What to pay attention to
A rising temperature gauge, steam, a sweet coolant smell or visible coolant loss are the main warning signs of overheating.
Why an inspection may still be needed
Overheating can come from a leak, a failed thermostat or cooling fan, or a water-pump fault, and continuing to drive can cause more serious engine damage.
A sensible next step
Switch off and let the engine cool fully before checking anything, never open a hot cooling system, and arrange an inspection rather than repeatedly topping up coolant.