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Just guessing on this one, but it COULD be that the thermostat won't open completely. At an idle, the coolant circulates enough to cool the engine but when the engine is producing more heat, like when it's running at 60mph, it overheats. Just a guess, but I'd start there. The thermostat is near the front of the engine, on top of the intake manifold. It's under the upper radiator hose. Pull the radiator hose connector housing and replace the thermostat.

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16y ago
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Q: Why does your 350 run hot at 60 mph and cool at an idle?
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