My coolant levels were fine...
I popped off the coolant cap and it boiled and shot out everywhere (not sure if that was normal because it was so hot?)

I have a brand new thermostat in there and flushed the coolant with new Zerex G-05 (twice) in the last 4 months. No coolant loss.

I have not touched the belt yet, so I'll check tension.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k