2002 Nissan Quest AC positions 1,2 and 3 doesn't blow out any air,position 4 on 2002 Nissan Quest

When I turn the dial to position 1,2 or 3, air does not come out and only on position 4 do I get a lot of cold air. Does that mean a sensor is out and what do I purchase and details how to fix it is needed? Thanks

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