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Hi its ounds like the fan has failed, the fan blows the heat into the vents without it, it will just remain in the heater core. other possibility and very common also is the cabin heater regulator they ofetn go, located in the middle of the car looking into the engine compartment has 2 pipes one in one out, feel the pipes see which is hot etc and get back to me.
It sounds like the heater motor may not be operating. When you switch the heater fan on can you hear the motor running? If not then it may have blown the heater fan fuse, check the fuse's and then try it again. If the fuse is ok then it could be a faulty switch or fan motor.