The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and __________.
• Thermal expansion of coolant as engine temperature increases • Purpose of a closed cooling system expansion tank • What happens to system pressure if expanding coolant has no extra space
• When the engine warms up, what happens to the volume of coolant in a closed system? • If there were no expansion tank, where would that extra volume or pressure go? • Which choice describes a function that is uniquely necessary in a closed cooling system, rather than just a helpful side effect?
• Verify which option directly relates to change in coolant volume with temperature • Eliminate any options that do not clearly connect to system pressure and volume changes • Focus on the answer that explains why extra space is needed in a sealed/closed cooling system
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