Passenger Compartment Forced Air Extraction, Checking
The following is a test for the forced air extraction on an Audi A5 Coupe. On other vehicles such as the Audi A5 Sportback, Audi A4, Audi Q5 etc, the location of the components may differ, but removing and installing the components is identical.
On the Audi A4 sedan, the passenger compartment is ventilated by an opening between the rear window -B- and the rear shelf -A- (in the body) into the luggage compartment. The air is guided through the ventilation openings -C- in the space between the body and the luggage compartment trim -D-.
On the Audi A4 Avant and the Audi Q5 the air is routed via the left and right sides in the vent grille -A- installed in the side trim panel near the back of the luggage compartment side trim panel. From there the air flows to the ventilation frame -B-.
When the roof is closed on the Audi A5 Cabrio, for example, over the openings near the rear shelf -A- (behind the head restraints -B-), the air is guided through the safety belt guides -C- and through the roof trim -D-.
The passenger compartment on the Audi A5 Cabrio is ventilated the same way as on the other vehicles when the roof is closed. There are ventilation slots -C- in the luggage compartment trim panel -B-, which guide the air to the ventilation frame for forced air extraction -A-.
One vent frame -A- is installed in the body vent opening -C- on the left and the right for the forced air extraction.
The forced air extraction vent frames -A- are removed and installing from the outside (with the bumper cover removed).
There are different versions of the vent frame for the forced air extraction -A- on vehicles with and without noise insulation -D-. Installing the noise insulation -D- depends on the version of the vehicle .
For vehicles with a high voltage system (hybrid vehicles), the Auxiliary Battery -A1- might need to be removed so that the left noise insulation cover -D- can be reached. Refer to Battery -A-, REMOVING AND INSTALLING, VEHICLES WITH HIGH VOLTAGE SYSTEM .
Checking the Ventilation Openings in the Luggage Compartment Trim Panel
-- Check the air routing through the vent frames for the left and right luggage compartment trim panels -C- and behind the luggage compartment trim panel (left and right) to both vent frames -A- to make sure they are not blocked.
To ensure proper passenger compartment ventilation, the left and right ventilation frames -C- in the luggage compartment trim panel must not be blocked.
Obstructed ventilation frames in the luggage compartment trim panels -C- or obstructed vents in the ventilation frames -A- can cause the windows to fog up.
The illustration shows the luggage compartment on an Audi A5 Coupe. On the Audi A5 Sportback, the Audi A4, the Audi Q5, the location of the components may differ.
Check forced air extraction vent frames from inside:
-- Remove the luggage compartment trim panel covers (left and right). Refer to OVERVIEW - LUGGAGE COMPARTMENT SIDE TRIM PANEL .
-- Make sure the left and right ventilation frames -A- are not obstructed.
Sealing lips -B- in vent frames -A- must move freely and close by themselves, stuck sealing lips -B- can cause windows to fog.
On vehicles equipped with noise insulation -D-, make sure the air vent under the noise insulation -arrow- leading to the ventilation frame -A- is not obstructed by objects.
Closed or plugged air ducts to the vent frames -A- can cause windows to fog.
To ensure sealing lips -B- close correctly, vent frame -A- must be installed on the correct side.
Check forced air extraction vent frames from the outside:
-- Remove the rear bumper cover. Refer to Rear Bumper .
-- Make sure the left and right ventilation frames -A- are not obstructed and that the sealing lips -B- function properly.
Stuck sealing lips -B- can cause windows to fog.
The ventilation frames -A- can only be installed in one position to ensure the sealing lips -B- close correctly.
In this illustration, ventilation frame -A- is depicted with rear bumper cover removed.