I have a 99 3.8L V-6 camaro that is overheating, I have repalced the waterpump, thermostat, I have a radiator thats only a year old . I am scratching my head on why this is happening , also my heater would never kick on this winter so I'm thinking my heater core could be clogged or hoses, any suggestions out there.

No heat and an overheating engine.. Sounds like air in the cooling system. A stopped up heater core wouldn't cause an overheat.