What it can mean
Continuing to drive an overheating vehicle can cause severe damage and hot coolant can cause burns.
What to do next
- Turn off air conditioning and stop safely.
- Switch off the engine if the warning persists or steam is visible.
- Never open a hot cooling system; arrange inspection after it cools.
Possible causes to test
- Coolant loss
- Cooling fan fault
- Thermostat or water-pump problem
- Restricted coolant flow