NO A/C in my Jimmy

I have a 97 Jimmy and the AC clutch will not engage unless I bypass the relay switch and run a wire from the power and negative ports of where the relay should be. The relay switch works because I tried it in place of the blower moter relay and the blower motor continued to work. HELP!! It's hot here in HOTLANTA.

First check fuses and for a proper ac charge.
The compressor is also controlled by the vcm.
Any codes?

All fuses are OK and the compressor is fully charged. What is the vcm and where can I find it and how do I troubleshoot it?

What is your low and high side reading at idle and at 2K rpm when the compressor is jumped and running?
Any lights on ac control panel?
The AC controls supply 12 volts thew ac pressure switches to VCM
{your engine computer}
Then the VCM grounds the ac clutch relay to turn on ac compressor.
is the ac controls feeding 12 volts to pressure switches?
Does the relay have 12 volts key on power.
Is it getting a ground request signal {ground} from the VCM

Have you got a repair manual with the AC wiring diagram?
MT