Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBMW1993740IL (E32/2) V8-3982CC 4.0L DOHC (M60)REPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGDESCRIPTION AND OPERATIONCLIMATE CONTROL SYSTEMS, SYSTEM SPECIFICIHKA (AUTOMATIC CLIMATE CONTROL SYSTEM)AIR FLOW CONTROL WHEEL
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)
Air Flow Control Wheel
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)SECTION Air Flow Control Wheel
Operation
The IHKA control unit takes up operation when the ignition is switched on. The IHKA can be switched on and the nominal value for the air flow set with the air flow control wheel. An increase in the set air flow rate by the wind during driving is largely compensated by the fresh air flap closing dependent on the vehicle speed. The blower is switched off via terminal 50 when starting the vehicle.
A switch is coupled with the air flow control wheel to ensure the blower can take up emergency operation in the case of a defect in the air flow control wheel, failure of the control unit or a defect in the output stage electronics. In the maximum position of the air flow control wheel, this switch switches positive to a relay integrated in the output stage, thus bypassing the output stage electronics. The blower then runs at full power. This switch is not included in the diagnostic procedure for the control unit. It is protected in the case of a short-circuit by a resistor (PTC) connected in series to the switch.
The IHKA control unit takes up operation when the ignition is switched on. The IHKA can be switched on and the nominal value for the air flow set with the air flow control wheel. An increase in the set air flow rate by the wind during driving is largely compensated by the fresh air flap closing dependent on the vehicle speed. The blower is switched off via terminal 50 when starting the vehicle.
A switch is coupled with the air flow control wheel to ensure the blower can take up emergency operation in the case of a defect in the air flow control wheel, failure of the control unit or a defect in the output stage electronics. In the maximum position of the air flow control wheel, this switch switches positive to a relay integrated in the output stage, thus bypassing the output stage electronics. The blower then runs at full power. This switch is not included in the diagnostic procedure for the control unit. It is protected in the case of a short-circuit by a resistor (PTC) connected in series to the switch.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.