Coolant Temperature Sensor, Function

Coolant Temperature Sensor, Function




Illustration shows 2-pin plug connection
B11 Coolant temperature sensor




Illustration shows 4-pin plug connection
B11/4 Coolant temperature sensor (further designations e.g. B11/3)

The NTC resistor alters its electrical resistance in line with the coolant temperature.NTC means negative temperature coefficient, in other words the electrical resistance becomes less as the temperature rises:

Coolant temperature resistance
20 °C 3100 ohms ± 5%
80 °C 315 ohms ± 5%