If the temperature warning light goes on what should you do?

If the temperature warning light activates, immediately pull over to a safe location and turn off the engine to prevent overheating. Allow the engine to cool down for at least 15-30 minutes before checking the coolant level. If low, add coolant or water as needed, but only when the engine is cool. If the warning light remains on after addressing coolant levels, consult a professional mechanic to diagnose the issue.