I have a low-milage 83 turbo. When the A/C is on, I get a kind of dry, grinding noise that sounds like it is under the floor, but must be from the engine compartment. I see that there is a service bulletin 95057 June 1995 A/C compressor noise but don't know what the bulletin says or if it relates to the problem I'm having. Can anyone tell me what the deal is and, more importantly, what needs to be fixed (and will it be expensive?!).