a non-energetic corps, @ ambient T° and no exothermic or endothermic effect = the wind won't lower the corps T°, and might increase it by air friction, depending the speed/pressure and surface type.
In other word, a BMW in the driveway since 24 h , @ -20°C drybuld, the engine block is @-20°C, even if the wind chill ''feels like'' -137°C.
back to topic :
According to my reading and experience, it seems like voltage variation more than anything else, for most people. I have this issue on a 13' 35i X3, this morning @-17°C drybuld. I had few weeks ago battery drain issue, and engine code related to low voltage at the JB+.
Someone can confirm, but BMW don't seem to rely on voltage only, but on amp also. According to the voltmeter I have 12.4V off, 14.4v ON, and the Genius tender saying its 100% charged, BUT I still have battery message, and drivetrain malfunction.
The issue seems to be the battery or the power module box, in most case. Which can be a good news, since its nothing permanent.
