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 MANUALSBMW2001330CI CONVERTIBLE (E46) L6-3.0L (M54)REPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGDESCRIPTION AND OPERATIONTEMPERATURE CONTROLINTERIOR TEMPERATURE SENSOR (IHKA INTEGRATED AUTOMATIC HEATING/AIR CONDITIONING)
2001 BMW 330Ci Convertible (E46) L6-3.0L (M54)
Interior Temperature Sensor (IHKA Integrated Automatic Heating/Air Conditioning)
2001 BMW 330Ci Convertible (E46) L6-3.0L (M54)SECTION Interior Temperature Sensor (IHKA Integrated Automatic Heating/Air Conditioning)
Temperature Control
The required temperature in the passenger compartment (setpoint temperature ) is set by means of a rocker switch on the operating panel and shown in the display. The interior, heat exchanger, evaporator, outside and coolant temperatures are evaluated for the purpose of temperature control together with the driving speed and engine speed signals.
Heater operation is based on the reheat principle. The air is cooled down by the evaporator and then heated up again to the required temperature by the heat exchanger. The temperature of the heat exchanger is controlled by a clocked water valve. In this way, the control module calculates the valve opening times dependent on the above-specified input variables. The valve opening times are 0 ms at max. COLD and 3600 ms at max. WARM.
A mechanical mixing air adjuster makes it possible to influence the outlet temperature at the ventilation nozzles. The temperature can be changed within the range from evaporator temperature to heat exchanger temperature.
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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.