Well, it's not a matter of cold coaster or warm coaster it is mechanically speaking not possible.
It is the same with any mechanical object, if it's too cold it won't start/will take longer than usual to start. And Colossus being 11 years old isn't exactly modern, SAW because the lightness of the cars and the bulk of them are more prone to stalling as they are easily affected (and also in Saw's case the motor won't start)