Which statement about debris clogging radiator is true?

Which statement about debris clogging radiator is true?

• A. It improves airflow
• B. It has no effect
• C. It increases heat transfer
• D. It clogs fins and passages, reducing airflow and heat transfer, causing overheating

Answer: (D)

Debris in the radiator blocks the path of air through the core, and that matter blocks the fins designed to maximize heat transfer. The radiator relies on air flowing over many thin fins to carry heat out of the coolant. When leaves, dirt, or other debris clog those fins and passages, air flow is restricted and the effective surface area for heat exchange is reduced. That lowers the rate at which heat can move from the coolant to the air, so the coolant stays hotter and the engine temperature climbs, leading to overheating. Debris never helps cooling; it makes it worse. If you notice higher temps, check for and remove debris from the radiator and restore clear airflow through the core.

Debris in the radiator blocks the path of air through the core, and that matter blocks the fins designed to maximize heat transfer. The radiator relies on air flowing over many thin fins to carry heat out of the coolant. When leaves, dirt, or other debris clog those fins and passages, air flow is restricted and the effective surface area for heat exchange is reduced. That lowers the rate at which heat can move from the coolant to the air, so the coolant stays hotter and the engine temperature climbs, leading to overheating. Debris never helps cooling; it makes it worse. If you notice higher temps, check for and remove debris from the radiator and restore clear airflow through the core.