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Test coolant thermostat - AR20.10-P-2455CV

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ENGINE 156, 272 in MODEL 204 

ENGINE 272, 273 in MODEL 207 

ENGINE 156 in MODEL 212 

Shown on engine 272 

Fig 1: Checking Coolant Thermostat - Shown On Engine 272
G09975335Courtesy of MERCEDES-BENZ USA
REMOVINGINSTALLING Remove/install     
1 Remove poly-V belt Engine 156 AR13.20-P-0001CMG
Engine 272, 273 in model 204, 207 AR13.20-P-0001CV
2 Disconnect electrical connector (4) at coolant thermostat (Y110)    
HIGH PRESSURE TEST Measure     
3 Connect multimeter (3) with adapter cable (1) to coolant thermostat (Y110) SPECIAL TOOL Fig 2
4 Measure resistance Engine 156 *BE20.10-P-1003-02D 
Engine 272, 273
IMPORTANT If the measurement value is outside of the given scatter, replace the coolant thermostat:
*BE20.10-P-1003-02C 
Engine 156 AR20.10-P-2460CMG 
Engine 272, 273 in model 204, 207 AR20.10-P-2460CV
5 Install in the reverse order    
CHECK VALUES FOR COOLANT THERMOSTAT

Number Designation ENGINE 156
BE20.10-P-1003-02D Resistor at 20°C Ω 15.2 (±1.5)
CHECK VALUES FOR COOLANT THERMOSTAT

Number Designation ENGINE 272 ENGINE 273
BE20.10-P-1003-02C Resistor at 20°C Ω 15.2 (±1.5) 15.2 (±1.5)
Fig 2: Identifying Adapter Line (220 589 00 99 01)
G09975336Courtesy of MERCEDES-BENZ USA