Q: Van overheats at idle, temperature jumps and then drops

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The van has gone only 65,000 miles. It is well maintained. But, it has been overheating lately. This occurs usually when the weather is hot. Also, it overheats while idling. For instance, I would drive in the city, in the stop-and-go traffic, and when I'm stopped the temperature would jump significantly and then drop down. I installed a new radiator. There are no leaks as far as I checked. What is causing this?

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