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I have the same problem with my 2002 ram.

I'm gonna try a rad flush to see if that helps.

I think the heater core is fine because after 2 on the rpm gauge it warms up perfect, just not when idling.

Maybe someone out there knows more?

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14y ago
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Q: Why does the heater in your 2003 Dodge Ram 1500 only heat up when accelerated?
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