honestly at this point i dont know. i have checked and tested every last thing possible. it has gotten down to the point where the only thing it could be is the lack of cooling volume. no it really doesnt make a lot of sence to me, the factory system should be enough with no more mods then i have. but, everything is new, everything is working as it should, and it does behave when its cooler outside (late evening, early morning) so im down to not having anything else to think it could be. im confused as it gets, this does not make a lot of sence to me. im basically out of ideas and willing to accept that maybe it is just in need of a bigger capacity radiator. its never done it to me before, talked to the previous owner he said the same. but, niether of us have ever had the car in 105 degree weather at 3-5pm with the a/c running. the whole time he had it, the a/c didnt work, and when he got it repaired, it was in january, so he never got to drive it in the summer with a/c. since it didnt have a/c, when the temps were up he took his truck that had a/c. i am very worried i am just masking the issue by getting a larger radiator, but i dont know where else to turn and i need my car to be trustworthy. really chaps my hide that there is a $400 radiator in it, a new water pump, fan clutch, t-stat, hoses, belts, and shroud and its not doing the job. now im looking at another, different, $400 radiator to HOPE it solves the problem. money i just cant spare, but i also cant be without a ride. i am open to try anything at this point, i would much rather proove whats wrong without a doubt, but im out of ideas on how to do that.