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EETC - Equipment & Engine Training Council Cooling Systems and Thermal Management Questions and Answers Flashcards

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Read the first 6 EETC - Equipment & Engine Training Council Cooling Systems and Thermal Management Questions and Answers flashcards as text

  1. An engine overheats only under heavy load but runs normal at idle. Which cooling system component is most likely faulty?

    Answer: Partially clogged radiator or fins reducing capacity under high heat output

    A partially restricted cooling system has enough capacity for light-load heat rejection but is overwhelmed during heavy-load conditions when heat output is greatest.

  2. What is the purpose of the overflow reservoir connected to a radiator cap on liquid-cooled engines?

    Answer: Capture expanding coolant and return it to the radiator when the system cools

    The overflow reservoir captures coolant pushed out by thermal expansion and draws it back in as the system cools, preventing coolant loss and air entry.

  3. How does an oil cooler benefit engines in high-demand commercial equipment applications?

    Answer: It removes heat from engine oil, reducing oil breakdown and extending oil life

    An oil cooler removes excess heat from the lubricating oil, slowing thermal breakdown of the oil and protecting engine bearings under heavy continuous loads.

  4. What type of coolant is recommended for aluminum engine components in modern small engines?

    Answer: OAT or HOAT coolant designed for aluminum protection

    Organic Acid Technology (OAT) or Hybrid OAT (HOAT) coolants contain additives specifically formulated to protect aluminum from corrosion, which is critical for modern aluminum engine components.

  5. What is the effect of air in a liquid-cooled engine's cooling system?

    Answer: Creates hot spots and reduces cooling efficiency by forming air pockets

    Air pockets in the cooling system do not transfer heat as efficiently as liquid coolant, creating localized hot spots that can damage engine components.

  6. During a cooling system pressure test, pressure drops steadily over 10 minutes. What does this indicate?

    Answer: A leak in the cooling system (hose, gasket, or component)

    A steady pressure drop during a static pressure test indicates coolant is escaping the system through a leak that must be located and repaired.

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Sources & references

Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy

  1. eetc.org — Fees, exam format, passing score, retake fee, test delivery, eligibility, renewal, test dates, time limit, score validity · verified Oct 2026
  2. icevonline.com — Test delivery · verified Oct 2026