Hell yeah, pretty sure I found it. When I got the 4Runner last year I replaced all heat core lines and the heater valve.
Drive around a bit today and jumped under the truck and heard a drop hit the exhaust and looked at the heater valve and saw the one rubber line isn't seated where it's supposed to be. Felt under it and hit coolant was there. Going to let it cool down and reseat that line and hope for the best.
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