One of my pulleys were making a horrid griding or grounding noise when it was running. on occasion pending upon how hot it was outside, I would be able to smell it coming through the vents... I later found out that I could especially smell it when the AC was running... and I listend to it one day and heard that it was louder and made a squeaking noise when I ran the AC compressor... I bet you that its a pulley thats taking a dump... My AC compressor clutch and pulley assembly had to be replaced.
