Why is my car overheating? - 2

Back in June, my 2002 Honda Civic began to overheat every day. Repair shop put a new thermostat in and it ran perfectly. Problem solved! Or so I thought. It ran fine for about 6-8 weeks. Then it started overheating again out of nowhere. Another new thermostat was put in, thinking the old one may have been defective. My car ran fine for another 6 weeks or so and then it started to overheat again out of the blue. What the heck? Repair shop is puzzled.

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