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)INDEPENDENT HEATING/VENTILATION
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)
Independent Heating/Ventilation
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)SECTION Independent Heating/Ventilation
Operation
If an independent heating system is installed, the relay box, which switches the independent heating or independent ventilation program in the IHKA control unit, can be activated via the on-board computer. At the selected time, the on-board computer switches on the independent heating at an outside temperature < 16°C (61°F) and the independent ventilation at an outside temperature > 16°C (61°F). For test purposes, by switching the on-board computer in inverse mode, the function at < 16°C (61°F) outside temperature can be interchanged with the function at > 16°C (61°F) outside temperature.
Flap/Blower Settings
If an independent heating system is installed, the relay box, which switches the independent heating or independent ventilation program in the IHKA control unit, can be activated via the on-board computer. At the selected time, the on-board computer switches on the independent heating at an outside temperature < 16°C (61°F) and the independent ventilation at an outside temperature > 16°C (61°F). For test purposes, by switching the on-board computer in inverse mode, the function at < 16°C (61°F) outside temperature can be interchanged with the function at > 16°C (61°F) outside temperature.
Flap/Blower Settings:
Flap/Blower Settings
RENDER: 1.0x
NO RELATED
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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.