Correct answer
The pump-drive belt being loose or broken.
A loose or broken belt can prevent the pump circulating coolant correctly. Not every engine has a belt-driven pump. Overheating can also result from low coolant, leaks or faults in other parts such as the thermostat or fan; do not dismiss low level on the assumption that fluid can never be lost or evaporate. If an overheating warning appears, stop safely and follow manufacturer procedures. Do not open a hot cooling system or continue with a leak or unresolved fault.
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The belt being in the condition and at the tension specified by the manufacturer.
The belt driving the pump normally without any fault.
The pump-drive belt being loose or broken.
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