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Fact #1 -Heater cores are usually bypassed because they start leaking.
Fact#2 - Ka's are bitch to bleed the coolant system.
I just rebuilt my Ka-t and also installed an aftermarket radiator on another Ka and yes bleeding air is most likely the problem. Just run the car and keep filling the radiator with coolant with the upper intake bleeder open and squeeze the upper hose to blurp the air out. You can also feel the bottom hose to feel the temperture difference. Close the system add coolant to the resorvoir. Run it till it gets a little warm then let it cool and add more water. Also under the exhaust manifold is another bleeder for the block but I have never had to use it to fully bleed the system. Good luck!
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