Air Distribution Control

AIR DISTRIBUTION CONTROL

Air distribution on the IHKA E39 is controlled through five stepper motors and a bowden cable. The five stepper motors include:







Stratified Air

The stratified face vent function is adjusted with a bowden cable as on the E36 IHKA system. The stratified air output is only possible at the center face vents. The system operates the same as the stratification flap on the E36 - IHKA system.

The cable manipulates the stratification flap in the IHKA housing allowing cold air to flow into the face vent air ducts mixing with heated air.

- As of production 9/97 stratified air is available from the console rear outlet.
- This caused a housing change (similar to E38) and an additional stepper motor.
- The thumbwheel to the left of the outlet operates an on/off switch for airflow control.


NOTE: From production date 9/97 to 3/98 the rear compartment flap motor assumes the COLD position when the switch is closed. As from production date 03/98, the flap moves in the WARM direction in order to avoid draughts in the event of flap leaking.


- An additional thumbwheel to the right of the outlet allows rear seat passengers to vary air discharge temperature as well.







The console outlet is almost always open when the IHKA system is "on" and the rear seat passengers request air flow. An exception is during windshield defrosting (and maximum defrost mode) when the console outlet flap is fully closed.

The same flap and stepper motor, located on the IHKA E39 housing assembly, performs both the open/close and temperature control functions for the console outlet.







The stepper motor is operated by the control panel/module using information from the console rear outlet thumbwheels and the control panel/model buttons (left air distribution only).