Audi Q7 2007 Repair Manual page 68

Audi Q7 2007 ➤
Heating, Ventilation and Air Conditioning - Edition 04.2013
– Allow a little bit of gas from the lighter flow past -B- from the
top area -A- of the Air Quality Sensor - G238- .
Note
If the Air Quality Sensor - G238- comes in contact with ciga‐
♦
rette smoke or with gas from an igniter, it will react since igniter
gas is heavier than air, therefore remove the Air Quality Sen‐
sor - G238- .
There are different versions of the Air Quality Sensor - G238- ,
♦
each with different functions. Make sure the allocation is cor‐
rect. Refer to the Parts Catalog.
– Read the display with the Air Quality Sensor - G238- measured
value and the recirculating/fresh air flap position. Use the Ve‐
hicle Diagnostic Tester via the "Guided Fault Finding" function.
♦ The specified value for the recirculating and fresh air flap po‐
sition changes from fresh air or partial recirculation mode
when there is a request for "automatic recirculation mode".
The request is fulfilled (the A/C system switches to recircula‐
tion mode).
– Wait a short period time (approximately one minute, depend‐
ing on amount of test gas sprayed in sensor).
– Read the display with the Air Quality Sensor - G238- measured
value and the recirculating/fresh air flap position. Use the Ve‐
hicle Diagnostic Tester via the "Guided Fault Finding" function.
♦ The specified value for the recirculating/fresh air flap position
changes from recirculation mode to fresh air or partial recir‐
culation mode (no request for "automatic recirculation mode"
present, A/C system in fresh air or partial recirculation mode).
Note
In order to avoid frequent shifting of the recirculating air/fresh air
door, the requirement of sensor for "Automatic air recirculation"
mode remains for at least 25 seconds (minimum duration period),
even if the pollutant concentration is so far reduced that recircu‐
lating air mode is no longer necessary.
– Operate the switch for wiper/washer system until the Wind‐
shield Washer Pump - V5- has delivered fluid for approxi‐
mately two seconds.
– Read the display with the Air Quality Sensor - G238- measured
value and the recirculating/fresh air flap position. Use the Ve‐
hicle Diagnostic Tester via the "Guided Fault Finding" function.
♦ Specified value: Request for "Recirculating Air Mode" due to
washer/wiper system, A/C system switches for approximately
10 seconds to the air recirculating mode.
– Wait briefly.
– Read the display with the Air Quality Sensor - G238- measured
value and the recirculating/fresh air flap position. Use the Ve‐
hicle Diagnostic Tester via the "Guided Fault Finding" function.
♦ Specified value: no request for "automatic recirculating air
mode" present, A/C system in fresh air or partial recirculating
air mode.
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Rep. Gr.87 - Air Conditioning
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with respect to the correctness of information in this document. Copyright by AUDI AG.