Help with blower fan

My blower fan on my 90 wagon only works when i set it to the 3rd or 4th level.
the 1st and 2nd doesn't work. Do I need to replace my blower fan or maybe my climate control unit? Everything else like heat and the vents work fine.
the 1st and 2nd doesn't work. Do I need to replace my blower fan or maybe my climate control unit? Everything else like heat and the vents work fine.
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