Why won't the front AC vents blow but the back ones do? on 2005 GMC Envoy

When the AC is on the back vents will blow but the front vents will not blow at all

by in Rockport, TX on June 16, 2013
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1 answer
ANSWER by , June 17, 2013
poss blend door issue. scan a/c codes and post so we can adv. poss frt blower motor is bad also