[ilikelife]

First, Make Sure The Charge Is Properly Done. And The Ambient Temperature Is Over 4 Degree.
Second, Check The Electrical Problem. The Z28 A/c Clutch Is Controled By The Pcm, When The A/c Swith Is On. The Pcm Close The A/c Relay, And Then Send 12v To The A/c Clutch. So Check The Relay And Make Sure The Current Flow To The Clutch When The Switch Is On. If Still Not, Check The Continousity Of The Wire. If It Is Good. Clutch Is Gone.
If After The A/c Switch Is On, No Signal From The Pcm To Engage The A/c Relay, Check The A/c System Pressure Sensor, Wot(wide Open Throttle)sensor And Ect( Engine Coolant Temperature) Signal To The Pcm. Those Signals Control The Engagement Of The A/c Relay. If They Are Good, Replace The Pcm
By The Way, Don't Forget To Check The Ground For The A/c Clutch, It Is Located On The Left Side Of The Engine.