Q: Q: Engine overheat

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At McDonald's drive thru with a/c on, noticed it was blowing hot air. Looked at temp gauge and it was overheating. Pulled over shut truck off to cool down. Shut a/c off. Started truck with no a/c and it didn't overheat. Drove home and parked, turned a/c on and both fans operated and it didn't overheat again. I can not duplicate the overheat.

My car has 80000 miles.
My car has an automatic transmission.

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