You say the heater core cools down quikely when the blower is turned on, sounds like the core is restricting the flow of coolant. flushing the core doesn't always fix the problem of having been plugged, forcing water through a couple of good passages can fool you to think that it flows good throughout, plus you already have it torn apart. unless you have a restriction somewhere else in the heater hoses, I'd say it is the core.

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