The word "core" is short for "cash on return." When you purchase a part which is rebuildable , you can return your old part and receive a core charge. Generally a core charge is collected for engines, crankshafts , alternators , radiators , and brake shoes . If the part is beyond repair, there may be no core charge.
CORE CHARGE
Meaning of CORE CHARGE in English
English dictionary of automotive terms. Английский словарь автомобильных терминов. 2012