we have a G2500 series GMC van on which i recently had to replace a waterpump twice withing half a day. The reason was that i found that i had a leak dripping off of balancer. At first i though that i had messed up somewhere in gasket department, but them after carefully looking at a pump (after i cleaned it and dried it off lol), i saw that it leaks from literally a microscopic crack (defect). I swear ud look at the pump and will not see it but once its on it pushes green out of it like a blood would drip from a cut finger. That said, can a coolant come out from balancer seal area? everything is possible, depends on what u drive, what kind of construction does the cover have and how it interferes w/water pump.