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

ENGINE 112.910 /911 /912 /913 /914 /916 /917 /920 /921 /922 /923 /940 /941 /942 /943 /944 /946 /947 /949 /953 /954 /955 /970 /972 /973 /975 

ENGINE 113.940 /941 /942 /943 /948 /960 /961 /963 /965 /966 /967 /968 /969 

ENGINE 137.970 

ENGINE 166.940 /960 /990 /995 

ENGINE 166.960 with CODE (922) Power-reduced 

Fig 1: Identifying Coolant Temperature Sensor - Design
G04605877Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  Coolant temperature sensor position Engine 112, 113 GF07.04-P-5026-02A 
Engine 137 GF07.04-P-5026-02L
Engine 166 GF07.04-P-5026-02GC
  Coolant temperature sensor task Detects the coolant temperature and sends a signal to the engine control unit  
  Coolant temperature sensor, design Plastic housing with NTC resistor. 2-pin, slanted plug connection.
Inserted into hole and sealed with O-ring. Mounting over a spring clasp or holder
 
  Coolant temperature sensor function The NTC resistor alters its electrical resistance in line with the coolant temperature. It decreases as the temperature increases.  
Example:
Coolant temperature
Resistor
20 °C 3100 Ω ±5%
80 °C 315 Ω ±5%