2002 Ford Focus Overheating

I saw a post on here from 2004 about the same thing but never saw the outcome. I have a friend who's car is overheating until the AC is
on. He's changed the thermostat out but it doesn't seem to have helped. When he pulls up to a stop, the car just dies. Does anyone know what the problem could be? Any ideas would be very appreciated. Thanks!
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