Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSAUDI1998A8 SEDAN (4D2) V8-3.7L (AEW)REPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGDESCRIPTION AND OPERATIONAIR DISTRIBUTION, SCHEMATIC DIAGRAM
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)
Air Distribution, Schematic Diagram
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)SECTION Air Distribution, Schematic Diagram
I - Engine compartment (plenum)
II - Passenger compartment
III - Air conditioner
A - Dust and pollen filter
- Installed in front flap
B - Fresh air blower -V2-
C - Evaporator
D1 - Left heater core (driver side)
D2 - Right heater core (passenger side)
E1 - Left mixing chamber
E2 - Right mixing chamber
F - Air guide to center air outlet at rear
G1 - To left footwell air outlets
- Driver and rear footwell
G2 - To right footwell air outlets
- Passenger and rear footwell
H1 - To left instrument panel air outlet and to B-pillar left air outlet
H2 - To right instrument panel air outlet and to B-pillar right air outlet
J - To defroster outlets
K - To center instrument panel air outlet
L - Air intake duct for recirculating air mode
1 - Airflow flap motor -V71-
- Flap closes completely in recirculating air and ACF mode and also partially at higher speeds (program-controlled)
2 - Recirculation flap motor -V113-
- Flap opens in recirculating air mode
3 - Center vent adjusting motor -V102-
- Flap can be opened or closed by adjusting potentiometer in center air outlet -G142 (program-controlled)
- If flap is open, cold air is blended with air flowing out of center instrument panel outlets
4 - Temperature regulator flap motor -V68-
- Flap can be opened or closed by adjusting center vent position sensor -G142- (program-controlled)
- If flap is closed, only cold air flows out of center instrument panel air outlets (See item 3)
5 - Defroster flap motor -V107-
6 - Left footwell flap motor -V105-
7 - Right footwell flap motor -V109-
8 - Left center vent motor -V110-
9 - Right center vent motor -V111-
10 - Rear footwell vent motor -V112-
11 - ACF flap motor -V114-
- In preparation
12 - Left vent temperature sensor -G150-
13 - Left vent temperature sensor -G150-
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.