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2002 sonata overheats. Just bought the car if I turn on a/c it will lose power. No leaks and has no thermostat. Any ideas what is causing it to overheat
 

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Most modern thermostats are a dual valve unit meaning they also close off the bypass passage when they open. Leave them out and your engine will overheat. Not saying your car has one but food for thought.
 

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Can you find the engine coolant temperature sensor?
I am suspecting the sensor is not working

You will need to test to see if it turns on the fans or not
 
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