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I had the same issue on my 2014 2500 6.4L stated 2 years after buying the truck new. When I flushed the core I got a ton of sand and other partials. When asking around was told this era of trucks had a poor designed heater core that was sand cast and there were a ton of issues with them. Even...
I own a 2014 Ram 2500 6.4L Hemi took it to the dealership for a heater core issue and was told I also had a misfire code on cylinder 8. Had them replace all coils, spark plugs, wires, and fuel injectors. After $7K worth of work I was told it was fixed. Went to drive it home and did not get off...