QUICK, TEMPORARY, EFFECTIVE FIX:
I have this issue, and can't afford to get it fixed properly right now. The HVAC tech pulled me aside and told me that if I just need to get through the Summer and save up to get it done professionally, I can pinch off one of the heater hoses going into the firewall to prevent hot coolant getting to the heater core.
I used a fuel line clamp on one of the heater hoses and it immediately cooled down and after a few minutes, it was like there wasn't even a problem.
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