Drove car home Friday eve after techs said "could not reproduce problem" with boiling fluids in tanks. Charged Level 1 for three hours, some boiling in both small white tanks under hood, and level of overflow tank in front went up to MAX. Turned off charger and went to bed, checked at 0630 Sat. Car all cool, coolant overflow tank down to MIN. Plugged in Level 1 charger for five hours or so. Came out, every tank and tube for fluid under hood was very hot, bubbling, and overflow tank was full up to the cap. Turned off charger, let car cool again.
At no time during these charging and boiling sessions was the A/C heater system ever on, or ever programmed to turn on at any time, either from car control panel or CARWINGS. At no time have I ever heard or seen or felt either fan in front of the motor be on. I do hear pump motor noise as a faint hum.
Called Service scheduler at dealer and he advised to have car trucked in again Monday, but his LEAF tech expert(s) (s?) would be absent until Wednsday.
I will drive car Sunday a bit, and drive to dealer (30 miles) on Monday. Purpose is to discharge battery down to point where it can be charged in dealer's presence at Level 1 for at least five hours. This is because that routine would duplicate what I do. None of this Level 2 charging for an hour or so and pronouncing "unable to reproduce" will satisfy my request for an adequate investigation of the problem, if any.
Possible next level of effort would be making a video recording of my situation.