Originally posted by Remy
Do you even need antifreeze when temps stay in the 100's ? Are you sure you had enuff coolant in the system from the get go ? When you first put it in , did you turn the heat on high to let the thermostat open so the coolant could go threw the entire car ? Did you pressure test the car ? WWW.CNNMOTORSPORTS.COM

I'm prety sure you should leave some coolant in the mix because I think it lowers the boiling point. And usually, overheating problems occur when the car is at an idle when there is no air flowing through the radiator. I'm pretty sure you changed the thermostat, yes? I don't feel like going back and re-reading everything...