my blower only works on high which is #4 for the heat and air on 2002 Nissan Quest

this just started blower works only on high #4

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2 answers
There is a blower fan resistor pack that has failed easy to replace. $ wires going to it usually under dash near glove box. Autozone have some popular workshop manuals for free on line once you register (for free) on their website http://bit.ly/autozone_repair_info They may have a picture/location of the part.
with the nissans its usually the heating element located in the blower under the dash