Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
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 activated charcoal layer in the dust and pollen filter is to
keep load peaks out of the passenger compartment.
♦ The activated charcoal also has the task of removing certain
gaseous contaminants from the air flowing through. The acti‐
vated charcoal layer in the dust and pollen filter reacts differ‐
ently to various pollutants in the air.
– Certain pollutants bond permanently in the active-carbon lay‐
er.
– Others are converted into noxious bonds like in a catalytic
converter.
– For the rest, the activated charcoal works as a condenser (ca‐
pacitor). With increasing load pollutants are absorbed, until a
certain saturation is reached. If the amount of pollutants de‐
creases, the activated charcoal layer continuously releases
the absorbed particles.
♦ Because a portion of the gaseous pollutant particles as well
as dust and pollen bond permanently to the activated charcoal
layer, it may be necessary for the following reasons to change
the dust and pollen filter earlier than planned on vehicles that
operate in areas with high levels of pollution:
– the activated charcoal layer in the dust and pollen filter is sa‐
turated faster than planned.
– a saturated filter can no longer absorb pollutants and the pol‐
lutants can flow through freely.
1.13
Evaporator, Cleaning with Ultrasound A/
C Cleaner
Tools required
♦ Ultrasound A/C Cleaner -VAS 6189- .
♦ Cleaning Fluid -VAS 6189/1-
Note
♦
There are many different methods for cleaning the evaporator
offered on the market. Currently Audi offers the -VAS 6189-
which has been approved and released for cleaning the evap‐
orator. If in the course of time additional procedures are tested
and approved by Audi, related information will be found in
“Audi ServiceNet“.
♦
Odors from the air conditioning system can be caused by var‐
ious things, only a portion of these orders come from the
evaporator and can be corrected by cleaning it with, for ex‐
ample, the -VAS 6189- .
Causes of Odor, refer to
⇒ “4.3 Causes of Odor“, page 89
.
Preparation
– Check whether odor is actually in A/C evaporator by switching
from fresh air to recirculation.
Note
The odor can only be removed by cleaning with the -VAS 6189-
if it originates in the evaporator.
– Check plenum chamber and water drain valves installed there
and clean them if necessary. Refer to
Audi TT 2007 ➤
Heating, Ventilation and Air Conditioning - Edition 01.2011
34
Rep. Gr.87 - Air Conditioning
