3 Series E92 325xi (N53) COUPE
The IHR/IHKR has 3 flap motors.
•
IHKA until 09/2007
The IHKA has 6 flap motors (due to the left/right separation for the driver's side and the front-passenger
side and because there are no central kinematics).
•
IHKA from 09/2007
7 flap motors are installed in the IHKA (the front stratification flap motor is new).
> E90, E91, E92, E93
•
IHKR
The IHKR has 3 flap motors.
•
IHKA
The IHKA has 8 flap motors (due to the left/right separation for the driver's side and the front-passenger
side, the additional stratifying flap motors and because there are no central kinematics).
> E70
•
IHKA Basic
The IHKA Basic has 6 flap motors.
•
IHKA High
The IHKA High has 10 flap motors (due to the left/right separation for the driver's side and the front-
passenger side and the ventilation flap motors for the rear compartment).
•
IHKA High with automatic rear air conditioning
With the IHKA High with automatic rear air conditioning (FKA), there are 13 flap motors (due to the
separate settings for the left and right sides in the front and rear).
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Central kinematics (IHR, IHKR only)
The central kinematics are used to mechanically adjust the air distribution flaps. The central kinematics are
driven by the air distribution flap motor. The air distribution flap motor is actuated by the IHR or IHKR control unit.
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Blower with blower output stage
The blower generates the necessary airflow. The blower is installed after the fresh-air/air-recirculation flap in the
heating/air-conditioning system (pressure blower configuration).
The blower end stage is fitted directly on to the blower motor housing. The blower end stage is actuated with a
pulse-width modulated signal (PWM signal) by the IHR/IHKR/IHKA control unit. The blower output stage is not
capable of diagnosis.
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A/C compressor with electric control valve (IHKR, IHKA only)
The A/C compressor compresses the refrigerant drawn in by the evaporator. The refrigerant is pressed to the
condenser. The A/C compressor used is clutch-free. That means that the A/C compressor always runs with the
engine. A swash plate in the A/C compressor allows the output to be smoothly regulated. The electric control
valve on the A/C compressor influences the balance of forces on the swash plate and thus the adjustment of the
displacement. To reduce load, only the cooling output actually needed is generated.
The junction box electronics unit controls the control valve with a clocked voltage. The IHKR or IHKA controls
specify the actuation.
Note: A/C compressor with magnetic coupling
Measure for reducing CO2 emissions: Depending on the engine version and national version, an A/C
compressor with magnetic coupling supersedes the A/C compressor previously installed with electric control
valve.
SBT Integrated heating control and air-conditioning system E70, E81, E82, E87, E90,
BMW AG - TIS
30.01.2013 05:32
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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