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For what it's worth, my 20 year old (98') coolant tank developed "spider cracks" on the underside that were impossible to see when the tank was in the car.....but what would happen is, as the car warmed up the pressure in the tank builds up (totally normal) ..... as the pressure would build, the "spider cracks" would open up enough to (for lack of a better word) "weep". Eventually there would be enough weeping that a decent amount of coolant would collect under the trunk raised floorboards that the fluid would find it's way out a seam or hole and leak on my garage floor.
You might be having the same issue......mine was fixed with a new tank install (and $800 in parts and labor)
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