Sorry that didn't help. I've not seen anything that similar. Apparently you're indicating you see the evidence under or in the vicinity of the evaporator core. First, are you positive it's a coolant leak (could it be condensation)? If it is coolant, maybe you could manually pressurize the system and be able to see where it's coming from. Leaks can do strange things...originate at one place, "crawl" along something and finally drip at a completely different location. Don't give up. Wish I had the magic answer.....