Alfa Romeo 156 GTA Owner's Manual page 104

To ensure correct opera-
tion of the incipient misting
sensor, stickers (e.g. road
licence holder) must not be applied
in the "control" area between the
sensor and the windscreen. For this
very reason, both the sensor and
the windscreen must always be
kept clean, to avoid accumulation
of dirt or other substances.
IMPORTANT The demisting procedure
is enabled every time the ignition key is
turned to MAR, or pressing the
ton. When this procedure is working it can
be turned off pressing one of the following
buttons: compressor, air recirculation, air dis-
tribution, air flow. This operation inhibits the
incipient misting sensor signal until the
button is pressed again or the next
AUTO
time the ignition key is turned to MAR.
The system is integrated by an anti-pollu-
tion sensor that is able to switch on the in-
side air recirculation function automatical-
ly, to reduce the unpleasant smell of polluted
air when driving in urban areas, queues, tun-
nels, and when the windscreen wash/wiper
is operated (with the typical smell of spir-
its).
IMPORTANT The function of the anti-
pollution sensor is subordinate to safety con-
but- ditions; therefore disabling the climate con-
AUTO
trol compressor or at an outside temperature
below 4°C, the sensor is disabled. In any
case, the sensor can be re-enabled press-
ing the recirculation button v until taking
it to the automatic mode.
The anti-pollution sensor
is placed in the air flow in
front of the combined par-
ticle activated carbon filter and,
therefore, must be protected
against possible compressed air
jets produced by cleaning equip-
ment. Moreover, the water col-
lected from the windscreen wipers
should not come into contact with
the sensor: otherwise, the internal
air recirculation function could be
disabled for long periods.
103