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)TEMPERATURE CONTROL WHEEL
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)
Temperature Control Wheel
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)SECTION Temperature Control Wheel
Operation
The nominal value for the inside temperature is set with the temperature control wheels. The temperature values printed on the selector wheels of the operating unit do not correspond to the values which are used by the control unit and which can be read out via the status list, but rather to a comfort temperature. When setting the temperature, the control wheel on the driver's side has priority near the end positions over the control wheel on the passenger's side. In addition, a comfort allowance is implemented within the outside temperature range from 40°C to 25°C (104°F to 77°F). The comfort allowance ranges from 13°C (56°F) at - 40°C (-40°F) to 0°C (32°F) at 25°C (77°F).
When the temperature control wheel on the driver's side is set to maximum heating, the positive supply to the water valves is interrupted by way of a mechanically coupled switch. In this position, the control unit interrupts the diagnostic procedure for the water valves which are open when no power is applied.
The nominal value for the inside temperature is set with the temperature control wheels. The temperature values printed on the selector wheels of the operating unit do not correspond to the values which are used by the control unit and which can be read out via the status list, but rather to a comfort temperature. When setting the temperature, the control wheel on the driver's side has priority near the end positions over the control wheel on the passenger's side. In addition, a comfort allowance is implemented within the outside temperature range from 40°C to 25°C (104°F to 77°F). The comfort allowance ranges from 13°C (56°F) at - 40°C (-40°F) to 0°C (32°F) at 25°C (77°F).
When the temperature control wheel on the driver's side is set to maximum heating, the positive supply to the water valves is interrupted by way of a mechanically coupled switch. In this position, the control unit interrupts the diagnostic procedure for the water valves which are open when no power is applied.
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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.