Update.
Found my coolant reservoir cap had a broken seal. Replaced with Mopar cap from dealership and the noise behind my dash went away. Obviously wasn't enough pressure in the system to move the air trapped in the core.
I've been noticing an interesting noise coming from my dash when accelerating. It only appears 1500 rpm or higher. I wouldn't say it sounds like a vacuum line. It sounds more like hot oil in a pan having a few drops of water sizzle into it. Stops the second I let off the gas. Anyways this led me...
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