My a/c pulley crapped on me. I killed my self to put in a new pulley, ,coil and clutch. It seemed to work fine for a few days. Now the damn thing will only cycle on for a few seconds. I figured it was tha air gap. I put a smaller shim in place, but that did not solve the problem. What the heck can it be now? Is there a site glass to check for refrigerant? Or is the only way to put gauges on it? I have gauges. Can someone run me through the process again? Thanks.