ac dead
 

Hi I just bought a 93 Trooper RS and I love it, but I need to fix the AC, there is no indicator light that comes when the AC dash button is pushed, So I tried to check the AC relays one at a time by using the foglight relay.But nothing has changed. I also checked the fuses they all look good, Should I assume the compressor is bad or is it possible it just needs a charge so the clutch will engage? Any help would be appreciated, Thanks

these models were notorious for the a/c push button switch failing