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Where is the coolant temperature sensor located on the BMW B48?

1 Answers

LeStephanie

07/29/25 12:11pm

The coolant temperature sensor is installed near the cylinder head thermostat at the interface between the engine and the transmission. Sensor installation: The sensor is installed at the position where the circulating water in the engine returns to the radiator, allowing it to monitor the engine temperature. Vehicles are equipped with a thermostat, so the temperature is consistently maintained at 90 degrees, which is the optimal operating temperature for the engine. Sensor function: Most vehicles have two coolant temperature sensors: a single-wire sensor for the dashboard and a dual-wire sensor that provides data to the ECU to control the fuel injection system and cooling fan. Disconnecting the dual-wire sensor will cause the fan to run. The coolant temperature sensor is a negative temperature coefficient (NTC) thermistor, meaning its resistance decreases as the engine temperature rises and increases as the temperature drops.

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