The main reasons for overheating are coolant level is low, leak in the engine cooling system, thermostat is bad, water pump is failing, radiator cooling fan is not working, blown head gasket but as you said you replaced all that. so now you must have to take your car to an expert. you should avoid the existing shop and visit to a good auto repair shop. I suggest you a best auto repair shop i.e. Transmission Experts, they are really helpful. Transmission Experts also offers a wide range of auto repair services including Transmission rebuilding, Radiators, Drive shaft repair, Breaks, shocks, alignment, suspension etc.