Do you have proper fencing to your radiator? My car would always run between 175* & 185* in traffic and under little load, but on the freeway it would get to ~200 because the fan (whether it be clutch or electric) loses its efficiency after about 40 mph. I cut out some cardboard just to test if some shrouding would lower my coolant temps and guess what, it did, by about 15* on a stock radiator.
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