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On a recent trip towing 1T trailer up a long incline with ambient temps around 38deg my Redarc gauge with the sensor in the top radiator hose climbed to 120deg - red flashing and alarm sounding - slowed down to allow it cool, temps dropped back to 90deg after a few minutes. Checked coolant level in reservoir and radiator after cooling down at end of trip - all normal. May have to upgrade to Duramax viscous fan clutch.
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