I got under the hood today because I noticed a coolant leak in the parking lot @ work today and when I got home I started investigating. I noticed the leak was coming from the top of the water pump to the right of the temp sensor. I started tightening all the bolts and noticed that one of the bolts had broken off somehow in the engine block (about 1" with the thread)was still there..... OH ****!!!!!!!!!!! I had replaced the water pump not 10k miles ago and was not looking forward to pulling all that crap out again to remove the broken piece of bolt.... I noticed a notch on the broken end of the bolt and decided to grind a smooth edge where it had broken to try to unscrew the piece. Low and Behold it worked!!! after some time and a few choice words and a magnet I got the piece out!!!! I'm so lucky that that was only a few hours gone and a bolt rather than 6 hrs and a lot more money!