Which component failure most commonly leads to engine overheating due to lack of coolant circulation?

Which component failure most commonly leads to engine overheating due to lack of coolant circulation?

• A. A clogged radiator.
• B. Failed water pump.
• C. A blown fuse in the HVAC system.
• D. A faulty oxygen sensor.

Answer: (B)

Coolant must be circulated through the engine and radiator to remove heat. The water pump is the device that drives that flow. If the water pump fails, coolant circulation essentially stops, so heat isn’t carried away and the engine quickly overheats. A clogged radiator blocks heat transfer, which worsens overheating but doesn’t necessarily stop circulation. A blown fuse in the HVAC system or a faulty oxygen sensor don’t directly affect the engine’s cooling loop.

Coolant must be circulated through the engine and radiator to remove heat. The water pump is the device that drives that flow. If the water pump fails, coolant circulation essentially stops, so heat isn’t carried away and the engine quickly overheats. A clogged radiator blocks heat transfer, which worsens overheating but doesn’t necessarily stop circulation. A blown fuse in the HVAC system or a faulty oxygen sensor don’t directly affect the engine’s cooling loop.