If there is no pressure in the system the compressor will not kick on. Go down and buy a recharge kit ( make sure it has a guage ) or take it down and have it recharged. The problem with the Sadens for using them as an air compressor is that you have to rig a way to oil them unlike the yorks which have a reservoir.

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1982/1992 CYJ "FrankenJeep" SOA with Waggy Springs 1" body, 4.0 head, borla headers & cat back, mopar MPI, Jacobs ignition, York air, Custom 3" intake w/k&n, K5 heater, Flexlight fan, 33" Coopers, DANA 44's, lockright up front, NP 435...In progress.