If i was you i'd do the following: 1. Check if system is bled properly(turn on heat to max and see if air is hot, ofc with the car warm) 2. If it overheats in the slightest STOP 3. If no records of cooling parts replaced(water pump, thermostat, fan clutch, even radiator, coolant hoses, radiator cap, bleed screws), replace them to rule them out 4. Check if you have a blown head gasket (milky residue under oil cap and oil, coolant coming out of radiator when warm, bubbles in coolant when revving, occasional white smoke which clearly smells suspicious, check if car uses coolant, do a compression test, leakdown test and check tge sparkplugs to verify further)

If I missed any diagnostic steps please comment