Overheating issues

Is your hood to radiator support seal in place? How about your lower cowl to radiator support seal? Without these seals in place, air can and will just flow over and under the radiator instead of getting trapped in front of it and being vacuumed through it. Kind of like drinking through a straw with a hole in it. Could also be a timing issue, or a partially clogged radiator. What thermostat are you running?