Ninja leaks are the worst:\
Not that anyone would ever wish *for* a bad leak, but those little leaks that just leave a few drops here and there or during certain situations and just refuse to *show themselves* can sometimes be soooo much worse because you can't fix what you can't find...
Ugh...
Hopefully things will go well Saturday.
Only vague sort of thought that is coming to my mind based on little info and no verified facts...
If your weather has been like our's lately, swinging back and forth from very cold to fairly hot (very wide range, high 30's to mid 80's) then could the sporadic/random nature of the leak be related to heat related expansion?
That's the only thing that I can come up with right now that might explain how the car might randomly leak when it's just sitting in the driveway (not being started driven). Probably wouldn't make much sense if your weather/temperature has been fairly stable, but ours has been varying so much that it might be able to "mimic" the sort of cold/hot/cold expansion/contraction cycle that an average car's engine and coolant goes though when it's started/run/shut back down.
Seems like a very small leak (hairline crank in radiator, slightly cracked hose/loose fitting, less-than-perfect seal) might be able to do some hit-and-run leaking in that sort of situation.
Anyway, it was just a sort of obscure thought.
Vague random wiffs of a coolant smell when sitting inside/driving an X... Might, I hate to say it, actually be an indication of a second small leak since you've got coolant flowing around through plumbing going around everywhere in an X. Front/rear/under/though. But not much point in worrying about that until after the known leak is eliminated. Just mentioned it as a thought now, so if you get the leak up front fixed, then *if* there was still a smell indicating a second leak, it might not be such a nasty unexpected surprise. Anyway, with coolant smells, the *way* it smells can give a bit of an indication of it's origin.
Like antifreeze has it's basic cool/default smell which is tends to be present if there's some "pooling" going on somewhere, then there's the hot coolant smell, which tends to show up in cases where coolant is leaking/spraying when things get hot and expand or if coolant has previously pooled on/near a heat source, like on the engine or exhaust system, and finally the smell when coolant gets hot enough to burn or evaporate, which is very strong, can burn the eyes, and is pretty much limited to being around very strong heat sources, or high pressure situations. like coolant getting cooked on a manifold, or a pinhole leak in a hose which is basically turning to steam as soon as it escapes, and things like that.
Hopefully you only have the one leak, but if not, the particular scent might help give a clue to as to where to start looking if there's no obvious drips hitting the pavement.
Anyway, good luck sir, really hope the garage day gets you fixed up for a while