[pizza442]

Take a real close look at the plastic radiator tanks (on the sides of the radiator, not the overflow tank) for hairline cracks. Especially around the tranny cooling lines (and engine oil cooler lines on the passenger side tank, if so equipped). I smelled the coolant, too, with no dripping. Thought it was the water pump again, 'till I got a flashlight and stuck my head in there to see the evidence of seepage from a thin crack. Wouldn't drip when sitting. I think it expanded while the system was being pumped up at speed and the leakage occurred while moving.
It is my belief that a cracked rad. tank is the most common start which leads to the overheating that commonly causes the Northstar headgasket issue. Got my mom in her 1999 80k mile Caddy Concours Deville; rad. cracked, low coolant, overheat, dealer says one side headgasket bad. Check those radiator side tanks closely.