Where is the BMW right-side ventilation temperature sensor located?
2 Answers
It is installed inside the right brake ventilation duct under the dashboard and connected to the air conditioning ventilation pipe via an air tube. Function: The right front ventilation temperature sensor is a component of the dual-zone automatic climate control system. This sensor directly measures the blower temperature at the central ventilation flap on the front passenger side. A total of 2 ventilation temperature sensors are installed (one on the driver's side ventilation flap and one on the front passenger side ventilation flap). These 2 ventilation temperature sensors are identical parts. The automatic climate control unit (IHKA stands for "Automatic Climate Control") analyzes the signal from the right front ventilation temperature sensor. The IHKA control unit regulates the corresponding flap motor based on this information. Operation: The ventilation temperature sensor is a thermistor or NTC resistor (NTC stands for Negative Temperature Coefficient). The thermistor converts the "temperature" variable into a "resistance" variable that the electrical system can analyze. The conductive material in the thermistor conducts electricity better at higher temperatures than at lower temperatures. In other words, resistance decreases as temperature increases, and the external ambient temperature has a decisive influence on the resistance value.
The right-side ventilation temperature sensor on a BMW is typically located near the air vents on the passenger side or inside the dashboard. Last time I disassembled the car for inspection, I found that in BMW models like the 5 Series or X3, it's mostly positioned on the ventilation duct behind the glove box or directly installed near the footwell of the passenger seat. The sensor resembles a small probe with connected wires, responsible for monitoring the intake air temperature to assist the air conditioning system in automatically adjusting airflow and temperature distribution. If it malfunctions, the AC may blow inconsistent cold or hot air, particularly affecting comfort during winter or summer driving. For accuracy, it's best to consult the vehicle's manual, as installation points may vary slightly between different BMW models. When handling it yourself, be cautious not to damage the wiring, and if necessary, seek a professional workshop to scan the location using a diagnostic tool.
