What is the "Programer" in my CAR's AC unit? Apx how much does it cost to fix?

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I've spent a few bucks on routine maintance and up keep on my Bonneville in the last year, probably more than the car is worth. It's up to date on everything and all inspections. The A/C isn't working properly. I set the A/C to come out of the vent on the dash but it only comes out on defrost and floor. Please help... hot times on the way