You have a air lock in the heater core, you need to burp the cooling system, it can take a while in some cases you have jack the vehicle up to get all the air out, I think the heater core in this vehicle sits higher than the engine. You may want to put a flushing tee in the heater core return hose to help get the core bled. I hope this helps
Change the water pump on 2013 Ram 1500 now the heater is not getting warm temperature on the thermostat Rises to 195 but still not getting warm
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