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Coolant temperature sensor, location/task/design/function - GF07.04-P-5026M

ENGINES 275.950 in MODEL 215, 220 

ENGINES 275.951 in MODEL 230 up to Model Year 08 /Modification Year 07 

ENGINES 275.953 in MODEL 216, 221 up to Model Year 08 /modification year 07 

ENGINES 275.954 in MODEL 230 up to Model Year 08 /Modification Year 07 

ENGINES 275.980 in MODEL 215, 220 

ENGINES 275.981 in MODEL 230 up to Model Year 08 /Modification Year 07 

ENGINES 275.982 in MODEL 216, 221 up to Model Year 08 /modification year 07 

ENGINES 285.950 in MODEL 240 

ENGINES 285.980 in MODEL 240 

Fig 1: Identifying Coolant Temperature Sensor Connection Pins
G07537580Courtesy of MERCEDES-BENZ USA
Coolant temperature sensor position   GF07.04-P-5026-02M 
Coolant temperature sensor task Detects the coolant temperature and sends a signal to the engine control unit  
Coolant temperature sensor, design Plastic housing with integrated NTC resistor and a 2-pin, slanted plug connection. It is inserted into a bore hole and sealed with an O-ring. Fixing via a bracket.  
Coolant temperature sensor function   GF07.04-P-5026-04M