGRAM. At this time, an auxiliary air heater heating element is also installed in vehicles with Diesel engine and parking heater as optional equipment. At a later point in time (not yet finalized), the auxiliary air heater heating element will be discontinued, then the parking heater undertakes the function of the auxiliary heater. Currently diesel and gasoline vehicles are not equipped with an auxiliary heater; the parking heater is not controlled like an auxiliary heater. Refer to Vehicle Diagnosis, Testing and Information System VAS 5051 under "Guided Fault Finding".
10. Heater Core For Heater Unit
11. Air Outlet From Air Guide Channel
12. Right Temperature Door (Front Passenger Side) Shown in center position.
13. Right Footwell Door (Front Passenger Side) Shown in closed position.
14. Defroster Door Shown in closed position. NOTE: Beginning November 2007, a heater air distribution housing with a door in the air outlet to the defroster vents in the instrument panel without a side cut-out is gradually being installed. On vehicles not equipped with A/C (just heating) or on vehicles equipped with a manual climate control system, this change has no impact on the heater control or on the manual A/C system (the flaps is operated by the heater controls and/or the manual A/C), refer to «AIR DISTRIBUTION HOUSING DEFROSTER OUTLET DOOR»(ref-496031-S04262121652012082100000) .
15. Air Distribution Housing Sectioned Above Line B - B
16. Central Door Center Shown in open position.
17. Door In Air Guide Channel To Air Guide To Vent In Center Console At Rear This door is operated via an actuating arm installed at center central door.
18. Air Guide Channel To The Air Guide For The Rear Center Console Vents This channel is currently sealed with a plug. Introduction of a vent in center console has not yet been finalized.

Scheme 130

1. Complete Air Guide Channel
2. Fresh/Recirculating Air Door Opening for air intake from plenum chamber (fresh air).
3. Opening For Air Intake In Recirculating Air Mode
4. Fresh Air Blower -V2
5. Dust and Pollen Filter Follow the replacement intervals, refer to «Maintenance, Diagnosis»(ref-496015-S28841274602012082100000) . As a replacement part, the dust and pollen filter is available in different versions (with and without activated charcoal element).
6. Noise Insulation In vehicles without A/C system (with heater only), a foam core piece is installed for noise insulation instead of evaporator.
7. Lower Section Of Air Guide Channel (With Installed Components)
8. Fresh Air Blower Series Resistor With Fuse -N24- Removing and installing, refer to «FRESH AIR BLOWER SERIES RESISTOR, MANUALLY REGULATED A/C SYSTEM»(ref-496069-S25399057542012082100000) .
9. Air Outlet To Air Distribution Housing
10. Air Distribution Housing NOTE: Beginning November 2007, a heater air distribution housing with a door in the air outlet to the defroster vents in the instrument panel without a side cut-out is gradually being installed. On vehicles not equipped with A/C (just heating) or on vehicles equipped with a manual climate control system, this change has no impact on the heater control or on the manual A/C system (the flaps is operated by the heater controls and/or the manual A/C), refer to «AIR DISTRIBUTION HOUSING DEFROSTER OUTLET DOOR»(ref-496031-S04262121652012082100000) .

