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The heater core does not split the air in any way. There's only an intlet and outlet hoses that run to and from it.
The part you see with the trim removed might not necessarily be the one you're looking for, or the fact that it moves does not necesarily mean that the flap moves as it should. The actuator can either fail completely or the mechanism might stop working correctly.
Are you able to run a flap recalibration process via ISTA?
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