I get the classical Engine light. After connecting to OBD II I got code P0128. My thermostat indicate more than 80 degrees. I search the forum but did not find anything how to replace the thermostat on R-350, 2012 Gas engine. Is any directions or anyone can upload some pictures?

 

Post your VIN and will have an answer Wednesday when I return!!

 

R350 has the M272 engine, so it's the same for any model with that engine. The thermostat is located top front and centre on the engine - I would check it with an infrared thermometer to make sure it's actual the thermostat and not the temp sensor that's gone bad.

 

I end up replace the thermostat was real easy job. Did not drain all coolant as per Mercedes benz parts I was told that the antifreeze has no span life you can reuse it. I just drain enough from the radiator plug in buttom and then I add some more. I end up removing oli filter for fitting new thermostat.


Thank you