Right away
- Switch off the AC and pull over safely.
- Turn off the engine.
- Never open the radiator cap while hot: boiling coolant can burn you.
- Wait at least 30 minutes before checking coolant.
Common causes
- Low coolant or a leaking hose
- Radiator fan not working
- Blocked radiator
- Faulty thermostat or water pump
Don't keep driving
Driving an overheated engine can damage the head gasket and cost far more. Call a checked mechanic or tap Emergency to see the nearest one.