2004 Chevrolet Monte Carlo Q&A

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

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 -
Answer 1
maybe the blend door is not working -
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