I found the coolant leak. I want to confirm that I need to replace the water pump. If yes, I will follow the guides.
http://forums.nicoclub.com/zerothread?id=220947
http://forums.nicoclub.com/zerothread/242595
[ame]http://www.youtube.com/watch?v=nDysgdtBzVA[/ame]
And about the rattling noise, is that the infamous timing-chain-hitting-the-guide noise?
http://www.nicoclub.com/articles.php?id=105618
Thanks!