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Flushed (back flush) the heater core twice and still no heat. I fear it's the heater core. But I did notice that the air flow changes from vents to floor to no where depending on acceleration and such. Maybe a vacuum problem then?
Correct. When I am accelerating, the air switches from one vent location to another. If I keep accelerating, then at some point it sounds like all the air is blowing inside the dash but doesn't come put any vent.