Originally posted by FlyinEsi
Could my FMIC be filled with crap and not letting air get to the radiator??

Highly unlikely. I would personally be draining whatever is in your cooling system and doublechecking there is no oil in there. Same goes for your crank case and no coolant. After that I would be putting in a cooler thermostat (if applicable) and wiring the fans so that both come one instead of just the one. A clogged or damaged radiator can cause your symptoms if prolonged. I regular coolant flush isn't going to get out that shit in the radiator if that's the case. You're going to have to actually take it out and inspect it yourself, replace and/or upgrade if need be. Hot and dry weather require special attention.