I did that in the Rockies once in late December, with a surprise white-out blizzard halfway up, so I cannot really call you crazy. On the other hand I always get nervous when people totally commit with such a light load. The margin for surprises is pretty thin. » 3/04/15 1:48pm Wednesday 1:48pm

Honestly, the heater is a literal no-brainer for any car with a combustion engine. You route air through some ducts that transfer heat from the engine block. That's just air cooling with some output routed through the passenger compartment. If a car runs the heater should work. » 3/03/15 7:47pm Tuesday 7:47pm