Man, I know this is a year or two ago but I am having the exact same issues with my 2016 Ram Truck 5.7 Hemi.
Did you ever figure it out!?
Changed the water pump (twice), changed the thermostats, ran without a thermostat, thought it was a blown head gasket but that test came back negative...
Bought a 2016 Ram with Hemi 5.7 at auction 2 weeks ago sight unseen. Overheated Immediately, managed to limp it home.
Appeared to have new water pump installed already.
Investigated.
Appears to be no coolant circulation.
1. Removed t-stat, filled system up with coolant until it came out of...
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