Just bought a mustang, Changed the bad alternator and the ac compressor started smoking and went bad. Changed that and shortly thereafter I started to hear a sound it feels like is coming from the ac compressor area. Swapped the ac compressor for an AC Pulley and the sound went away then came back! When I’m in motion you cannot hear it as well as when you first start the car. But when idled at a light or in the driveway it comes after about 1Min 45 seconds. I’m thinking one of the bearings in the other pulleys May be bad.... Any suggestions on how to fix or where the sounds is coming from ?