Removing And Installing Dust And Pollen Filter; Dust And Pollen Filter With Activated Charcoal Filter Element - Audi Air conditioning 2003 A8 Workshop Manual

5.2 Removing and installing dust and pollen
filter
Note
Replacement interval for dust and pollen filter ⇒ Maintenance
♦
tables
The filter element has an activated charcoal layer acting as
♦
integrated odour filter.
Clean the plenum chamber after replacing the dust and pollen
♦
filter. Pay particular attention to the area beneath the air con‐
ditioning unit.
Clean the area around the dust and pollen filter before fitting
♦
a new filter.
– Remove the plenum chamber cover on the left and right.
– Release the clamping pins -A- by turning through 180° and
detach the cover -B- with the dust and pollen filter -C-.
– Take the dust and pollen filter -C- out of the housing.
5.3 Dust and pollen filter with activated char‐
coal filter element
♦ The dust and pollen filter with additional activated charcoal fil‐
ter element is fitted in addition to the air quality sensor -G238-
( ⇒ page 36 ).
♦ The filter with ACF layer continues to function as a dust and
pollen filter, but it is also designed to filter out gaseous pollu‐
tants such as ozone, benzene and nitrogen dioxide from the
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
air flow.
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
♦ The purpose of the activated charcoal is to absorb the gaseous
pollutants in the air flow until the fresh-air flap is closed and
the air conditioner is operating in air recirculation mode.
Switching from fresh-air to air recirculation mode is implemen‐
ted by the front operating and display unit, Climatronic control
unit -J255- as soon as the air quality sensor -G238- detects
gaseous pollutants in the ambient atmosphere (the „automatic
air recirculation" function must have been selected).
♦ The charcoal layer in the dust and pollen filter has a different
effect on the various pollutants in the air:
- Certain pollutants are bonded in the activated charcoal layer.
- Others are converted into harmless compounds as in a catalytic
converter.
- Otherwise, the activated charcoal acts as a condenser. As the
impact level increases, pollutants are initially absorbed until a
certain degree of saturation is attained. If the pollutant content
decreases, the activated charcoal layer continuously emits the
absorbed particles again.
5. Components for control and regulation of air conditioner not located in passenger compartment
Audi A8 2003 ➤
Air conditioning - Edition 09.2010
31