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Truck running hot

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My husband's truck is running hot. He has replaced the t-stat, changed the oil, checked the radiator, put new head gaskets on, made sure it was full of water and antifreeze, and it still runs hot. It only runs hot when he is driving down the road. He can let it idle in the yard and it does fine but once he takes off down the road it starts to run hot. What could it be?