I possess a 2013 C180 (W204) (1600 petrol) BlueEfficiency estate featuring the AMG sport package.
The temperature indicator periodically reaches the red zone, seemingly when the engine is under strain, albeit not consistently—typically during prolonged inclines or at high speeds above 70 mph.
The "stop engine" alert has occasionally activated.
However, I do not believe the engine is genuinely overheated.
The coolant is transparent, and there are no indications of head gasket issues.
The gauge fluctuates, but as I decelerate, it returns to normal and may operate for hours without issue, remaining within the standard range, provided I do not exert excessive pressure.
The Hi Tech Performance Garage conducted a comprehensive inspection and identified no concerns; nevertheless, I question if they performed an extensive road test, subjected it to maximum load, or utilised their rolling road.
Do you have any experience with this or any recommendations?