Technician A says that a heater core leak can be the result of the coolant wearing a hole through the core. Technician B says that a core leak can be caused by chemical action eating a hole through the core. Who is correct?

Both Technician A and B re correct

Explanation:

Heater core leak is a minor damage that occurs as a result of a small leak in the heater core. It can be remedied by simply sealing the leak and leaving your heater core in place. heater core leak can be the result of the coolant wearing a hole through the core.

Thus core leak can be caused by chemical action eating a hole through the core.