Audi Q7 2007 Repair Manual page 207

– Check fresh air intake shaft of A/C system, plenum chamber
and the water drain valves installed there and clean them if
necessary (only on front A/C unit). Refer to
⇒ "5.3 A/C System Fresh Air Intake Shaft, Removing and In‐
stalling", page 55 .
– Remove dust and pollen filter and check it for odor and con‐
tamination. Refer to
⇒ "9.35 Dust and Pollen Filter, Removing and Installing", page
169 .
Note
On this vehicle, the dust and pollen filter is installed between the
Fresh Air Blower - V2- and evaporator in the front A/C unit, there‐
fore it must be removed for the cleaning.
– Clean the installation compartment for dust and pollen filter of
the front A/C unit of leaves, dust and other contaminants. Re‐
fer to
⇒ "9.35 Dust and Pollen Filter, Removing and Installing", page
169 .
– Reseal the opening on the A/C unit through which dust and
pollen filter was removed.
– Start the engine.
– Set the operating mode "recirculated air mode" on the Clima‐
tronic Control Module - J255- front A/C control head and switch
off the compressor "Econ mode".
– Open the instrument panel vents (and vents in "B" and "C"
pillars, if present) and set the lowest possible temperature for
driver's and front passenger's sides (for example, temperature
preselect "Lo" for front and rear) on the Climatronic Control
Module - J255- front A/C control head (and on the Rear A/C
Display Control Head - E265- ).
– Close the windows and the sunroof.
– Set the Climatronic Control Module - J255- front A/C control
head (and Rear A/C Display Control Head - E265- ) to lowest
fresh air blower speed and select the front "instrument panel
vent" for air vent direction (set the Rear A/C Display Control
Head - E265- to operating mode "Auto").
Cleaning
– Shake the bottle of Cleaning Treatment - VAS6189/1- and fill
the Ultrasound A/C Cleaner - VAS6189A- with it while follow‐
ing the operating instructions that come with the Ultrasound A/
C Cleaner - VAS6189A- .
– Place the Ultrasound A/C Cleaner - VAS6189A- in passenger
side footwell.
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– Start up the Ultrasound A/C Cleaner - VAS6189A- (according
with respect to the correctness of information in this document. Copyright by AUDI AG.
to operating instructions) and route the outlet hose belonging
to it so that the vapor escaping via the recirculated air opening
of the front A/C unit (beneath instrument panel in front pas‐
senger's footwell) is drawn in by the Fresh Air Blower - V2- .
Heating, Ventilation and Air Conditioning - Edition 04.2013
Audi Q7 2007 ➤
10. A/C System Evaporator, Cleaning
201