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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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18y ago

What else can I help you with?