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1999dodge ram has cool heat at idle gets hotter when you drive or rev engine

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Sounds like a bad thermostat, REPLACE IT! And make sure coolant is at proper level. A thermostat should be closed when cold, and wide open at hot engine. if it fails, it will not stay closed at cold engine, or its stuck. When stuck water flows through by pass at thermostat. and does not heatup because thermostat does not hold coolant back until it gets hot. God-Bless!

Posted on Dec 15, 2016

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