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Lets consider that the coolant level is at it proper level. I would say that the thermostat is stuck closed. Although it could be the water pump, but if it is not rattling or leaking that is probably not your problem. Some times radiator hoes get spongy causing them to clasp when they get hot. Therefore the pump can not push the coolant through the engine. The first thing I would do, is change you thermostat. Good luck!

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Q: What is cause of your 2003 dodge truck to run hot?
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