HELP: Coolant Leak!

[boyce89976]

2001 X5 4.4 with 158k on the clock.

Wife called earlier this week and said coolant light came on, but temp gauge was fine. Checked it when I got home, and expansion tank was almost empty. Refilled it, but still getting a leak from somewhere at the front, passenger side, of the engine. After shutting engine off, I have a puddle about the size of a dinner plate the next morning.

Also, there is a slight clunking noise coming from the front of the engine also. Can't see any obvious signs of where the leak is coming from. With engine running and expansion tank cap off, coolant is circulating with some pressure. At a loss here, any help would be appreciated.

Thanks,