The temperature of the coolant is very important for the correct and efficient operation of the engine. Every engine has a certain ideal working temperature that it needs to reach for its optimal operation.

For proper engine operation, the ideal coolant temperature is between 80°C to 90°C (176 to 194 degrees Fahrenheit), depending on the type and construction of the engine.

The blue engine coolant light informs the driver about the low coolant temperature. In this case, the engine should not be revved to high speeds while this light is on because it is not warmed to its optimal operating temperature.

Once the engine coolant temperature reaches the value specified by the manufacturer, the blue coolant warning light should go out. However, you should know that there are two engine coolant warning lights. Both of these have identical shapes - the only difference is in color.

The engine coolant warning light can have two functions, more precisely, a warning and an informative function. Beware that there may appear two coolant warning lights on your dashboard.

The first one is blue and has only an informative function, while the red one warns of a serious problem.