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Two things i would look at that might have you on the edge. First make sure the fan clutch is operating correctly. Second, get to a local car wash that has a pressure washer, pressure wash the AC condenser up front, get all the debris and bugs off, make sure you pressure wash well enough to clean that area between the condenser and radiator. This really simply sounds like a lack of airflow over the radiator. The factory issued a TSB on the inspection of the fan clutch, I have included it.