A couple of weeks ago I looked under the hood and noticed my coolant was low. Like, the entire expansion tank was dry. I filled it up, making a mental note to keep checking it.

Being a fairly lazy person, I then drove around and didn't worry about it. Three weeks or so of light intermittent driving later, I have steam puffing out from under the hood. This happened "all of a sudden," by which I mean it was not sort of puffing the day before and then ramping up, I mean there was no trace and then there was STEAM. This was after a brief cold snap for what it's worth.

Pop the hood and there is coolant spraying on my exhaust manifold. That much is clear. But oddly, I can't tell from WHERE it's spraying. There was so much steam, and I was with my two year old daughter and trying to a) not let her step out in traffic and b) not inhale a bunch of evaporating coolant. The stream was very very thin--needle-like--and discolored the top of my exhaust manifold a bit where it was evaporating. The temperature gauge didn't budge this whole time. Right on the N.

I limp home (temp gauge still solidly on N), let it cool, watch a bunch of water pump and head gasket videos on YouTube, and then fill it up again. Three days later and I CAN'T GET THE THING TO LEAK VISIBLY AGAIN.

I'd like some help with troubleshooting the system... I am pretty flummoxed given the fact that it was leaking right in front of me and I couldn't find the GD leak.

Ideas, critique, suggestions? Thanks to all.
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1980 242 B21F5 M45 "Inga'