I have been chasing a whine and thought it was the tensioner pulley. I had two mechs check it out one said he couldn't figure it out the other said it's probably the tensioner pulley. I think it its the aircon compressor. The noise seems to be worst down low and from what I can tell is noisiest from the front of the engine. Question is why would an aircon compressor make a whine? It will be a $1000 job to have it replaced. Wondering if there is anything I can do myself or a mech can do cheaper than fitting a new unit.