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.
Passenger Compartment Forced Air Extraction, Checking
Depending on the vehicle version, there is different airflow routing from the passenger compartment into the luggage compartment.
On the A3 Sedan, the passenger compartment is ventilated via a gap in the area between the rear shelf -A- and the window cross member for the rear window. For this there are openings in the rear panel upper section -B-, from which the air from the passenger compartment enters the luggage compartment.
The air then flows from the luggage compartment via the openings into the luggage compartment side trim panel -C- (different versions, the Audi A3 Sedan luggage compartment side trim panel is shown here) to the forced air extraction vent frame.
On the Audi A3 Cabrio the passenger compartment ventilation takes place via the area -A- (on the air ducts C) in the convertible top compartment.
Over the convertible top compartment part of the air is directed in the area -B and C- in the luggage compartment and over the opening in the luggage compartment side trim panel -A and D- to the forced air extraction vent frame from the luggage compartment. The other parts of the air flow behind the luggage compartment side trim panel to the forced air extraction vent frame.
Depending on the vehicle version, there is different airflow routing and forced air extraction vent frames. Refer to the Parts Information. For example, a ventilation frame -A- is installed on the Audi A3 and A3 Sportback. Ventilation frame -B- is installed on the Audi A3 Sedan and the Audi A3 Cabrio.
The following illustrations show components as they are installed on the Audi A3 and A3 Sportback. On other vehicle version (for example the Audi A3 Sedan and the Audi A3 Cabrio) the arrangement varies.
Checking the Ventilation Opening in the Luggage Compartment
-- Check the left and right air guides through the vent openings -arrow- built into the luggage compartment side trim panel -1-.
Closed or blocked air ducts to the forced air extraction ventilation frames can cause the vehicle windows to fog up.
Check Forced Air Extraction Vent Frames from Inside
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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.