FWIW, I did my first and only (personally started by me) SAE Combo DC (not so fast) charge yesterday on my Bolt. Even 19 to 21 kW DC charging at night (OAT below 70 F) is enoughto eventually trigger Bolt's thermal management, as I posted at http://mynissanleaf.com/viewtopic.php?p=559905#p559905
. The DC charger is one of those "24 kW" 55 amp chargers (says 350 to 460 volts, 55 amps on the label, at least posted on Plugshare).
Also, earlier that day when OAT was 100+ F, apparently, thermal management was triggered when I was driving.
Now that I know what it sounds like (very weird) I believe I triggered another Bolt's thermal management at work today when it plugging into L2. I was busy w/my car (at a problem station at work) and others so I had no time to go back before the noise got quieter.