Why is a 1999 Plymouth breeze with a new radiator thermostat water pump and serpentine belt still overheating?

You Installed (1) New Radiator (2) New Thermostat (3) New Water Pump (4) New Belt Car Is Still Running Hot/ Did You Install The Thermostat Correctly ? If You Did Very Little Is Left To Cause Problem. Your Car Shouls Have A 2.0 Engine. Is The Fan Running When The Car Heats Up, If Not This Could Be The Problem. Check These Things And Make Sure They Are OK. Hope This Helps. Also Are You Loosing Coolant. If You Are Have A Radiator Shop Pressure Test Your System.