To clear everything up:
there are two seperate glycol based systems in the Nissan Leaf.
#1 HV cooling system. This is exactly as it sounds. Think ICE, but in place of the actual engine you have the traction motor, invertor, DC-DC convertor, on-board charger, etc.
There are two coolant pumps that are run in unision, albeit at different speeds (to prevent harmonics/NVH issues). Both pumps always run unless there is a pump failure, in which case the remaining pump is run at 100% duty cycle to prevent HV overtemperature conditions.
There is a traditional radiator, though it is a cross-flow style... and appears to be a triple pass unit!
The actual HV battery is air cooled.
#2 cabin heater system. This consists of a coolant pump and the actual "heater assembly". There is no heat exchanger (radiator) for the heating system.
Both systems have seperate swirl pots (burp tanks, call it what you like - with pressure caps), but share an overflow bottle.
Both systems use the "super dooper" new Nissan LLC - this is blue (not the old school green) and comes premixed in a 50/50 solution from Nissan. Both systems are claimed to be "lifetime" - worded proplery - maintanence free.
The A/C system is exactly like Altima Hybrid - uses a HV compressor and has a traditional system layout.
Hope that clears everything up!
there is absolutely no wire cooling of any sort in this vehicle. that is obsurd and i would mope around all day if i had to deal with diagnosing that nonsense!!