Oh wow...I just noticed that LogicDesigner’s only interest on this board is electric cars.
Did Willie get a new hobby?
It does seem that LogicDesigner crawled away when he was proven wrong.
The website you mention, gm-volt.com, is not run by GM but is actually a fan-run site. They could still be correct, and if so I would be wrong about the battery cooling system coming on when unplugged. Here is what they say in one place:
What happens if the Volt is parked in the hot sun with ignition (power) off and NOT plugged in? This would be the scenario for many Arizona workers that park their cars in full sun on a black asphalt parking lot all day. How hot will the Volts battery get?
In order to determine, Volt was parked for a day in full sun. Results of this test are presented in figure 5. We see that the Volts battery is extremely well insulated. With cabin temperatures soaring to 115 F and ambient air temperatures going to 99 F the Volts battery only reached a maximum temperature of 90 F. Roughly equal to the upper limit during active thermal management during charging shown in figure 2 . We also note that there is NO ACTION taken by the TMS in this case.
Though elsewhere on the website people say that it will come on when unplugged if you have at least a certain amount of battery charge.
Regardless, that does not mean the manual says that you need to keep it plugged in when it is out in the sun. For the umpteenth time, it suggests it as a way to increase efficiency, not as something that is needed to prevent battery damage. (As the gm-volt.com post I quoted above indicates, even in 115 °F weather, the battery pack did not get over 90 °F.) Since you repeatedly conflate the text to say what you want it to say, and since you are invulnerable to correction, I'm not going to beat this dead horse any further. You can argue with thin air from here on out.
Regarding Willie Green, I had to look him up to see what you were talking about. I'm not too impressed with passenger trains myself. They are one of those things that sound good in theory but oftentimes don't work in the real world.