Air control unit only blows air on #4 on 2007 Chevrolet Colorado

Numbers 1,2, and 3 are out. Only #4 blows air. How can i repair this?

by in Hackettstown, NJ on October 07, 2010
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1 answer 1 comment
ANSWER by , October 07, 2010
I WOULD BE SUSPECT OF THE BLOWER MOTOR RESISTOR . ITS NEXT TO THE BLOWER MOTOR
COMMENT by , January 30, 2011
it is the P.O.S. wiring harness.