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One possible cause could be due to a faulty water pump impeller which can manage to pump the water at idle but not at higher RPM. this can happen because the impeller is made of a hard nylon and is a push fit onto the water pump shaft. Also check your thermostat is in place(dont know cars history) because if it was removed
it could have the same result.
Good luck!

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Q: Why is 2001 pt cruiser overheating when driving but not idling?
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