Air Distribution

IHKA E38 AIR DISTRIBUTION







The locations of E38 air distribution outlets are shown above. While flap operation strategies are similar to those on E31 vehicles, there are some significant differences.

A new input helps determine face vent flap positions - blower speed request position:

- The IHKA E38 control panel/module has separate blower request buttons for the driver and passenger, yet has only one blower motor assembly. Since the blower cannot run at two speeds at once, it always runs at the higher requested speed. For the side requesting the lower blower speed, the control module/panel partially closes the face vent flap to reduce air flow on that side of the vehicle.

- For example, if the driver requests low blower speed and the passenger requests medium blower speed, the control panel/module will:

- Run the blower at medium speed
- Open the passenger side face vent flap fully
- Nearly close the driver side face flap for low air flow