Climate Control - Overview: Other BMW 7 series F01/F02

System Air Flow

The air flows through a flap between the fan motor and the climate control housing into the filter housing of the IHKA.

In the filter housing, the air is filtered by two combination filters (with activated charcoal) whether it is fresh air or recirculated air, it then flows on to the evaporator and heater core.

Depending on the IHKA settings and the in side and outside temperature, the air is initially cooled and dried by the evaporator and, if necessary, then re-heated by the heater core to deliver the requested outlet temperature.

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IHKA Blower Fan

The fan draws in the recirculated air from the passenger compartment through an opening in the bulkhead.

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Air Ionizer

The air Ionizer used in the F01/F02 is the latest technical innovation in the area of heating and air conditioning.

The air ionizer is positioned upstream of the evaporator and it is activated as necessary when the vehicle is stationary.

By partial ionization of the air the formation of bacteria on the evaporator surface and the associated odor is prevented.

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The air ionizer is a separate component which fits onto the climate-control unit with bayonet connection and is positioned in the air stream to the evaporator.

It essentially consists of a planar module, a flat ceramic plate which is covered by hard glass with printed electrical conductors located on the front and back of the component.

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Applying a high voltage generated internally in the ionizer partially ionizes the air.

The chemical reaction between the ionized air and the condensed water produces hydrogen peroxide in the evaporator housing, which kills bacteria and germs on the evaporator and thus prevents the formation of unpleasant odors that could enter the vehicle interior.

The IHKA decides when and whether to operate the air ionizer, based on the ambient and operating conditions of the climate control system.

The air ionizer is operated for a period of several minutes by a control signal from the IHKA.

Operation takes place as required only during the overrun period after Terminal 15 is turned OFF and the vehicle is locked.

The maximum power consumption of the unit is 850 mA.

The power supply for operating the air ionizer is through a three-pin connector on the climate control wiring harness.

Communication with the IHKA control panel takes place by means of a control signal via a bidirectional cable connection.

IHKA Components

To optimize the system package, promote comfort and reduce noise level in the passenger compartment, the blower fan for the climate control system has now been placed in the engine compartment.

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Coolant Circuit of the Heating System

The F01/F02 IHKA system is a coolant regulated system. The coolant circuit uses a double solenoid heater control valve to control the temperature of the heater core.

Note. The N63 engine uses a mechanical water pump.

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Refrigerant Circuit

The refrigerant used on the F01/F02 is R134a.

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Main AC Components

The A/C compressor location and refrigerant lines routing in engine compartment.

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A/C Compressor

The system uses a variable displacement AC compressor with a magnetic clutch. Refrigerant pressure and flow are varied as the displacement of the compressor changes in response to the electronic control valve.

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AUC Sensor

The AUC sensor is located next to the fresh air intake. The fresh air is drawn in through the cowl between windshield and hood and passes through a coarse filter in the climate control fan housing before entering the system.

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IHKA Front Control Unit Panel

The control panel and control unit of the climate control system on the F01/F02 is incorporated in the audio systems control panel.

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The driver and front passenger can select separate automatic programs.

In order to be able to cater for the different heating/air conditioning preferences the automatic mode on the F01/F02 climate control offers a choice of 5 different levels of intensity for the automatic program.

Automatic mode is activated by pressing the AUTO button.

The intensity level is selected by repeatedly pressing the "Fan speed" rocker button when Automatic mode is active.

The "ALL" button can be used to synchronize the temperature, AUTO mode intensity or air flow rate and airflow distribution settings for all 4 zones with the settings for the driver.

The Residual feature is similar to the E70 in that it is operated by pressing the HIGH side of the driver's fan speed button.

Some of the possible control scenarios on the control panels of the climate control systems are illustrated below.

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Front Center Air Vent

The front center air vent has a variable airflow focus feature that allows the airflow to be individually varied between spot-focussed and diffused mode settings.

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FKA Rear Control Unit Panel

The 4-zone system has four control points for individually adjusting the climate control settings.

The rear passengers can adjust the temperature separately for the left and right sides.

The automatic program with its 5 intensity settings can also be selected in the rear seats.

As for the front seats, the intensity level in automatic mode for the rear passengers is selected and set by pressing the fan rocker button.

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IHKA Stepper Motors

The IHKA 4 zone has a total of 15 stepper motors for automatic airflow distribution.

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The F01/F02 introduces the interactive vehicle owner's manual.

It provides extensive information on system operation, function, configuration and performance.

The information can be accessed via the main menu.

1. Main menu > (1) Vehicle info > (2) Owner's Manual > (3) Keyword search > (4) Climate Control > (5)

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Extensive information is provided on the subject of air conditioning/climate control.

1. Keyword search > (1) Climate control (2) Automatic climate control > (3) Climate control functions in detail > (4)

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1. Main menu > (1) Settings > (2) Air conditioning > (3) Rear air conditioning > (4)

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Service Information

The following charts show the different systems/user functions and components used in the climate control systems of the F01/F02.

SYSTEM FUNCTION CHART