WIS 20.10 Coolant Pump, Coolant Thermostat

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Description - Coolant Thermostat

TBA

Issues - Coolant Thermostat

  • New thermostats only seem to last about 5 years and then start malfunctioning.
  • Thermostats commonly gets fatigued with time and no longer maintain the engine at the correct operating temperature.
  • A fatigued thermostat also takes much longer for the vehicle to warm up from cold resulting in unnecessary engine wear and higher fuel consumption.
  • Thermostats often remain permanently stuck open.
  • Some thermostats remain stuck closed, evidenced by an overheating engine.

Part Number - Coolant Thermostat

  • Reference: WIS WDB220175 (S500L) and engine M113 960
  • A 112 203 02 75 (Replaces A 112 200 00 15)

Specification - Coolant Thermostat

The engine coolant thermostat specified opening temperature is 87°C.

Comparison of Old and New Thermostats - Coolant Thermostat

W220_Comparison_of_Old_and_New_Thermostats.JPG

DIY Procedures - Coolant Thermostat

DIY Mesurements - Coolant Thermostat

Version 01 posted 2012-04-27: http://www.benzworld.org/forums/w220-s-class/1649584-s500-new-thermostat-compared-original.html

DIY Replace - Coolant Thermostat

http://www.benzworld.org/forums/w220-s-class/2296553-v12tt-water-pump-diy.html

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