What does it mean when the car coolant light comes on?

[DylanLee]

The car coolant light comes on due to reasons such as insufficient coolant, excessively high engine temperature, malfunctioning or failed cooling fan, or damaged thermostat. Here are some relevant additional details: Note: When the coolant temperature warning light comes on, you should stop the car to check, and it is important to stop. Park the vehicle in a safe area but do not turn off the engine; let the engine continue running at idle speed and open the hood to allow heat to dissipate. If you see steam coming from the hood, observe first and do not open it hastily to avoid burns. Check the coolant reservoir: After parking, first check if the coolant level in the auxiliary reservoir is too low. Open the engine hood and see if the coolant level is normal. If the coolant level is below the minimum line, it indicates the coolant is insufficient. If possible, add coolant. If coolant is not available, you can temporarily use mineral water as a substitute, but remember to replace it with new coolant afterward.