Glad you told me that about checking the spark. I had a vague idea that checking spark the old way could get you in trouble with newer cars, but didn't quite know the details.

I saw no signs of leaking at the heater core. Maybe that white plastic case is sealed well enough to keep the coolant from leaking out? Or, maybe the leak is just enough to smell, but small enough that it gets evaporated off before it leaks?

Thanks,
Charley