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First off check your fluid level, then look in the radiator with the cap off and the engine running and you should see the fluid moving, if not then suspect the water pump but the most likely cause is a malfunctioning thermostat. Your description leads me to this as the best guess if the radiator is not extremely hot or you suspect that the guage is saying it is hot when it seems pretty normal then the temperature sending unit may be the problem. you said always hot so I assume it means all the time like the guage never says cold.
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