Scheme 131

1. Instrument Panel With air ducts to defroster vents and instrument panel vents driver and passenger side. Removing and installing, refer to «Removal and Installation»(ref-496058-S22585871132012082100000)
2. Defroster Vent For front windshield. Removing and installing, refer to «Removal and Installation»(ref-496058-S22585871132012082100000) If the Intermediate piece between heater and air duct in the instrument panel has been pinched during installation, the air guide to the front windshield is uneven or insufficient. Refer to «Removal and Installation»(ref-496058-S22585871132012082100000) NOTE: Beginning November 2007, a heater air distribution housing with a door in the air outlet to the defroster vents in the instrument panel without a side cut-out is gradually being installed. On vehicles not equipped with A/C (just heating) or on vehicles equipped with a manual climate control system, this change has no impact on the heater control or on the manual A/C system (the flaps is operated by the heater controls and/or the manual A/C), refer to «AIR DISTRIBUTION HOUSING DEFROSTER OUTLET DOOR»(ref-496031-S04262121652012082100000) .
3. Defroster Vent Side window/passenger side. Removing and installing, refer to «Removal and Installation»(ref-496058-S22585871132012082100000)
4. Instrument Panel Vent, Right Removing and installing instrument panel vents, refer to and «Removal and Installation»(ref-496058-S22585871132012082100000)
5. Right Center Instrument Panel Vent Removing and installing instrument panel vents, refer to and «Removal and Installation»(ref-496058-S22585871132012082100000)
6. Left Center Instrument Panel Vent Removing and installing instrument panel vents, refer to and «Removal and Installation»(ref-496058-S22585871132012082100000)
7. Instrument Panel Vent, Left Removing and installing instrument panel vents, refer to and «Removal and Installation»(ref-496058-S22585871132012082100000)
8. Defroster Vent Side window/driver side. Removing and installing, refer to «Removal and Installation»(ref-496058-S22585871132012082100000)
9. Intermediate Piece / Defrost Canal Removing and installing, refer to «Removal and Installation»(ref-496058-S22585871132012082100000)
10. Fresh Air Intake Air is drawn in via plenum chamber.
11. Recirculating Air Intake The air is taken from the passenger footwell under the glove compartment.
12. Air Guide/Instrument Panel Vent To center vents at left and right. Removing and installing, refer to «Removal and Installation»(ref-496058-S22585871132012082100000)
13. Right Front Footwell Vent Removing and installing, refer to «Removal and Installation»(ref-496058-S22585871132012082100000)
14. Heater Controls/ Base Plate Removing and installing, refer to «HEATER CONTROLS»(ref-496069-S20638973832012082100000)
15. Trim Panel For Right Footwell Vent Removing and installing, refer to «Removal and Installation»(ref-496058-S22585871132012082100000)
16. Air Duct To Rear Right Footwell Vent Removing and installing, refer to «Removal and Installation»(ref-496058-S22585871132012082100000)
17. Air Guide To Vent In Rear Center Console Only in vehicles with vent installed in center console (introduction not yet finalized). Removing and installing, refer to «Removal and Installation»(ref-496058-S22585871132012082100000)
18. Plug Only in vehicles without air guide to vent installed in center console at rear.
19. Air Duct To Rear Left Footwell Vent Removing and installing, refer to «Removal and Installation»(ref-496058-S22585871132012082100000)
20. Trim Panel For Left Footwell Vent Removing and installing, refer to «Removal and Installation»(ref-496058-S22585871132012082100000)
21. Left Front Footwell Vent Removing and installing, refer to «Removal and Installation»(ref-496058-S22585871132012082100000)
22. Heater Unit Removing and installing, refer to «HEATER UNIT»(ref-496069-S13939046482012082100000) Heater Unit, disassembling and assembling, refer to «HEATER UNIT»(ref-496069-S36752268102012082100000)

Note. Beginning November 2007, a heater air distribution housing with a door in the air outlet to the defroster vents in the instrument panel without a side cut-out is gradually being installed. On vehicles not equipped with A/C (just heating) or on vehicles equipped with a manual climate control system, this change has no impact on the heater control or on the manual A/C system (the flaps is operated by the heater controls and/or the manual A/C), refer to AIR DISTRIBUTION HOUSING DEFROSTER OUTLET DOOR .

Scheme 132

1. Fresh Air Intake
2. Removing Air From The Passenger Compartment (In Recirculating Air Mode)
3. Outlet To Right Front Footwell Vent
4. Outlet To Right Instrument Panel Vent
5. Outlet To Center Instrument Panel Vents (Left And Right)
6. Outlet To Left Instrument Panel Vent
7. 7 - Outlet To Left Front Footwell Vent
8. Outlet To Defroster Vents (Instrument Panel) NOTE: Beginning November 2007, a heater air distribution housing with a door in the air outlet to the defroster vents in the instrument panel without a side cut-out is gradually being installed. On vehicles not equipped with A/C (just heating) or on vehicles equipped with a manual climate control system, this change has no impact on the heater control or on the manual A/C system (the flaps is operated by the heater controls and/or the manual A/C), refer to «AIR DISTRIBUTION HOUSING DEFROSTER OUTLET DOOR»(ref-496031-S04262121652012082100000) .
9. Outlet To Right Rear Footwell Vent
10. Outlet To Left Rear Footwell Vent
11. Outlet To Vent In Rear Center Console- Currently sealed with a plug. Introduction of a vent in center console has not yet been finalized.
12. Outlet To Vent In Rear Center Console Currently sealed with a plug. Introduction of a vent in center console has not yet been finalized.

Scheme 133

1. The indicator lamp in the fresh/recirculation button -F- will come one when air recirculation is selected (check the functionality of the fresh/recirculation air button -F-, refer to «HEATER CONTROL MODULE AND FRESH/RECIRCULATING AIR DOOR MOTOR, CHECKING»(ref-496069-S37270278882012082100000) ), Owner's manual and appropriate SYSTEM WIRING DIAGRAM.
2. By pressing fresh/recirculated air button -F-, recirculating air mode function is selected and indicator lamp in fresh/recirculated air button -F- lights up. By pressing button -F- again or switching ignition off, recirculating air mode function is switched off (motor is set to fresh air mode position after ignition is switched on). Refer to the Owner's manual.
3. So that fogged up windows can be defogged as rapidly as possible, recirculating air mode function is switched off a short time after rotary switch for air distribution -B- is set to position -D- air distribution to front windshield and switch-on indicator lamp in fresh/recirculated air button -F- goes out.

If air distribution is changed via rotary switch -B- e.g. to footwell, heater remains in fresh air mode.

Air recirculation mode is not switched off when rotary switch -B- is turned through position -D- air distribution to front windshield (e.g. out of position for air to instrument panel vents into position for air at top and bottom).

