BMW 3 (E46). Manual — part 279
640-1
General
The repair information given under this
heading applies to the heating and air
conditioning system. Many of the
procedures require that the A/C
refrigerant charge be evacuated. See
A/C system warnings and cautions
later in this repair group.
For information on the engine cooling
system, see
170 Radiator and
Cooling System
.
Special tools
Some special tools are necessary for
heating and A/C repair procedures.
A variety of A/C system evacuation and
recharge equipment is available.
Follow the equipment manufacturer's
recommendations and instructions.
Plastic tool for prying off interior trim
BMW 00 9 321
IHKA control panel removal tools BMW
64 1 010
A/C line plug kit BMW 64 5 100
Note:
A/C system recharging procedures are
beyond the scope of this manual.
Integrated heating and cooling
system (IHKA)
The E46 integrated automatic climate
control system (IHKA) offers powerful
cooling and heating, effective
ventilation, and smooth operation in
A/C mode.
The E46 IHKA design includes the
following:
Use of R134a refrigerant only
Single heater core for temperature
regulation
Maximum heating and cooling for
defroster functions
Rear window defogger operation
integrated into the heating/cooling
system
Blower controlled through a final
stage variable resistor
Road speed dependent air
distribution and fresh air volume
Self-calibrating air distribution
stepper motors controlled via
M-bus
Fresh air microfilter system
Electronically regulated A/C
compressor
Heater control personalization via
Car Memory/Key Memory
E46 IHKA control
Control panel and module
Heating and air conditioning functions
are programmed via the center console
mounted control panel. The control
panel has large, easy to use soft-touch
controls, an LED display and a single
temperature setting.
1 - Manual air distribution control
buttons
2 - Interior temperature sensor
intake/outlet
3 - LCD matrix
4 - A/C control (“snowflake”)
5 - Windshield defrost control
6 - Rear window defogger control
7 - Recirculation control
8 - Blower control
9 - Temperature control
10 - Automatic air distribution
The IHKA control module, integral with
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