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Also look carefully for anything that is causing the recirc flap to not close completely, or for any sealing issues like rotten foam. Also makesure the heater control valve is shutting the hot coolant off from the heater core, might even consider clamping off either the supply or return heater hose to see if that helps (valve not shutting off coolant completely). You can do that in the engine compartment, or just connect the supply and return lines and bypass the core altogether, in a reversible way.
It may not be whats wrong or fix whats wrong, but you won't get the heater core hot and get hot air when you don't want it.
regards
mech
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