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I just replaced my radiator cap and the smell is gone. I let it run while parked and no more smell and I just drove around for 20 minutes and again, no smell. I am hopefully this fixed my coolant smell in the cabin with the heat on.

I have the same coolant small in my 2019 1500 Limited. This happens with the heater is running. The biggest thing I notice is when I turn ON recirculation, the smell goes away. I saw a simple fix was to replace the radiator cap. I picked on up today and will try it once the truck cools down.