Classic Saab 9-5 (1997 - 2009)
The 3.0tid has a 'when parked' and auxillary heater system. It can be run manually or on a timer so the car is warm and defrosted when you want it to be, at least in theory. In practice I haven't had much success with it and since it's not very well detailed in the manual, I'm not sure exactly...