Last weekend I made a quick trip to the store, less than a mile away. When I pulled into the parking lot this loud, ear piercing screeching sound started coming out from under the hood. I opened the hood while the engine was still running and could hear the sound coming from one of the pulleys/wheels the surpantine belt rides on. I had a can of spray lube in my car and I doused all of the pulleys in the area where the bearings would be and the squealing stopped. I noticed all of the pulleys were still turning with the belt, so I know it wasn't the belt slipping on one of the pulleys causing the noise, it was a bearing. I was worried about driving the car from IL (where I work) to OH (where I live) as I know if the bearing seized, I'd be broke on the side of the road. I apparently got enough oil on the bad bearing to keep it from squealing or locking up. I dropped the car off at my mechanics's place this morning. My guess is a bad belt tensioner, but it could be one of the bearings on one of the other components that are driven by the surpantine belt. The belt turns 4 or 5 pulleys. At any rate, I'm glad I made it home, and the problem should be resolved today...