Need help with understanding the warning light on my Siecento, looks like a temperature gague. Have already checked radiator and filled but light continues to come on. Is it something to do with the ratio anti-freeze to water?? Unfortunately my manual is in Italian so no help there. Anyone to help a damzel in distress??

red light, looks like a thermometer? chances are it is the overheating light.

nothing to do with antifeeze to water ratio. it is a serious problem though, if the engine is continuously overheating its going to do it some serious harm