2004 chevy trailblazer a/c?

[dodgeman2004]

I have a 2004 chevy trailblazer and the ac and the heat on work on controls #1,#2,#3,and #4 and when you turn it to number #5 it wont do nothing its like it shuts off no air what so ever.
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[wonderboy n]

common problem is the heater a/c control head