[corvair69]

I have a 1999 Buick Regal LS equipped with the electronic climate control. When I try to use the A/C all I get is hot air from all the vents. The flow selection is working fine and will go all the way from Defrost to the Floor and all in between positions. The compressor clutch engages and the amount of R134a shows full on a gauge. What could be causing this problem? Any help would be appreciated.