Hey Scotty, I own a 2001 Ford Explorer Sport. I can let it idle all day and night and it won't overheat. But the second i start driving it, the temp gauge skyrockets. I did a radiator flush a few days before and now i replaced the thermostat and it still does it. The coolant backed up from my radiator and almost filled the reservoir. Is something clogged or need replacing? I haven't had these problems before I did the flush.

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could be tons of things, do this video