Which condition would NOT cause air flow issues through a radiator core?

Excessive mineral deposits in a radiator can affect its efficiency in transferring heat but they do not necessarily obstruct airflow through the radiator core. The primary function of the radiator is to allow air to flow through it, which aids in cooling the coolant. While mineral deposits can lead to reduced heat transfer efficiency by insulating the surfaces where heat exchange occurs, they don't block or restrict the actual airflow that moves through the radiator's passages.

In contrast, a broken shroud, debris buildup, and bent fins directly impede airflow. A broken shroud fails to guide airflow effectively through the radiator, which can create hotspots due to insufficient cooling. Debris accumulation obstructs pathways, reducing the volume of air that can circulate. Bent fins can collapse or restrict the air passages between the tubes, also resulting in reduced airflow. Thus, while mineral deposits impact thermal performance, they are not a structural or physical obstruction to airflow in the same way the other conditions are.