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Coolant temperature sensor design - GF07.04-P-5026-01F

Design 

Metal housing with 2 separate NTC resistors. 4-pin plug connection, diagonally different resistances.

Contact assignment at connector:

Connection 1 and 4: ME-SFI control module

Connection 2 and 3: Automatic air conditioning control module (N22) or air conditioning control module (N19).

Fig 1: Identifying Coolant Temperature Sensor
G04623874Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Example of coolant temperature Resistance ± 5%
Connection 1 and 4 Connection 2 and 3
20°C 2 500 Ω 6 500 Ω
80°C 325 Ω 650 Ω