AC Problem

Hello, We have a 1999 Chevy Venture, Starting today the rear a/c will not turn on, I have tried the dash switch and and the rear switches but no A/C or Heat, absolutely no air blowes out. I have check the fuses and everything looks fine and ideas?? I would appreciate and help. Thanks, David

I have a 98 and the rear motor was bad as well the the damper door swicth that flips from hot to cold. The motor cost about 120.00 online and was easy to replace. The control actuator was a bit tricky but can be done.