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I just bought a car Nissan wingroad 2006, the air conditioner is normal, but there is almost no air volume, the glove box has been removed, but I haven't noticed the position of the filter and blower.
Usually with the glove box removed you will have access to the three or so screws holding the blower motor in which you could remove and check the operation and for any blockages. There is also a fairly Nissan wide issue of the blower fan speed controller failing and some fan speeds not being selectable. Usually it is the low speed affected and it is all or nothing.