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.