Medium and Heavy Trucks
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Hi, It is Dan. I will try to help. Possible causes of your overheating are thermostat, water pump, restrictions of flow in the cooling system of both air or coolant, Fan hub or slipping belts. Have you replaced the thermostat?
What is the complete engine model number from the ID tag on the valve cover or side of the block.... T stat is at/ behind the engine block top radiator hose connection