Vehicle Interior Forced Air Extraction, Checking
Depending on the vehicle version, the airflow from the vehicle interior into the luggage compartment is routed differently.
The Audi TT Roadster vehicle interior is ventilated via the luggage compartment openings -B-, which are built into the convertible top compartment trim -A-. The air then flows from the luggage compartment to the forced air extraction vent frames via the openings in the luggage compartment side trim panels -C and D-.
The Audi TT Coupe vehicle interior is ventilated via the openings in the area between the rear shelf -A-, the luggage compartment side trim panels and the rear lid.
The air then flows from the luggage compartment into the luggage compartment side trim panels -B- and -C- via the openings on the Audi TT Coupe (there are different versions; here the luggage compartment side trim panel leads to the forced air extraction vent frames).
Depending on the vehicle version, there is different airflow routing and forced air extraction vent frames. Two vent frames -A- (on the left and right) are installed on the Audi TT.
Vent Openings in Luggage Compartment, Checking, Audi TT Roadster:
-- Check the airflow through the built-in vent openings in the luggage compartment side trim panels -C and D- on the left and right sides.
-- Check the airflow through the left and right openings -B- that are built into the convertible top compartment trim -A-.
Blocked or plugged vent openings -B- in the convertible top compartment trim -A- or in the luggage compartment side trim panels -C and D- or plugged air ducts (behind the luggage compartment side trim panels) can cause the vehicle windows to fog up.
Blocked or plugged forced air extraction vent frames -A- can cause the vehicle windows to fog up.
Vent Openings in Luggage Compartment, Checking, Audi TT Coupe:
-- Check the airflow through the built-in vent openings in the luggage compartment side trim panels -B and C- on the left and right sides.
Blocked or plugged vent openings in the luggage compartment side trim panels -B and C- or plugged air ducts (behind the luggage compartment side trim panels) can cause the vehicle windows to fog up.
Blocked or plugged forced air extraction vent frames -A- can cause the vehicle windows to fog up.
Forced Air Extraction Vent Frames, Checking (All Vehicles):
The following illustrations show the layout in the Audi TT Coupe. The information regarding checking and the test itself also applies to the Audi TT Roadster with slight deviations.
There is currently no cap in the left luggage compartment side trim panels on the Audi TT. Depending on the version, a removable vent grille may be installed in order to check the sealing lips -C- of the left vent frame. For a vehicle with a left luggage compartment side trim panel without a removable vent grille, the sealing lips -C- can only be checked from the inside with the luggage compartment side trim panel removed. Luggage Compartment Side Trim Panel, Removing. Refer to OVERVIEW - LUGGAGE COMPARTMENT SIDE TRIM PANEL .
There is currently no cap in the right luggage compartment side trim panels on the Audi TT. Therefore the sealing lips -C- on the vent frames can only be checked from the inside with the luggage compartment side trim panel removed.
For vehicles without a cap in the luggage compartment side trim panel, the function of the sealing lips -C- can also be checked from the outside with the tail lamps removed (from above using a mirror or an endoscope, if the bumper cover -B- is installed). Tail Lamps, Removing. Refer to TAIL LAMPS .
Stuck sealing lips -C- can cause the vehicle windows to fog up.
The sealing lips -C- in the vent frame -A- must move freely and close by themselves.
Due to additional built-in components, blocked or plugged air ducts (between the luggage compartment side trim panels and the vehicle body) to the vent frames -A- can cause the vehicle windows to fog up.
-- Make sure the vent frames -A- are not obstructed and check the function of the sealing lips -C-.
-- If the vehicle interior ventilation is to function properly, the vent grilles installed in the luggage compartment side trim panels -B- and -C- must not be blocked.
- The air must be able to flow via the vent grilles -B and C- installed in the luggage compartment side trim panels to the forced air extraction vent frames and then from there outward.