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Just something to consider... though rad fans are great at pulling (or pushing) air through the rad while idling at a stoplight or slow cruising, they often can be a hindrance to airflow through the rad at highway speeds. In other words if your fan is running while moving at highway speeds, it may well be inhibiting airflow, not encouraging it; even the high CFM after-market ones. Try turning your fan off while on the highway and see if it makes a difference.
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