my 1992 camry resently stated over heating on 1992 Toyota Camry

i just resently had a tune up done then i had been adding water to the car i bought coolent and i had my boyfriend add the coolent he drain the host to let the water out.. so 2 dayss later it started over heating i change the thermostat i had a new water pump put in last year with a new time belt i do have a new radiator i wana try havent change it yet some ppl sed it can be the head gaskets but thers no water in the oil and car runs fine please help

2 answers
Radiator fans working?
start lookin at your air flow. could be clogged cat.converters. the new radiator couldn't hurt either.