I noticed coolant puddles from time to time right under the Harmonic Balancer. I figured out that it was leaking from the water pump and running down the harmonic balancer. I was told there's a weep hole built onto the water pump. When the bearing in the water pump are close to going bad then it will start leaking coolant from time to time out of the weep hole. So it's best to replace the water pump before it goes bad. I did mine myself. Take the fan off first. Take the serpentine belt off. Then take the pulley that's in the way of one of the bolts on the water pump off. Then take the plastic part that sits in front of the motor off (its held on by one bolt at the top). Then take the bolts off the water pump and put the new one on.