Why is my '99 Pontiac Sunfire overheating?

Mouthof.thesouth

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I've had the thermostat changed and the radiator flushed and new coolant added on a regular basis. There are no leaks and my oil is normal. I'm not sure what else to check. Anytime especially in the summer if im stuck in traffic or sitting still and the car gets no airflow the temp gauge shoots up then the whole car starts vibrating hard from the fan kicking in......been to the mechanic twice about it and still have no answers.....
 
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