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

ENGINE 604.910 in MODEL 202.121 as of 1.8.96, 202.182 

ENGINE 604.912 in MODEL 210.004 as of 1.6.96 

ENGINE 604.915 in MODEL 202.122 /180 

ENGINE 604.917 in MODEL 210.003 

ENGINE 605.960 in MODEL 202.128 as of 1.4.96, 202.188 

ENGINE 605.912 in MODEL 210.010 as of 1.6.96, 210.210 /610 

ENGINE 606.912 in MODEL 210.020 as of 1.6.96 with CODE (491) U.S. version 

ENGINE 602.982 in MODEL 210.017 /217 /617 

ENGINE 606.961 in MODEL 140.135 

ENGINE 606.962 in MODEL 210.025 /225 

ENGINE 605.962 in MODEL 210.015 /215 

Engine 602.982 

In the cylinder head between cylinders 1 and 2. 

Fig 1: Identifying Coolant Temperature Sensor Location In Cylinder Head Between Cylinders 1 And 2
G04623880Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  Coolant temperature sensor position Engine 604, 605, 606 GF07.04-P-5026-02H 
  Coolant temperature sensor task To measure the coolant temperature and supply the corresponding signal to the engine control module  
  Coolant temperature sensor design   GF07.04-P-5026-01C 
  Coolant temperature sensor function The NTC resistor integrated in the coolant temperature sensor (B11) alters its electrical resistance in line with the coolant temperature.
NTC means negative temperature coefficient, in other words electrical resistance decreases as temperature increases
 
    Example:  
    Coolant temperature Resistance  
    20°C 3100 Ω  
    80°C 315 Ω