Introduction

INTRODUCTION

The E39 IHKA follows the IHKA E38 system and provides features and functions similar to that unit. It incorporates the following features:

- Integrated control panel/module.
- Separate temperature control for the driver and front passenger.
- Air flap control through the use of bussed stepper motors.
- Automatic Recirculation Control (AUC).
- Recirculation air flap control from the MFL.
- "REST" function for residual heat when vehicle is stopped.
- Service station feature that closes the water valves when stopped to prevent hot water circulating into the heater cores.
- A/C compressor clutch activation through a final stage control. Center face vent stratification control through a bowden cable.

COMPONENTS
The major components of the IHKA E39 heater case include:

- Two heater cores with separate inlets and one common outlet.
- Two heater core temperature sensors and one evaporator temperature sensor.
- One evaporator with expansion valve.
- Five stepper motors (six as of 9/97) - four on the M-Bus link and one conventionally controlled.
- One auxiliary water pump.
- One blower motor and relay with final stage output control (final stage located in air flow on passenger side of IHKA housing).