Heating problem - heat on passenger side - not on drivers side on 2004 Chevrolet Monte Carlo

Cold air blowing out on drivers side - heat blowing out on passenger side - what do I do to correct. this is the 2nd time - first time they blew something out but this time it didn't help I have a diagnostic code of PO128 and PO171

by in Waterloo, IL on January 30, 2013
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1 answer
ANSWER by , January 30, 2013
maybe the blend door is not working