🔍 Key Concepts

• Heat transfer in closed freshwater cooling systems and what happens when flow is restricted or coolant volume is low • The difference between causes of high temperature (overheating) and conditions that are mostly corrosion/erosion related • Function of the expansion/header tank in maintaining system pressure and coolant level

💭 Think About

• For each choice, ask: Does this condition directly reduce cooling capacity (flow, heat exchange surface, or coolant volume), or is it mainly a chemical/corrosion issue? • Think about how a low coolant level or the presence of air affects circulation and heat transfer in a closed cooling system. • Consider what a damaged or eroded baffle in a cooler actually changes in the water flow path and cooling efficiency.

✅ Before You Answer

• Identify which option would most directly cause reduced effective coolant volume or loss of proper circulation, leading to higher temperatures. • Separate options that mainly indicate water treatment/chemical protection from those that affect mechanical cooling performance. • Ask which condition would show up first as an immediate temperature rise on gauges rather than as a long-term maintenance problem.