I have a 2011 Subaru wrx premium sedan and the ac does not work. I went through the AC Self Diagnosis from the service manual to find that nothing seems to be wrong electrically... I think. The car will not tell the clutch to engage. I used a power probe to engage the clutch from the plug right on the compressor. I also replaced the a/c relay. I checked the valve and there's no pressure so I will for sure have to refill the Freon. However, I am nervous about the noise its making when I engage the clutch with the power probe. It's almost a buzzing noise, possibly a bad bearing maybe? Does this give any clues to anything else I might need to fix? I don't want to refill the Freon just to redo it all again.