Q: Q: Overheating issue

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Had a leak near hose fitting. Was in a bind so I used a radiator stop leak product. Truck ran fine for a couple days, then started overheating. I flushed the cooling system. Replaced thermostat. Replaced water pump. Replaced lower radiator hose that was collapsing. It's full on coolant, and still overheats. What do I check now?

My car has 195000 miles.
My car has an automatic transmission.

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