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I would check radiator while engine is cold and then makes sure it is full and fill overflow to correct level. Start car and let run for 10 min of so and watch temp guage. Let sit to cool and check for leaks around all hoses and connections, overflow tank, and radiator. FYI - overflow tanks can get small cracks that open when hot and close when cold so check for moisture on sides and bottom. Then I would check temp \\\\thermostat as someone else indicatd,
If he is ever driving it and it gets hot set heater temp to hot and turn on fan to high. Helps disipate heat.
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