Component description for a coolant temperature sensor - GF07.04-P-6040AMG

ENGINE 156.980 in MODEL 164, 251 up to Model Year 8

ENGINE 156.982 in MODEL 209

ENGINE 156.983 in MODEL 211, 219

ENGINE 156.984 in MODEL 216, 221 up to Model Year 8

Location

The temperature sensor is located at the front on the right cylinder head.

Fig 1: Identifying Coolant Temperature Sensor

Courtesy of MERCEDES-BENZ USA

Function

The NTC resistor integrated in the temperature sensor alters its electrical resistance in line with the coolant temperature. The ME control unit (N3/10) analyzes voltage signal produced in line with the coolant temperature.

Example:

Coolant temperature	Resistance value	Voltage signal
20°C	3123 Ω	0, 312 V
60°C	632 Ω	0, 063 V
120°C	101 Ω	0, 010 V

NTC means "N egative T emperature Coefficient", which means: The electrical resistance falls as the temperature rises (heat conductor).