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Coolant temperature sensor function - GF07.04-P-5026-04M

Fig 1: Identifying Coolant Temperature Sensor Connection Pins
G07618528Courtesy of MERCEDES-BENZ USA

The NTC resistor integrated in the coolant temperature sensor (B11/4) alters its electrical resistance in line with the coolant temperature.

NTC is the abbreviation for " egative emperature oefficient", which means electrical resistance falls as the temperature increases (hot conductor).

Example:  
Coolant temperature Resistor
20°C 3090Ω±5%
80 °C 320Ω5%