Sometimes it's as simple as pressure washing the front of the radiator to avoid overheating when climbing steep grades. If it still does it you may try this. Also if your fan is running all the time you are costing yourself fuel mileage, as it takes horsepower to operate the fan.
Cummins ISX Overheating
Discussion in 'Freightliner Forum' started by zaheerkarim, Nov 13, 2012.
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