I've read alot of posts about air conditioner clutches that will not pull in. I have the same problem on 2 98 Foresters. If you push in on the clutch with a broom handle it will engage and work fine until it cycles again. I did'nt want to take the clutch apart and remove a shim as some have suggested. I used some pb blaster ( same as wd40 only better) and using a nozzel sprayed some into the clutch behind the pulley. DO NOT SPRAY THE FRONT OF THE PULLEY WHERE THE CLUTCH PULLS IN. Inject it in the back between the pulley and compressor. I noticed alot of rust dust on the clutch and I think that lubricating the clutch helped it pull in better. It worked for me on 2 vehicles with the same problem.