I got a small leak in the radiator the other day. Nothing major not a significant loss of antifreeze. Put anti freeze in. Still overheated. Replaced thermostat. Still overheated. Checked and tested thermostat. Flushed radiator. Still overheated. Fan spins by hand. Belt is good. Replaced water pump 2yrs (about 20,000 miles ago.). Is there anyway to tell if water pump is not working? I’m not sure if it’s metal or plastic. Or which one To go with. Should I just replace radiator and water pump?