ABYC Diesel Practice Exam

After an engine has overheated, what is a common symptom indicating coolant issues?

1. Cylinder misfire

2. Excess coolant overflow

3. Oil contamination in the coolant

4. Loss of engine power

The correct answer is: Excess coolant overflow

A common symptom indicating coolant issues after an engine has overheated is excess coolant overflow. When an engine overheats, the coolant expands due to the high temperatures. If the cooling system is not functioning properly or if there is too much coolant in the system, it can overflow from the reservoir or cap. This overflow is a clear sign that there may be a problem with the cooling system's ability to manage temperature effectively, which can lead to further engine damage if not addressed. In this context, excessive coolant overflow serves as an immediate visual indicator that something is amiss. Monitoring the coolant level and the condition of the overflow can help diagnose ongoing problems, such as a failing radiator, a blockage in the cooling system, or improperly sealed system components. Identifying this symptom early on can prevent more severe issues from developing in the engine.