17
2001 model year changes
IHKA IV
The IHKA system is standard equipment on 530i, 540i/it and M5 models. It is available as
an option for the 525i/it. IHKA has been redesigned for the 2001 E39, it is identified as
IHKA IV. The carry over features from the previous version are:
• Integrated control panel/module.
• Separate temperature control for driver and passenger.
• Air distribution control through the use of 5 “smart” stepper motors and one fast acting
hard wired stepper motor.
• Automatic recirculation control (AUC).
• Recirculation control via MFL.
• “Rest” function for residual heat when engine is not running.
• Service station feature that closes the water valves when stopped to prevent hot coolant
flooding the heater core.
• A/C compressor clutch activation via a final stage control.
• Stratification flap control via a bowden cable.
Please refer to the Climate Control course material ST 054 for a complete functional description of
E39 IHKA
