Blower Control; Regulated A/C Compressor - BMW 1999-2005 M3 Service Manual

Heating and Air Conditioning
6 of 22
http://ebahn.bentleypublishers.com/BMW/3/E46/Repair%20Manuals/6...
Solar sensor input (if applicable)
A rocker switch is used to select the
desired cabin temperature, shown in the
display matrix of the control panel. The
range for temperature display is from 15°
to 32°C (60° to 90°F).
A "service station" feature is integrated
into the E46 IHKA. This prevents the
heater core from being flooded with hot
coolant when refueling the vehicle.

Blower control

The blower rocker switch on the IHKA
control panel is the master switch for the
entire system. Rocking the switch to
select slower and slower fan speeds
eventually results in the following:
Blower motor turns off.
All air distribution valves are closed.
LED and LCD displays are switched
off.
Rear window defroster is switched
off.
A/C compressor is switched off.
Even in the lowest setting, the interior
temperature sensor blower continues to
operate and the IHKA control panel
continues to signal the heater water
valve for heat.

Regulated A/C compressor

2/25/2009 11:16 PM