1994 K1500 heater blower issue

1994 GMC Sierra K1500 4x4 5.7L AC
Electronic AC/heat climate control panel below the radio head unit.... When I select low, the blower blows at low. Same with medium. When I
select high, the blower still blows at medium. New blower motor installed.
What could be the problem?
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Switch is faulty......
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