BMW 3 (E46). Manual — part 281
Maximum defrosting
Pressing the defrost button turns on
maximum defrost functions:
Fresh air distribution valves are
opened.
Recirculation valves are closed.
Windshield defrost vents are
opened.
All other air distribution vents are
closed.
Blower runs at maximum speed.
Rear window defroster is switched
on.
Note:
When windshield defrosting is turned on,
the A/C compressor does not run
automatically, although it can be turned
on manually.
Air distribution control via M-bus
Five stepper motors control fresh,
heated and air conditioned air
distribution.
1 - Face vent
2 - Defrost
3 - Footwell
4 - Recirculation
5 - Fresh air
Two different types of air distribution
motors are used in the system. Fast
acting motors (A) are used for the fresh
air/recirculation flaps. (Right side
shown.)
-
Slower acting motors (B) are used
for the other operations.
The center dashboard air outlet
distribution motor (arrow) allows
ventilation air temperature to be
controlled by the driver or passenger.
When fresh air is selected, the fresh air
inlet distribution flaps are positioned
according to road speed and blower
motor speed. The motors close the air
inlet flaps incrementally according to
road speed but the motion is dampened
to avoid closing and opening continually
due to slight speed changes.
IHKA personalization
Car Memory/Key Memory allows various
functions and features of IHKA control to
be tailored to the driver's wishes. The
functions of IHKA that can be
programmed by the driver include:
Automatic activation of recirculation
when the vehicle is started
Blower speed adjustment (8-speed
blower)
Automatic opening of ventilation
flaps with warm coolant
Automatic closing of footwell flaps
with A/C activation
Automatic closing of defroster flaps
with A/C activation
Adjustments to set temperature
Automatic activation of compressor
control when the ignition is switched
on
Auto program for blower control
when the ignition is switched on
These features are programmed using
the coding/programming function of the
DIS/MoDiC.
Note:
See
515 Central Locking and Anti-theft
for an explanation of Car Memory/Key
Memory.
Automatic air recirculation
As of model year 2000, automatic
recirculation control is available. This
system uses an air quality sensor (AUC)
(arrow), located at the top right corner of
the radiator, to detect high levels of air
pollution and automatically switch the
IHKA to recirculation of interior air. The
recirculation button on the IHKA control
panel can be toggled to allow automatic,
manual or no recirculation.
Once recirculation is turned on, it runs
until it is turned off using the button.
Once the ignition is turned off, the
recirculation setting is saved for 15
minutes, after which the IHKA system
reverts to fresh air mode. This feature
can be over-ridden using the Car
Memory feature, so that recirculating
interior air is automatically selected on
engine start-up.
Fresh air micro filter system
A fresh air micro filter system is used in
all E46 models. The filter is housed
below the fresh air inlet at the rear of the
engine compartment. The filter can be
serviced by releasing three-quick release
screws and removing a plastic cover.
Service
The heating system is part of the engine
cooling system and is sealed. The only
required service is periodic coolant
flushing. See
170 Radiator and
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