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No one mentioned the heater control valve. If it doesn't get 12V, it sends hot water to the heater core. If there is a bad diaphram in the valve, hot water also goes to the heater core. Blend this with the cold air from the evaporator and it seems like the AC is not working.
I'd agree there is a good chance the evaporator core is plugged with the same junk that's in the vents.
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