if water was used as coolant, check all hose pipes, heater pipes, & water body inlet, corroded water lines also cause coolant leakage to overheat engine. to check seepage in lines, add 1 blue ink bottle into radiator let engine idle for a while and check leakage. fix leakages replace damaged parts . ensure that cooling fans are rigged to work on automatic. always use coolant prepared in bottled water 60% water 40% coolant
a compression test will help ascertain the damage caused by overheating - send pm to argtr65 for further help