EETC EETC - Equipment & Engine Training Council Cooling Systems and Thermal Management Questions and Answers 2

Question 1

What is the correct procedure when replacing a liquid-cooled engine thermostat?

Accepted Answer

Install with the temperature-sensing end facing the engine block

Answer

Install it in any orientation since thermostats are symmetric

Answer

Install with the temperature-sensing end facing the radiator

Answer

Thermostats never need replacement

Question 2

On a liquid-cooled small engine, what does a radiator pressure cap primarily do?

Accepted Answer

Keeps the system sealed and raises the boiling point of coolant

Answer

Prevents coolant from circulating

Answer

Acts as a one-way valve for coolant expansion only

Answer

Measures coolant pressure

Question 3

What is the recommended method for cleaning debris from air-cooled engine fins during maintenance?

Accepted Answer

Compressed air blown in the direction of normal airflow

Answer

High-pressure water wash

Answer

Solvent soak

Answer

Wire brush scrubbing

Question 4

Which condition causes a liquid-cooled engine to run consistently cool and never reach operating temperature?

Accepted Answer

Thermostat stuck in the open position

Answer

Thermostat stuck in the closed position

Answer

Clogged radiator

Answer

Low oil level

Question 5

What ratio of antifreeze to water is typically recommended for year-round protection in most US climates?

Accepted Answer

50% antifreeze / 50% water

Answer

25% antifreeze / 75% water

Answer

75% antifreeze / 25% water

Answer

100% antifreeze

Question 6

What causes a cooling fan shroud to be critical on an air-cooled engine?

Accepted Answer

It directs airflow over all cylinder fins evenly to prevent hot spots

Answer

It reduces engine noise only

Answer

It supports the fuel tank

Answer

It seals the crankcase from external debris