Buddha, yes, running AC in the AM and PM. I thought Thermostat as when I got it home, popped radiator cap off, gave it some juice, hardly any water flow as if thermostat is partially opened. Enough to keep engine from overheating, yet not enough to keep it running as cool as it should. In addition, the heater in vehicle isn't working when I turn the control knob from Blue to red....I figure no water is getting to heater core. I know the big tires will slow it down somewhat, but it only drags in the hot afternoons so I'm kind of ruling that out, unless they're melting and sticking to the roads. I drive up hillls and down hills both ways to work (LOL). Not sure what an IAT is outside of codes, which was just accomplished at dealer, no codes popped up.