If rotary switch -B- is located in position -D- air distribution to front windshield, recirculating air mode function can be switched on via fresh/recirculated air button -F-.

INSTRUMENT PANEL OVERVIEW

1. 1 - Instrument Panel With air ducts to defroster vents and instrument panel vents driver and passenger side. Removing and installing, refer to «Removal and Installation»(ref-496058-S22585871132012082100000) .
2. 2 - Defroster Vent For front windshield. Removing and installing, refer to «Removal and Installation»(ref-496058-S22585871132012082100000) . If the Intermediate piece between heater and air duct in the instrument panel has been pinched during installation, the air guide to the front windshield is uneven or insufficient. Refer to «Removal and Installation»(ref-496058-S22585871132012082100000) . NOTE: Beginning November 2007, a heater air distribution housing with a door in the air outlet to the defroster vents in the instrument panel without a side cut-out is gradually being installed. On vehicles not equipped with A/C (just heating) or on vehicles equipped with a manual climate control system, this change has no impact on the heater control or on the manual A/C system (the flaps is operated by the heater controls and/or the manual A/C), refer to «AIR DISTRIBUTION HOUSING DEFROSTER OUTLET DOOR»(ref-496031-S04262121652012082100000) .
3. 3 - Defroster Vent Side window/passenger side. Removing and installing, refer to «Removal and Installation»(ref-496058-S22585871132012082100000) .
4. 4 - Instrument Panel Vent, Right Removing and installing instrument panel vents, refer to «INSTRUMENT PANEL VENT»(ref-496031-S35281215092012082100000) and «Removal and Installation»(ref-496058-S22585871132012082100000) .
5. 5 - Right Center Instrument Panel Vent Removing and installing instrument panel vents, refer to «INSTRUMENT PANEL VENT»(ref-496031-S35281215092012082100000) and «Removal and Installation»(ref-496058-S22585871132012082100000) .
6. 6 - Left Center Instrument Panel Vent Removing and installing instrument panel vents, refer to «INSTRUMENT PANEL VENT»(ref-496031-S35281215092012082100000) and «Removal and Installation»(ref-496058-S22585871132012082100000) .
7. 7 - Instrument Panel Vent, Left Removing and installing instrument panel vents «INSTRUMENT PANEL VENT»(ref-496031-S35281215092012082100000)
8. 8 - Defroster Vent Side window/driver side. Removing and installing, refer to «Removal and Installation»(ref-496058-S22585871132012082100000) .
9. 9 - Intermediate Piece / Defrost Canal Removing and installing, refer to «Removal and Installation»(ref-496058-S22585871132012082100000) .
10. 10 - Fresh Air Intake Air is drawn in via plenum chamber.
11. 11 - Recirculating Air Intake The air is taken from the passenger footwell under the glove compartment.
12. 12 - Air Guide/Instrument Panel Vent To center vents at left and right Removing and installing, refer to «Removal and Installation»(ref-496058-S22585871132012082100000) .
13. 13 - Right Front Footwell Vent Removing and installing, refer to «Removal and Installation»(ref-496058-S22585871132012082100000) .
14. 14 - Heater Controls / Base Plate Removing and installing, refer to «HEATER CONTROLS»(ref-496069-S20638973832012082100000) .
15. 15 - Trim Panel For Right Footwell Vent Removing and installing, refer to «Removal and Installation»(ref-496058-S22585871132012082100000) .
16. 16 - Air Duct To Rear Right Footwell Vent Removing and installing, refer to «Removal and Installation»(ref-496058-S22585871132012082100000) .
17. 17 - Air Guide To Vent In Rear Center Console Only in vehicles with vent installed in center console (introduction not yet finalized). Removing and installing, refer to «Removal and Installation»(ref-496058-S22585871132012082100000) .
18. 18 - Plug Only in vehicles without air guide to vent installed in center console at rear.
19. 19 - Air Duct To Rear Left Footwell Vent Removing and installing, refer to «Removal and Installation»(ref-496058-S22585871132012082100000) .
20. 20 - Trim Panel For Left Footwell Vent Removing and installing, refer to «Removal and Installation»(ref-496058-S22585871132012082100000) .
21. 21 - Left Front Footwell Vent Removing and installing, refer to «Removal and Installation»(ref-496058-S22585871132012082100000) .
22. 22 - Heating Removing and installing, refer to «HEAT EXCHANGER»(ref-496069-S13939046482012082100000) . Heater, disassembling and assembling «DISASSEMBLY AND ASSEMBLY»(ref-496069-S15264994232012082100000) . NOTE: Beginning November 2007, a heater air distribution housing with a door in the air outlet to the defroster vents in the instrument panel without a side cut-out is gradually being installed. On vehicles not equipped with A/C (just heating) or a manual A/C system, the change to this door has no impact. The door is controlled by the Climatronic Control Module -J255- whenever the heating or manual A/C system is adjusted. Refer to «AIR DISTRIBUTION HOUSING DEFROSTER OUTLET DOOR»(ref-496031-S04262121652012082100000) .