My a/c compressor locked up completely, so the belt is just grinding on the pulley and smoking / burning. I had it towed to a garage since I wasn't a fan of seeing smoke come out of my engine, and they gave me an estimate of $1200 ($800 parts, $400 labor) for a/c compressor replacement, belt replacement and recharge. I thought this was awfully stiff, seeing as you can buy compressors for much Speed Test cheaper than $800 online.