🔍 Key Concepts

• Effect of entrained air/oxygen in closed fresh water cooling systems • How air pockets affect heat transfer in engine cooling passages • Relationship between oxygen and corrosion in cooling water systems

💭 Think About

• Think about which consequence would most quickly create a dangerous local overheating condition inside the engine block or cylinder head. • Which option describes something that would stop coolant from actually touching the metal that needs to be cooled? • Is corrosion usually an immediate operational hazard, or more of a long-term maintenance problem compared with sudden loss of cooling?.

✅ Before You Answer

• Identify which choice involves loss of direct coolant contact with hot metal surfaces. • Consider which effect could lead to rapid localized overheating and potential cracking rather than just gradual damage. • Verify that the option you choose clearly connects trapped air/oxygen to a physical blockage or separation in the cooling passages.