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Well I haven't experienced this problem but I know how the heating system works. Fan blowing (i'm assuming at low, medium & high speeds) and cold air coming out means your heater core is not getting the coolant through it. So likely the heater/blower relay is toast. That's my educated guess. Other possibilities is the heater core is cracked or leaking. But likely you would've either smelled coolant burning or experienced a leak in your cabin.
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