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I wouldn't say the "root cause" but definitely an indicator of what the inside of your radiator is going to look like. Sounds like you're in the same situation I was in. Time to pull the radiator and get it cleaned and flush out the block.

This is what I would be looking at. What was the condition of the original coolant? I had a deuce (once upon a time) that would run very hot and the heater never ever got warm. I pulled the heater core and found that it was filled with chunks of rust. This led me to check the radiator and...