Now that its ridiculously cold out (-14F commute this morning), I'm still really liking the coolant hack. It definitely allows me to get heat sooner in the car, and it also allows me to use the heat more aggressively. When it is this cold, its really nice to be able to sit at a light with warm air blasting you in the face, and your engine isn't running. However, I will note that you can tell that the heater air doesn't get as warm. Still, warm is better than the engine on, or no warm air. So, I am quite happy.
